Great video! I hadn't seen yours before tackling the job but as you say, it's really just a puzzle, so take your time, and don't feel rushed to "get 'er done". A few things to add to your great documentation: I marked all the hoses with yellow dots to ease my addled mind on reassembly. That hose on the back of the airbox, next to the last 12mm screw you removed on the right side is for the brake boost -- really important to remember to put that back on (ask me how I know--and I didn't mark it, so there you go!). For those 12mm screws on the left and right behind the airbox, I found a ratcheting combination wrench indispensable - those were the "key fiddle" on this whole operation. For removing/reinserting the plugs, lots of folks seem to have a challenge there, but a standard plug socket, with or without the rubber bushing, attached to a 3" extension, then sequentially adding a 6" extention once the socket was seated on the plug worked great. Removal for me was easiest by removing all the extensions and socket, and using a telescoping magnet to grab the plug. Lastly, I put a towel over the intake manifold to prevent anything dropping down those 6 gaping holes that seem to just shout "Feed Me!". When I do it again, I'll tape the wiper position on the windscreen to keep all the fit checking down to a dull roar. Great work--thanks for taking the time to document this!
Great hints re: marking the hoses, etc. Great comment all-around. However, you owe me an aspirin or two. Why? Because (and bear with me as I dispense some friendly advice to YOU, lol) my head aches from having to read through several lines of text... without ever seeing a proper... page... break. Anyway, just a helpful tip. Thanks buddy! 👍
More (I'm doing the plug change again today) - From a recent gremlin that appeared as we ran from the CZU Lighting Complex wildfires: check the connection of the PCV hoses. Replace them if they are too aged to seal well (the top one is the easiest and most likely to get jostled - it's under $35 OEM). If air gets into the system at this point, the "Check VSC" system indicator can activate, which can lead you down all sorts of rabbit holes. (If you have a OBDII scanner, it shows up as random engine misfires - on many cylinders). -If you are getting oil on the plug threads, which I just discovered, it causes similar misfiring issues, but fixed to a single cylinder. Regrettably, that involves removing the valve covers and changing the seals. So far, not many good videos on that process like this one. LASTLY Looking for torque values or exploded diagrams can be a real bugger with the Sienna. I found tsienna.net better than average for these (not much with the processes), and free. Alldata and TIS gives a lot of data but not much wisdom and there's a fee with them.
i saw this be done without removing the wiper cowl. it seems like a fuck ton of work to remove all that. i was wondering from your experience is it worth it to remove the cowl or can it be left on to get the IM off and get at the back spark plugs.
Toyota service shop wanted to charge me around $1K to replace the spark plug. Totally insane! I watched your video, followed your instructions, got it done. It took me about 6 hours to get it done, but it was worth it. I saved a lot of money doing it myself. Thanks for the video! 😊
I was going to change the spark plugs myself but after watching this video I decided to just take it to a mechanic shop. Thank you for saving me the headache!
Nice job great video. If van or any vehicle has close to or 100,000 miles I would change upper intake gaskets, fuel injectors, coils and plugs one and done. I would use dealership parts or the same company that makes the dealership parts. The goal take that cover off as little as possible. I done the plugs first to we just keep learning.
Amazing,thank you, just completed this weekend , took about 2.5 hours, i followed exactly except I also completely removed the hose from the top of the engine, I though it would be easier, ending up breaking the connection from the pcr valve, had to replace with Toyota part $70, no need to remove from the valve only the manifold connection. I purchased a ratcheting wrench for the back bracket 12mm from Home Depot, $8, made it a lot easier. When replacing the plug on the back near the driver side, remove the nut holding on the wiring harness, makes access easier. I did not end up removing the top bolt from the bracket at back of manifold, it came out with it on. Spark plugs $63, manifold gasket $26, throttle body gasket $6, all from advanced auto parts, total cost for parts incl hose $165, Toyota quoted $875, not including gaskets, so thank you so much. Just follow step by step, label the hoses and connection, I am not a mechanic, I normally only change oil and belts etc. this was the most complex task to date and went well, 2011 sienna, 138000 miles.
Absolutely Outstanding Job! My local dealer quoted $689. I spent 2 days during holiday vacation doing the job in my heated garage. I have the full shop manual set, but your video made the effort very easy to visualize and plan around. Worst part of the job, without a doubt, are the 12mm bolts on the passenger side intake plenum mounting bracket. It was heartbreaking to see that Toyota engineers ran that 1/4" A/C line exactly in this location and it costs you 1.5 inches or so of precious working room. I hate to say it, but it does seem like this was done to discourage (or penalize) people who like working on their cars versus sipping coffee and reading Forbes Magazine in the waiting room of their Toyota dealership ;) Anyway, I got er done, and greatly appreciate your video!
PLEASE READ BEFORE you attempt this job. Last weekend I followed the steps in this video to the letter, on my 2014 Sienna, until I got to the point when I start the engine to test it out. The engine starts then dies 2 seconds later. I spent 8+ hours trying everything I could think of to fix it. I removed back the manifold, checked all the plugs, checked the hoses multiple times, removed and cleaned the Mass Airflow Sensor, disconnected the battery for one hour, but got the same result. After a sleepless night (literally) searching the internet and checking forums, I found the cause: there are three electrical connectors that were disconnected before pivoting the metal trail, the one to the passenger side is connected to the fuel pump system. You need to connect that one before testing the engine. Now that I know it, I watched carefully the video once again and I could see that he connected it around 22:59 (it was fast-forwarded and he didn't mention anything about it) before starting the engine.
Licensed tech here - great video! I skipped through to get a rough idea what I was into while tuning up a 2018 Sienna 3.5L and 20 minutes later the spark plugs are sitting on my toolbox. Even beat the parts delivery guys. :) On the 2018's the only bolt at the back of the manifold is behind the throttle body. Unbolt the throttle body and move it out of the way without disconnecting anything. A 12mm headed bolt goes into the side of the manifold - the bracket stays attached to the cylinder head. So much easier than the older ones.
Thanks for the well-done video and close up view of the 12mm bolts on the back of the intake manifold. I completed this job at 154K miles in about 5 hours and would suggest replacing the manifold gasket, throttle body gasket and clean the throttle body. The dealer quoted $760 for this job and I replaced with original oem plugs for $72. Mahle and Fel Pro gaskets were another $20. Lots of things to disconnect so marking hoses is a good idea. The most difficult part of the job was remembering to connect that sensor with the heat sink located on the wiper assembly tray near the passenger strut. The car will start but stall in 5 seconds as posted below.
