How to Change Subaru Spark Plugs (Easy)
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- เผยแพร่เมื่อ 10 ก.พ. 2025
- The maintenance that no one ever wants to do. Its really not too bad, In this video we change the Spark Plugs in my 2017 STI using 5 Tools. We are not jacking up the engine and the job can be completed in under and hour if you get the rhythm down.
NGK Iridium IX Spark Plug LFR7AIX # 2309 amzn.to/2sHOjpD
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Bro… this was the biggest pain in the ass right next to the AOS install 😂 but I got it done…. Thanks for giving me 4 quality hours of telling my kid to hold the flash light correctly. Core memories
Pretty much everything I’ve done on my STI other than oil changes, ive learned from you. Ive done a lot of mods and maintenance and ive had the car since new in 2018 so all that to say, you’ve been a huge help and I really appreciate everything you’ve taught me🤙 I was really dreading changing the plugs on my car but it wasn’t nearly as difficult as I was expecting. Mahalo and aloha from Maui Tanner.
Eyyy glad to hear I could be of service my friend and always here to help where I can 🥳
Literally been watching you for 1 year and did not know you had installs on EVERY FUCKING thing, awesome!!!
Good stuff , you made it look easy ! It took me like 3 hours as the plugs in the back took me an hour each to take out and put back in lol! But keep the videos up really appreciate these detailed videos.
Appreciate the support, after going through a lot of my past STIs I've tried so many methods to get them done easily and this was the best way I could do them.
Just got my first Subaru STI a couple weeks ago, and now I have successfully changed my spark plugs, thank you 🎉
Looked this up for my 16 STI after the hell i went through changing the plugs on an 05 LGT (and having to cut and replace two seized cross member nuts thanks to the motor lift method). This job was way easier on the STI thanks to your video. You my man, are a life saver.
Glad thr video helped and I know the struggles! 🙏🙏🙏
was dreading changing out the spark plugs but you honestly made it so simple, thanks for the video
Anytime 🥳 they're really not too bad
This video gave me the confidence to change my spark plugs in my 2019 base... took an hour and was super easy... just did the trans and diff fluid too. Also pretty easy. BigUPS
What did you use for oil? Motul?
@flabioarchan I used subaru spec 75W90 Extra S gear and transmission fluid. It's 76.04 for 5 quarts on Amazon
Super easy? Whatever...
@samkitty5894 what ya have issues with ? Just curious
Thanks for the video, something to note is that 18+ already comes with the colder 7 heat range plugs. I thought I was getting one step colder when in fact it was the same heat range as my stock 20 sti spark plugs. No biggy at least they are fresh new plugs. If you have swivel extensions it makes this even easier. I found that my craftsman kit you couldn’t get the ratchet head on the #4 cyl. The swivel extension allowed this to happen with ease. Only a couple battle scars, first time doing this took about 2 hours nothing crazy. I’m sure the dealer or any shop would of wanted crazy money for the job
Took 45 mins, my boss now wants me working on every Subaru that comes through the door 😑
Not too bad though, right? 😅
I’m in my 4th hour of this with over 6 people helping
Bro I did my tune up on my 02 WRX. Now all the Subi guys at my shop want me to “