Wow, I figured $500, but not surprising for 760! Marking hoses is a very good idea. Even take pictures as your project progress as many pics possible, and dock tape with permermant ink maker 2 write the name of components and even mark an arrow 4 directon goes in. Excellent idea of replacing manifold n throttle body gaskets, plus clean throttle body with proper cleaning sparay. It is worth pain to SAVE bloody essensially 900 dollars to get net-pay 760. If you did not spend let just say 800, U saved 1600 dollars bascially! Once again, I have stated my comment that no good Toyota mini van designers deliverately make nearly impossible for vast majority of drivers or owners to FORCE or compel them to bring to dealer keep dealers alive, so that the dealers will keep order NEW CARS it is vicious cycle but that is what it is for economic cold blodded survival! Next time look for another van LIKE Chrysler see if they made much more easily maintainable... Even buying cargo van is not a bad idea and modify like passigner van with all the utility applications! Thz 4 Ur suggestions for changing gaskets, cleanings, etc. since I am there anyway. CA, USA
Just did this spark plug change last night on our 2011 Sienna with 129,000 on the plugs and when I was all done and have everything put back (except for that one sensor with heat sink) the car was not holding idle and dying. I assumed it was something to do with the lights or windshield and wouldn't have any effect on the motor... Wrong! Anyway this video was very helpful and saved us from spending the $690 the dealer quoted us.
Damn that's a helluva job for just changing six spark plugs - especially for the back three! You've got my respect for completing this task! I'm foreseeing that I'll just go to the shop for this job when I'm due to the spark plug change, as that’s way more than I’m willing to tackle for a weekend job.
Agree with you but with 1 scary thought. In the other video I watched, the mechanic mentioned that some people don't think it is necessary to replace 1 or 2 of the bolts BEHIND the intake manifold. That worries me because how would a customer know.............?
This is one of the best auto maintenance videos I've seen! Thanks for doing this. I'm looking to tackle this on my 2011 Sienna this weekend. Just can't see paying almost $700 which is the quote I received. Wish me luck! Thanks again.
After paying $1200 for my BMW sparkplugs and coils, $700 almost sounds tempting. Wife's 2012 Sienna is at 110k miles. Thankfully we just made it to Ny and back to Tx with no issues, but feel like it's time for some thorough engine and transmission maintenance. Shocks, brakes and tires are all new, so msy as well top it off.
Thank you, thank you! incredibly useful video. I was quoted between $370 and $800 for this job, I don't believe that the low end quote was a true quote. I finished the job over 1 and half days but some of that time was spent on purchasing tools, including a torque wrench. Another video I watched suggested torquing the intake manifold to engine and throttle body to manifold 14 foot pounds. I was careful with the torque for the throttle body to manifold since the bolts didn't seem to reach my 14 foot pounds torque. One issue I had when testing the engine caused the car to start and stop after 6 seconds. I didn't plug in the last connector on the cow which goes into the silver hot box. Make sure to do this when testing the engine or your engine won't start. Because the engine didn't start properly the first few times I received a check VSC system at dealership engine check error. I was able to reset the error by holding the traction button 3 sec, then start the engine while holding the button. This trick reset the VSC system error.
Now try to replace this van's transmission fluid filter- 2 of the many bolts holding the pan on are blocked by the frame. Odd how well engineered most of their vehicles are, but have these little sticking points.
had to have the manifold cover removed to solder the fuel injector wire that rats had chewed, a simple job that turned into a 500 dollar job due to Toyota imbecile design, trying to make simple things as difficult as possible to fix is their mantra I guess.
Thanks. Reminds me of a time I brought my car into a dealer for a complimentary maintenance service. I knew tire rotation was one of the things they were going to do, so I marked the position of a couple of the wheels. At pick up, the service manager said rotation was done. I check my marks, low and behold, wheel were in the same position...
Great video. After seeing this, I still don't have that kind of time to spare. I found a mechanic that'll do it for $300. I might have to go that route. Once again, great video.
Thank you very much for sharing. Well explained DIY. I placed a cover over intake openings to prevent anything from falling inside engine. . It took me 5 hours to do. You helped me save $900.00 Nicely done. 10-23-23
Thank you so much for all the instructions and details. I just replaced spark plugs on my Sienna (2011-140k) and took around 1 hour from start to finish!
Really, 1 hour? Why is everyone saying it is so extremely difficult? I do most my own mechanics, and sparkplugs have always been something that I don't even hesitate due to them being so EASY. However, so many saying it takes like half a day, ect. I have done water pumps, alternators, ball joints, cv axles, and even a clutch and rear main seal on a 99 Cummins 2500. Is this job really that hard? Or could it be that most attempting this haven't done much auto mechanics before?
Thank you sir!! I followed the video and was able to change my neighbors spark plugs in a 2013 Toyota Highlander Limited V6. I will suggest since you are already down this far is to replace the intake gaskets throttlebody gasket and clean the throttlebody masairflow sensors the car will run so much better and get so much better gas mileage Thanks !! 💯
I have the same year with over 380K miles and this van was brought brand new at the time, never had this done entire life and still drives very good. I don't plan to change it and probably drive it until it dies.
@@randomcar2190 These vans are built like tanks from Toyota, in fact the original battery lasted till 320K, alternator went out around 340k. Never once change the transmission fluid, I change oil and filter every 10k-15k myself.
I just did mine today. Not sure if the factory instructions tell you to remove the splash pan tray below the windshield, but it was not necessary- I had enough room to do all the work.. The key is having the right tools and patience.. A nice cool day helps too.. Took me about 2 hrs, taking my merry time..
I have a 2011 Honda Odyssey which takes about 20 minutes to replace all 6 spark plugs. Sister has a Sienna that needs plugs, not looking forward to this process. Great video. Thanks
Excellent camera quality and stillness. Great instructions, step by step! Thank you! The Toyota Sienna engine is basically a Lexus engine. So, this should be pretty much the same as Lexus -- maybe not the hybrid Lexus cars, but certainly the RX350. Tip: You can use a laser pointer to point to a part, e.g., a screw/bolt, from a distance.
Great video helped me alot...I got this done in 4 hours..the hose in the back of the manifold is easy to forget...I like how you gave the sizes to each bolt...great videos please keep posting more
I have the Toyota Sienna 2011 V6 too. Bought it new in Jan 8, 2011-just over 73000km in almost 8 years. If it is a few hundred dollars just for changing spark plugs, I will let the Toyota dealership to change spark plugs. The front 3 spark plugs that I can do, but 3 at the back seemed very challenging for me with no tools. I learned a lot from you. Just changed a new battery at Toyota after begging them do it for free and just paid for a battery and tax. I was there in front of it when they changed it out-it was easy, I wanted them to do it so I could give them the old battery and refund $18 for the old battery-I didn’t want to take the old battery home back and forth for 2 hours. Hope it will last another 5-7 years battery with 2 years full warranty and 84 months prorated deal. Since the van is getting old, I want to do as much as by myself instead of expensive maintenance at the dealership. Thank you for your videos.
Subscribed just because of the work you put into this! Not looking forward to doing this myself. Hopefully it won't take me as long now that I've seen how to do it. Thank you!
Very informative video. I am watching this because I am planning on buying 2015 plus Sienna. I have Toyota Prius V , right now and do most of the stuff myself, like, coolant, flush , break fluid flush, engine oil, break pads. I changed the spark plugs recently and it's almost as complicated as this one , the back three . I changed spark plugs on my first car, Jaguar S type , a decade ago and it was complicated as hell. I think on those cars where we have to take intake to access 3 spark plugs , is complicated design. I guess. I watched a video on changing engine oil on Sienna and it looked like walk in the park, when compared to changing oil on Toyota Prius V ( wagon ). Anyway, thanks for sharing, I subscribed.
just ordered all the spark plugs and intake manifold gaskets so I can do my wife's van. I hate when you have to remove the intake manifold to do half the spark plugs. Thanks for the video
Thanks for sharing. I just did my sienna plugs and cleaned the throttle body. I was very nervous to change the plugs til I watched your video. Took me about 2.5 hours. Straight forward. Just took some time.
Thank you so much for this video -- I love your style! I am doing this job this week and have been watching different videos for it: your video just excellent. Much thanks!
Great Job. Took me 6 hours, I had a mouse living under the engine cover, and he was making a cozy bed out of the firewall blanketing - so I took the time to remove the remaining firewall fiber material to discourage him from coming back. The only difference is that I did not have to remove the bracket, the intake came out without having to remove the bracket on the left side. I would have covered the intake area with rags once you removed the plastic intake. And I changed each plug, one at a time. Didn't want anything falling into the hole(s).
Wow, you are awesome for this! I can't believe you don't have more views. All of your Sienna videos are super informative. So many times I've backed out of repairs halfway through due to fear of need to apply too much pressure, bizarre fluid leaks, etc. These vids help get the job done with little fear. Thanks man!
Thank you for this video. It was a huge help. Appreciate you taking the time to do it. I was able to do it without removing wipers. After removing the top bolts and the Throttle Body, I removed the back passenger side bracket before removing the intake manifold. I removed the bottom bolt and then lifted the manifold to get to the top bolt on the bracket easier and removed it. I was able to remove the manifold pretty easy at that point without having to remove the wipers. A couple other things I found helpful when installing was putting the bolt on the top of the passenger side bracket in loosely and sliding manifold in place then maneuvering the bracket in proper position. I then recommend taking advantage of the ability to have the driver side bolt on the intake manifold loosely and sliding it in place as the bracket allows for that. I also put in the small bolts and hexes on top of manifold loosely. I then was able to more easily put the bottom bolt in place on the driver side bracket at that point. Once everything was in place I tightened everything down. The job was still a pain but much better thanks to you and the other comments here.
Awesome thank you so much so far this is the only TH-cam video I found that showed how to remove all the bolt and get the job done 👍👍👍👍👍 I’m planning to work on my 2015 highlander in the future less talk more work like it so much u definitely made the job look so easy wish u were my neighbor lol 😁
Woaaaaaoooooooooooooooooooooo this is to much job for spark plugs is crazy i prefer a old car you can seat inside engine and work. Good job man I have to bring my van to the shop to much for me. Thks anyway good video.
Samuel Florian I prefer the car I drive 10 years and 155k maintenance-free that starts and runs flawlessly while getting decent mileage, reduced emissions, and very good power per liter.
Thank you for the video very detailed and great. I would use OEM spark plugs. The store give you the wrong cross reference spark plugs you screw. With OEM you can side by side check the spark plug number it have to be identical.
Very nice video but kind of scary for a DIY person like me. I also just watched another video of a mechanic taking the Intake Manifold and replacing the back plugs WITHOUT removing the windshield wipers or anything like that at all ?? It all looks very complicated to me :) Thank you again.
Also I would recommend grabbing some brake clean. And while you have it apart clean the throttle body and clean the whole intake manifold it's full of carbon build up you know all the black stuff that robs your gas mileage!
Awesome job and thank you. I'd change the 3 coils in the back at the same time since it is so difficult to access it. Did you replace the intake manifold gasket?
Am in the market shopping for a Sienna. I had plugs changed on my Ford Windstar last month and now it appears to have running problems cropping up and the plug changing process was quite similar in that it is almost impossible to do correctly. May have to change my shopping plan to a Prius or Tesla because the mechanical process is so difficult. Another idea is to buy a low mileage Sienna and sell it just before a plug change is necessary.
Sir thank you for showing this to us. Can I kindly ask if where i can purchase the rachet extender you use? And also do you have the details tools you have use?
I'm curious how your van runs before and after the job or were you just following scheduled maintenance. I have a 2013 with almost 110,000mi very good 🎥 👍
Just talked to the Toyota Dealer near me...Changing just the plugs a little over 600.00. Change the coil packs like some suggest...over 1700.00! Using Oem doing just plugs 63.00 and doing it yourself with all the coil packs...644 with tax even using OEM. Take the day off and do it!
It would make sense to replace the ignition coils while you’re back there At the recommended 120,000 spark plug interval it would be good timing for those too
Quick question, after I replaced the spark plugs on my 2008 Toyota Sienna, I unplugged the throttle body and clean it, now the car won’t idle. It runs fine (not rough) for 5 seconds then turns off, do I need to reset the throttle body? Basically the car stalled after five seconds. Please help.
Hi David, I assume you used throttle body cleaner. You probably have the cleaner in your engine now. You will need to rev the engine a bit to pass it through the system. Also, make sure everything on your intake system is put together and sealed up. Any air leaks can make it difficult to idle. Hope this helps.
RandomCar I unplugged the throttle body completely. No fluids got in the engine. I did use the carburetor cleaner. I did also unplugged the electrical plug to the body.
I would guess that either there is a leak in your intake or a sensor is not plugged back in. Is there any check engine light? It can help narrow down the issue. Worse case scenario, you'll have to go through the whole process to find the miss...
I solved the problem, there was some kind of sensor near the top of the driver side front strut that I had disconnected. Not sure what it is but had a heat sink on it, it’s about 3 b 2 inches. Thanks for the advice though.
I completely removed the bracket on the passenger side, screw that, took me a hour to get that bolt out. Very good video. Just out of curiosity what's normal idle speed, I didnt check before hand, but I'm at 800 after, sounds good?
Interesting idea... I don't know. My GUESS is that you wouldn't be able to. There's not much space to tilt and you would probably need to tilt it pretty far.
awesome, Thanks sooooo much. Should i replace all the rear coil packs and the plugs. the van has 169K without any issue until today. the check engine light came and stay on. Felt some some hestitations/misfire on the way home but it got home fine without any issue. the coil pack is expensive. should i just replace the all the rear and the front spark plugs
OMG what a great video. Thinking about doing this myself, it looks really complicated. But what can i do. I wonder how much they'll charge for this job. Thanks a bunch man..
Like the video have a 2020 sienna guess when plugs get old I have done plugs on this engine without removing the windshield cowl just the intake it wasn’t on a sienna though guess I’ll check when time to
Good video I have a few questions.... did you use a resource/repair manual to do this or just figure it out as you went? My concern was your intake manifold gaskets, did you inspect before replacement, should they be replaced? Also as you worked I would also consider covering the intake ports, don't want anything falling in.
Hi Robert, I had to figure out as I went. Good question on the gaskets! They looked in good shape when I had it out. But, since you mention that, it wouldn't hurt to put in a fresh set. And I believe it is a cheap item to replace. Maybe $20-30? So, definitely worth doing while it is out. Thanks!
How dependable are the coil packs after 100,000 miles on a Sienna? I'm asking because I think it might be a good idea to go ahead and at least put new coil packs on the rear spark plugs while you have everything apart.
I think it would be good to change the coils while you're at it. My guess is that they won't last to 200k (the next plug change). I didn't change so I guess I will find out how long they'll last. ;)
That is seriously jacked up these car manufacturers make maintaining your car so difficult. Dang. Did any if the stuff removed (manifold) require new gaskets?
Thz n job well done indeed! Scm Toyota Sienna designers deliberately design that way to SAVE n KEEP dealers' Service department job and revenue flowing in. Unless you are mechanically inclined and have basic knowledge, the vast majority of people would not do what you just did! NO good scm asols Toyota designers of Sienna van, saying if you have money to buy and keep the minivan, you must pay to keep the car running! Likely 4 hours labor job translated to 400 dollars around and parts. Toyota dealer might charge at the lowest $400 to $500 for changing lousy spark plug when U can do Corolla in 20 minutes around! CA, USA
It seems in all the videos that I have seen, an error in naming the size of the cap screws (it is called bolt, when a nut is attached to it) is committed. The posters say "14mm bolt", or "12mm bolt". Those are wrench (head of the cap screw) size. Which is what the viewer needs to know of course in order to use a proper tool. Metric cap screws are designated for example as M10X1.50. Which is the diameter of the cap screw by the pitch. Wrench size is never indicated.
Great video! I hadn't seen yours before tackling the job but as you say, it's really just a puzzle, so take your time, and don't feel rushed to "get 'er done". A few things to add to your great documentation: I marked all the hoses with yellow dots to ease my addled mind on reassembly. That hose on the back of the airbox, next to the last 12mm screw you removed on the right side is for the brake boost -- really important to remember to put that back on (ask me how I know--and I didn't mark it, so there you go!). For those 12mm screws on the left and right behind the airbox, I found a ratcheting combination wrench indispensable - those were the "key fiddle" on this whole operation. For removing/reinserting the plugs, lots of folks seem to have a challenge there, but a standard plug socket, with or without the rubber bushing, attached to a 3" extension, then sequentially adding a 6" extention once the socket was seated on the plug worked great. Removal for me was easiest by removing all the extensions and socket, and using a telescoping magnet to grab the plug. Lastly, I put a towel over the intake manifold to prevent anything dropping down those 6 gaping holes that seem to just shout "Feed Me!". When I do it again, I'll tape the wiper position on the windscreen to keep all the fit checking down to a dull roar. Great work--thanks for taking the time to document this!
Great hints re: marking the hoses, etc. Great comment all-around. However, you owe me an aspirin or two. Why?
Because (and bear with me as I dispense some friendly advice to YOU, lol) my head aches from having to read through several lines of text... without ever seeing a proper...
page...
break.
Anyway, just a helpful tip. Thanks buddy! 👍
More (I'm doing the plug change again today)
- From a recent gremlin that appeared as we ran from the CZU Lighting Complex wildfires: check the connection of the PCV hoses. Replace them if they are too aged to seal well (the top one is the easiest and most likely to get jostled - it's under $35 OEM). If air gets into the system at this point, the "Check VSC" system indicator can activate, which can lead you down all sorts of rabbit holes. (If you have a OBDII scanner, it shows up as random engine misfires - on many cylinders).
-If you are getting oil on the plug threads, which I just discovered, it causes similar misfiring issues, but fixed to a single cylinder. Regrettably, that involves removing the valve covers and changing the seals. So far, not many good videos on that process like this one.
LASTLY Looking for torque values or exploded diagrams can be a real bugger with the Sienna. I found tsienna.net better than average for these (not much with the processes), and free. Alldata and TIS gives a lot of data but not much wisdom and there's a fee with them.
can you post a link to what a ratcheting combination wrench is? thanks.
i saw this be done without removing the wiper cowl. it seems like a fuck ton of work to remove all that. i was wondering from your experience is it worth it to remove the cowl or can it be left on to get the IM off and get at the back spark plugs.
Toyota service shop wanted to charge me around $1K to replace the spark plug. Totally insane! I watched your video, followed your instructions, got it done. It took me about 6 hours to get it done, but it was worth it. I saved a lot of money doing it myself. Thanks for the video! 😊
Holy moly 6 hours
Took me about that long too. Its mainly time spent figuring things out. It would probably take me half the time, next time I do this. 😀
I was going to change the spark plugs myself but after watching this video I decided to just take it to a mechanic shop. Thank you for saving me the headache!
Nice job great video. If van or any vehicle has close to or 100,000 miles I would change upper intake gaskets, fuel injectors, coils and plugs one and done. I would use dealership parts or the same company that makes the dealership parts. The goal take that cover off as little as possible. I done the plugs first to we just keep learning.
Amazing,thank you, just completed this weekend
, took about 2.5 hours, i followed exactly except I also completely removed the hose from the top of the engine, I though it would be easier, ending up breaking the connection from the pcr valve, had to replace with Toyota part $70, no need to remove from the valve only the manifold connection. I purchased a ratcheting wrench for the back bracket 12mm from Home Depot, $8, made it a lot easier. When replacing the plug on the back near the driver side, remove the nut holding on the wiring harness, makes access easier. I did not end up removing the top bolt from the bracket at back of manifold, it came out with it on. Spark plugs $63, manifold gasket $26, throttle body gasket $6, all from advanced auto parts, total cost for parts incl hose $165, Toyota quoted $875, not including gaskets, so thank you so much. Just follow step by step, label the hoses and connection, I am not a mechanic, I normally only change oil and belts etc. this was the most complex task to date and went well, 2011 sienna, 138000 miles.
Thanks, I wondering how long this would take and what parts I would need to buy in advance.
Curious how your van ran before and after the job.
Absolutely Outstanding Job! My local dealer quoted $689. I spent 2 days during holiday vacation doing the job in my heated garage. I have the full shop manual set, but your video made the effort very easy to visualize and plan around. Worst part of the job, without a doubt, are the 12mm bolts on the passenger side intake plenum mounting bracket. It was heartbreaking to see that Toyota engineers ran that 1/4" A/C line exactly in this location and it costs you 1.5 inches or so of precious working room. I hate to say it, but it does seem like this was done to discourage (or penalize) people who like working on their cars versus sipping coffee and reading Forbes Magazine in the waiting room of their Toyota dealership ;) Anyway, I got er done, and greatly appreciate your video!
😂😂😂
PLEASE READ BEFORE you attempt this job. Last weekend I followed the steps in this video to the letter, on my 2014 Sienna, until I got to the point when I start the engine to test it out. The engine starts then dies 2 seconds later. I spent 8+ hours trying everything I could think of to fix it. I removed back the manifold, checked all the plugs, checked the hoses multiple times, removed and cleaned the Mass Airflow Sensor, disconnected the battery for one hour, but got the same result. After a sleepless night (literally) searching the internet and checking forums, I found the cause: there are three electrical connectors that were disconnected before pivoting the metal trail, the one to the passenger side is connected to the fuel pump system. You need to connect that one before testing the engine. Now that I know it, I watched carefully the video once again and I could see that he connected it around 22:59 (it was fast-forwarded and he didn't mention anything about it) before starting the engine.
Excellent video. Followed it step by step. Installed my $35 spark plugs. Saved myself $600 at the mechanic. Thank you
Licensed tech here - great video!
I skipped through to get a rough idea what I was into while tuning up a 2018 Sienna 3.5L and 20 minutes later the spark plugs are sitting on my toolbox. Even beat the parts delivery guys. :)
On the 2018's the only bolt at the back of the manifold is behind the throttle body. Unbolt the throttle body and move it out of the way without disconnecting anything. A 12mm headed bolt goes into the side of the manifold - the bracket stays attached to the cylinder head. So much easier than the older ones.
Thanks for the well-done video and close up view of the 12mm bolts on the back of the intake manifold. I completed this job at 154K miles in about 5 hours and would suggest replacing the manifold gasket, throttle body gasket and clean the throttle body. The dealer quoted $760 for this job and I replaced with original oem plugs for $72. Mahle and Fel Pro gaskets were another $20. Lots of things to disconnect so marking hoses is a good idea. The most difficult part of the job was remembering to connect that sensor with the heat sink located on the wiper assembly tray near the passenger strut. The car will start but stall in 5 seconds as posted below.
Wow, I figured $500, but not surprising for 760! Marking hoses is a very good idea. Even take pictures as your project progress as many pics possible, and dock tape with permermant ink maker 2 write the name of components and even mark an arrow 4 directon goes in. Excellent idea of replacing manifold n throttle body gaskets, plus clean throttle body with proper cleaning sparay. It is worth pain to SAVE bloody essensially 900 dollars to get net-pay 760. If you did not spend let just say 800, U saved 1600 dollars bascially! Once again, I have stated my comment that no good Toyota mini van designers deliverately make nearly impossible for vast majority of drivers or owners to FORCE or compel them to bring to dealer keep dealers alive, so that the dealers will keep order NEW CARS it is vicious cycle but that is what it is for economic cold blodded survival! Next time look for another van LIKE Chrysler see if they made much more easily maintainable... Even buying cargo van is not a bad idea and modify like passigner van with all the utility applications! Thz 4 Ur suggestions for changing gaskets, cleanings, etc. since I am there anyway. CA, USA
Just did this spark plug change last night on our 2011 Sienna with 129,000 on the plugs and when I was all done and have everything put back (except for that one sensor with heat sink) the car was not holding idle and dying. I assumed it was something to do with the lights or windshield and wouldn't have any effect on the motor... Wrong! Anyway this video was very helpful and saved us from spending the $690 the dealer quoted us.
Any change you could post part numbers for the gaskets and spark plugs
Damn that's a helluva job for just changing six spark plugs - especially for the back three! You've got my respect for completing this task! I'm foreseeing that I'll just go to the shop for this job when I'm due to the spark plug change, as that’s way more than I’m willing to tackle for a weekend job.
Agree with you but with 1 scary thought. In the other video I watched, the mechanic mentioned that some people don't think it is necessary to replace 1 or 2 of the bolts BEHIND the intake manifold. That worries me because how would a customer know.............?
This is one of the best auto maintenance videos I've seen! Thanks for doing this. I'm looking to tackle this on my 2011 Sienna this weekend. Just can't see paying almost $700 which is the quote I received. Wish me luck! Thanks again.
I got the same quote from the dealership. They design these engines so you have to take them in to the dealership and get worked on.
After paying $1200 for my BMW sparkplugs and coils, $700 almost sounds tempting. Wife's 2012 Sienna is at 110k miles. Thankfully we just made it to Ny and back to Tx with no issues, but feel like it's time for some thorough engine and transmission maintenance. Shocks, brakes and tires are all new, so msy as well top it off.
My guess is that the BMW job is heavy on the cost of parts (mainly the coils), while the sienna is mainly the labor cost.
Thank you, thank you! incredibly useful video. I was quoted between $370 and $800 for this job, I don't believe that the low end quote was a true quote.
I finished the job over 1 and half days but some of that time was spent on purchasing tools, including a torque wrench. Another video I watched suggested torquing the intake manifold to engine and throttle body to manifold 14 foot pounds. I was careful with the torque for the throttle body to manifold since the bolts didn't seem to reach my 14 foot pounds torque. One issue I had when testing the engine caused the car to start and stop after 6 seconds. I didn't plug in the last connector on the cow which goes into the silver hot box. Make sure to do this when testing the engine or your engine won't start. Because the engine didn't start properly the first few times I received a check VSC system at dealership engine check error. I was able to reset the error by holding the traction button 3 sec, then start the engine while holding the button. This trick reset the VSC system error.
do you have to replace the manifold gasket?
Nice job, man. Giving it a go on mine this morning. Those rear plugs, though! Come on, Toyota!
Now try to replace this van's transmission fluid filter- 2 of the many bolts holding the pan on are blocked by the frame. Odd how well engineered most of their vehicles are, but have these little sticking points.
got to keep those Toyota maintenance guys working for 180 dollars an hour
had to have the manifold cover removed to solder the fuel injector wire that rats had chewed, a simple job that turned into a 500 dollar job due to Toyota imbecile design, trying to make simple things as difficult as possible to fix is their mantra I guess.
You’re a honest mechanic.some mechanic will not change the back plugs and they would charge you for it Goddess you
Thanks. Reminds me of a time I brought my car into a dealer for a complimentary maintenance service. I knew tire rotation was one of the things they were going to do, so I marked the position of a couple of the wheels. At pick up, the service manager said rotation was done. I check my marks, low and behold, wheel were in the same position...
Great video. After seeing this, I still don't have that kind of time to spare. I found a mechanic that'll do it for $300. I might have to go that route. Once again, great video.
Wow, this mechanic (aka: 'me') will do it for $225.
Thank you very much for sharing. Well explained DIY. I placed a cover over intake openings to prevent anything from falling inside engine. . It took me 5 hours to do. You helped me save $900.00 Nicely done. 10-23-23
Awesome walk through. Just did my 2013 Sienna. 4 painful hours but done. Thanks for the well done video.
Thanks! Glad it helped.
Thanks for this. Now I can see why the shop was going to charge so much. I may not get paid for my effort, but at least I'll be able to eat next week.
Thank you so much for all the instructions and details. I just replaced spark plugs on my Sienna (2011-140k) and took around 1 hour from start to finish!
Really, 1 hour? Why is everyone saying it is so extremely difficult? I do most my own mechanics, and sparkplugs have always been something that I don't even hesitate due to them being so EASY. However, so many saying it takes like half a day, ect. I have done water pumps, alternators, ball joints, cv axles, and even a clutch and rear main seal on a 99 Cummins 2500. Is this job really that hard? Or could it be that most attempting this haven't done much auto mechanics before?
Caleb M they probably have a 4 cylinder
Mustafa Toraman took me 2 hours tops. if you have the right tools super easy
It's not hard. Just time consuming.
Thank you sir!! I followed the video and was able to change my neighbors spark plugs in a 2013 Toyota Highlander Limited V6. I will suggest since you are already down this far is to replace the intake gaskets throttlebody gasket and clean the throttlebody masairflow sensors the car will run so much better and get so much better gas mileage Thanks !! 💯
I have the same year with over 380K miles and this van was brought brand new at the time, never had this done entire life and still drives very good. I don't plan to change it and probably drive it until it dies.
Wow! Definitely got your moneys-worth on the vehicle! Keep on rolling! :)
@@randomcar2190 These vans are built like tanks from Toyota, in fact the original battery lasted till 320K, alternator went out around 340k. Never once change the transmission fluid, I change oil and filter every 10k-15k myself.
Plugs have to be worn down to nothing. Will get better performance with new plugs.
good to know have you done any transmission fluid changes?
@@rodneysmith247Nope, still running as of now 470k miles.
I just did mine today. Not sure if the factory instructions tell you to remove the splash pan tray below the windshield, but it was not necessary- I had enough room to do all the work.. The key is having the right tools and patience.. A nice cool day helps too.. Took me about 2 hrs, taking my merry time..
thanks bro. totally answered my question. removing all wiper cowl looks to be a PITA!!!!
I have a 2011 Honda Odyssey which takes about 20 minutes to replace all 6 spark plugs. Sister has a Sienna that needs plugs, not looking forward to this process. Great video. Thanks
Excellent camera quality and stillness. Great instructions, step by step! Thank you! The Toyota Sienna engine is basically a Lexus engine. So, this should be pretty much the same as Lexus -- maybe not the hybrid Lexus cars, but certainly the RX350.
Tip: You can use a laser pointer to point to a part, e.g., a screw/bolt, from a distance.
Cool! Thanks for the tip!
Thanks for the video, I decided to take it to a shop. from your estimate time,3 to 4 hours I’m saving my money now.. great help.
Great video helped me alot...I got this done in 4 hours..the hose in the back of the manifold is easy to forget...I like how you gave the sizes to each bolt...great videos please keep posting more
I have the Toyota Sienna 2011 V6 too. Bought it new in Jan 8, 2011-just over 73000km in almost 8 years. If it is a few hundred dollars just for changing spark plugs, I will let the Toyota dealership to change spark plugs. The front 3 spark plugs that I can do, but 3 at the back seemed very challenging for me with no tools. I learned a lot from you. Just changed a new battery at Toyota after begging them do it for free and just paid for a battery and tax. I was there in front of it when they changed it out-it was easy, I wanted them to do it so I could give them the old battery and refund $18 for the old battery-I didn’t want to take the old battery home back and forth for 2 hours. Hope it will last another 5-7 years battery with 2 years full warranty and 84 months prorated deal. Since the van is getting old, I want to do as much as by myself instead of expensive maintenance at the dealership. Thank you for your videos.
This is an incredible tutorial. Literally saved my family hundreds.
Thanks! Glad it helped!
This video is a huge help and made my spark plug change go much smoother. Thanks!
Subscribed just because of the work you put into this! Not looking forward to doing this myself. Hopefully it won't take me as long now that I've seen how to do it. Thank you!
Very informative video. I am watching this because I am planning on buying 2015 plus Sienna. I have Toyota Prius V , right now and do most of the stuff myself, like, coolant, flush , break fluid flush, engine oil, break pads. I changed the spark plugs recently and it's almost as complicated as this one , the back three . I changed spark plugs on my first car, Jaguar S type , a decade ago and it was complicated as hell. I think on those cars where we have to take intake to access 3 spark plugs , is complicated design. I guess. I watched a video on changing engine oil on Sienna and it looked like walk in the park, when compared to changing oil on Toyota Prius V ( wagon ). Anyway, thanks for sharing, I subscribed.
I had heard that this is a rather involved project to do. Thanks to your video the process is much clearer now.
just ordered all the spark plugs and intake manifold gaskets so I can do my wife's van. I hate when you have to remove the intake manifold to do half the spark plugs. Thanks for the video
Thanks for sharing. I just did my sienna plugs and cleaned the throttle body. I was very nervous to change the plugs til I watched your video. Took me about 2.5 hours. Straight forward. Just took some time.
Thank you so much for this video -- I love your style! I am doing this job this week and have been watching different videos for it: your video just excellent. Much thanks!
More Sienna video please. I own the same car, it getting to the age that a lot of work need to be done.
Great Job. Took me 6 hours, I had a mouse living under the engine cover, and he was making a cozy bed out of the firewall blanketing - so I took the time to remove the remaining firewall fiber material to discourage him from coming back. The only difference is that I did not have to remove the bracket, the intake came out without having to remove the bracket on the left side. I would have covered the intake area with rags once you removed the plastic intake. And I changed each plug, one at a time. Didn't want anything falling into the hole(s).
Another good video to compliment this one. th-cam.com/video/ING-RK7NJ-c/w-d-xo.html
Thank you for the video. You've got a lot of patience. I think I'll save some money
for a professional mechanic to do mine. Lol
I totally understand!
Wow, you are awesome for this! I can't believe you don't have more views. All of your Sienna videos are super informative. So many times I've backed out of repairs halfway through due to fear of need to apply too much pressure, bizarre fluid leaks, etc. These vids help get the job done with little fear. Thanks man!
Thanks!
Nice work. Very thorough and well explained. Thank you for posting!
Great details, thank you for sharing this process. I'm motivated now and just ordered Sparks and a new manifold gasket.
Great video. Suggest replacing the manifold and TB gaskets since they are opened.
Thank you for this video. It was a huge help. Appreciate you taking the time to do it. I was able to do it without removing wipers. After removing the top bolts and the Throttle Body, I removed the back passenger side bracket before removing the intake manifold. I removed the bottom bolt and then lifted the manifold to get to the top bolt on the bracket easier and removed it. I was able to remove the manifold pretty easy at that point without having to remove the wipers.
A couple other things I found helpful when installing was putting the bolt on the top of the passenger side bracket in loosely and sliding manifold in place then maneuvering the bracket in proper position. I then recommend taking advantage of the ability to have the driver side bolt on the intake manifold loosely and sliding it in place as the bracket allows for that. I also put in the small bolts and hexes on top of manifold loosely. I then was able to more easily put the bottom bolt in place on the driver side bracket at that point. Once everything was in place I tightened everything down.
The job was still a pain but much better thanks to you and the other comments here.
Cool! Thanks for the tips!
Awesome thank you so much so far this is the only TH-cam video I found that showed how to remove all the bolt and get the job done 👍👍👍👍👍 I’m planning to work on my 2015 highlander in the future less talk more work like it so much u definitely made the job look so easy wish u were my neighbor lol 😁
Woaaaaaoooooooooooooooooooooo this is to much job for spark plugs is crazy i prefer a old car you can seat inside engine and work.
Good job man I have to bring my van to the shop to much for me. Thks anyway good video.
Samuel Florian I prefer the car I drive 10 years and 155k maintenance-free that starts and runs flawlessly while getting decent mileage, reduced emissions, and very good power per liter.
Kudos for this video, man. Extensive process and you detailed it carefully. Very grateful. Not going to do this but helpful to understand.
You should've covered the intake holes at 20:07 prior to continuing work.
Yea, I was waiting for him to drop a nut down one of them. If I was doing that job...I’m sure I’d accidentally drop something into those intakes!
Dude I love you man!!! Thanks for posting this!!!
Getting ready to do this and just found your video. Thank you! Great video!
WOW! Impressive, RandomCar! Great example of diligence and perseverance! Thank you!
Thanks!
Good video, this job can be done without removing the wipers or cowl. The intake will slide right out.
When i watched this i thought the same thing, didnt remove any if that, bout a 2hr job total
Do you know a video where they do it as you described ?
Thanks
@@Nicholas_gabriel look up TH-camr thunderboltuser, Toyota Sienna spark plug replacement 2013
Thanks for the great instructions and awesome video. I don't want to do this ever again 😟
Perfect this vid is what I was looking for!!!
Thank you! Your video was awesome and very thorough! Well done!
Thank you for the video very detailed and great. I would use OEM spark plugs. The store give you the wrong cross reference spark plugs you screw. With OEM you can side by side check the spark plug number it have to be identical.
Thanks. This video was very helpful. Just did mine. Runs great!
Better man than I Charlie Brown. Thanks fir showing me this.
Awesome video. Keep making more please. Great help!
Great video. Thanks for taking the time to put it together! Will be helpful when I do this later this week.
Very nice video but kind of scary for a DIY person like me. I also just watched another video of a mechanic taking the Intake Manifold and replacing the back plugs WITHOUT removing the windshield wipers or anything like that at all ?? It all looks very complicated to me :) Thank you again.
Thank you so much for this video you just saved me! It's going to be a lot of work but at least now I know how to do it thank you again 👍💯
Also I would recommend grabbing some brake clean. And while you have it apart clean the throttle body and clean the whole intake manifold it's full of carbon build up you know all the black stuff that robs your gas mileage!
Awesome job and thank you. I'd change the 3 coils in the back at the same time since it is so difficult to access it. Did you replace the intake manifold gasket?
Thanks! I didn't change the manifold gasket, but I recommend just doing it. It's cheap and you already opened up the thing anyway, so why not... :)
thanks so much for video . tool me 2 hour thanks again for video
Great job of teaching. Very informative.
Am in the market shopping for a Sienna. I had plugs changed on my Ford Windstar last month and now it appears to have running problems cropping up and the plug changing process was quite similar in that it is almost impossible to do correctly. May have to change my shopping plan to a Prius or Tesla because the mechanical process is so difficult. Another idea is to buy a low mileage Sienna and sell it just before a plug change is necessary.
great information on mechanics , and save a lots of money
Yeeeee í did my self took me 6 hours but i did it thks can't believe 10 min change the front and more than alf day do the back.
wish it were a lot simpler. .
Did u replace your TB gasket? Or use the old one? Wondering if we could leave the TB attached to Manifold..
EXCELLENT VIDEO AND EXPLANATION. THANK YOU.
Sir thank you for showing this to us. Can I kindly ask if where i can purchase the rachet extender you use? And also do you have the details tools you have use?
I'm curious how your van runs before and after the job or were you just following scheduled maintenance. I have a 2013 with almost 110,000mi very good 🎥 👍
I watched your vid all the way through, while muttering to myself 250 times, "Don't do it !", 'Don't do it !", ...
Changed spark plugs on a 4 cylinder 2011 Sienna. Thankfully except for pulling off that engine cover, nothing had to be disassembled.
Patience of Job sir!! That's one thing I hate about Siennas.
I sugest manifold should be cover to avoid dust or any other particle goes in and damage de cylinders
What you use the small fat handle screw driver for at the rear plugs?
Hi! I used the screwdriver to help push the tab to disconnect the coil from the harness.
Nice video! Have you needed replace the valve/head gasket on the same car?
I haven't, but this gets you most of the way there. 😉
Hey bro did you gap the plugs? Im about to change mine for the first time... the process is almost similar with my 08 civic with k20 engine..
It comes pre-gapped, but best to check. It's 0.044" for 2011 sienna.
Got you bro thanks a lot
Just talked to the Toyota Dealer near me...Changing just the plugs a little over 600.00. Change the coil packs like some suggest...over 1700.00! Using Oem doing just plugs 63.00 and doing it yourself with all the coil packs...644 with tax even using OEM. Take the day off and do it!
It would make sense to replace the ignition coils while you’re back there
At the recommended 120,000 spark plug interval it would be good timing for those too
Think I will wait untill Spring to do mine. Excellent video sir. Many thanks.
Quick question, after I replaced the spark plugs on my 2008 Toyota Sienna, I unplugged the throttle body and clean it, now the car won’t idle. It runs fine (not rough) for 5 seconds then turns off, do I need to reset the throttle body? Basically the car stalled after five seconds. Please help.
Hi David, I assume you used throttle body cleaner. You probably have the cleaner in your engine now. You will need to rev the engine a bit to pass it through the system.
Also, make sure everything on your intake system is put together and sealed up. Any air leaks can make it difficult to idle.
Hope this helps.
RandomCar I unplugged the throttle body completely. No fluids got in the engine. I did use the carburetor cleaner. I did also unplugged the electrical plug to the body.
I would guess that either there is a leak in your intake or a sensor is not plugged back in. Is there any check engine light? It can help narrow down the issue. Worse case scenario, you'll have to go through the whole process to find the miss...
I solved the problem, there was some kind of sensor near the top of the driver side front strut that I had disconnected. Not sure what it is but had a heat sink on it, it’s about 3 b 2 inches. Thanks for the advice though.
@@davidnguyen5028 Thanks for this comment. This solved my problem stalling problem as well. That sensor plug was easy to forget.
Do you have a video on how to fix the lifter noise on 2015 Toyota sienna? My car is making a tik tik noise
I completely removed the bracket on the passenger side, screw that, took me a hour to get that bolt out. Very good video. Just out of curiosity what's normal idle speed, I didnt check before hand, but I'm at 800 after, sounds good?
Will this motor tilt forward like a GM V-6 in order to get to those rear plugs?
Interesting idea... I don't know.
My GUESS is that you wouldn't be able to. There's not much space to tilt and you would probably need to tilt it pretty far.
awesome, Thanks sooooo much. Should i replace all the rear coil packs and the plugs. the van has 169K without any issue until today. the check engine light came and stay on. Felt some some hestitations/misfire on the way home but it got home fine without any issue. the coil pack is expensive. should i just replace the all the rear and the front spark plugs
Best to just replace the coils at that mileage. Unless, you don't mind doing it all again for coils...
check out rockauto.com for parts, and partsgeek.com
OMG what a great video. Thinking about doing this myself, it looks really complicated. But what can i do. I wonder how much they'll charge for this job. Thanks a bunch man..
That's alot of work... may as well just change the 2 front struts too, you already have them half way off.
Haha... yup! 😁
Like the video have a 2020 sienna guess when plugs get old I have done plugs on this engine without removing the windshield cowl just the intake it wasn’t on a sienna though guess I’ll check when time to
What an awesome design! 😂😂
Good video I have a few questions.... did you use a resource/repair manual to do this or just figure it out as you went? My concern was your intake manifold gaskets, did you inspect before replacement, should they be replaced? Also as you worked I would also consider covering the intake ports, don't want anything falling in.
Hi Robert,
I had to figure out as I went.
Good question on the gaskets! They looked in good shape when I had it out. But, since you mention that, it wouldn't hurt to put in a fresh set. And I believe it is a cheap item to replace. Maybe $20-30? So, definitely worth doing while it is out.
Thanks!
Great video. Thanks!
What an alsom design..😀 a questión bro? how much.we can charg 4 that labor? If you can answer i will appreciet. It.
I think people charge $300-400 just for labor. Depends where you live.
Thank you very much bro 🙏god beless you.🙏
How dependable are the coil packs after 100,000 miles on a Sienna? I'm asking because I think it might be a good idea to go ahead and at least put new coil packs on the rear spark plugs while you have everything apart.
I think it would be good to change the coils while you're at it. My guess is that they won't last to 200k (the next plug change). I didn't change so I guess I will find out how long they'll last. ;)
Did u put autolites in that toyota ? You might wanna change them,,,, always use dense or ngk amazon you can purchase from
Did you change any gaskets?
No, I didn't. But, probably best since it's all opened up already.
That is seriously jacked up these car manufacturers make maintaining your car so difficult. Dang. Did any if the stuff removed (manifold) require new gaskets?
I don't think it's required, but it is one of those things you might as well change while you're in there.
Thz n job well done indeed! Scm Toyota Sienna designers deliberately design that way to SAVE n KEEP dealers' Service department job and revenue flowing in. Unless you are mechanically inclined and have basic knowledge, the vast majority of people would not do what you just did! NO good scm asols Toyota designers of Sienna van, saying if you have money to buy and keep the minivan, you must pay to keep the car running! Likely 4 hours labor job translated to 400 dollars around and parts. Toyota dealer might charge at the lowest $400 to $500 for changing lousy spark plug when U can do Corolla in 20 minutes around! CA, USA
It seems in all the videos that I have seen, an error in naming the size of the cap screws (it is called bolt, when a nut is attached to it) is committed. The posters say "14mm bolt", or "12mm bolt". Those are wrench (head of the cap screw) size. Which is what the viewer needs to know of course in order to use a proper tool. Metric cap screws are designated for example as M10X1.50. Which is the diameter of the cap screw by the pitch. Wrench size is never indicated.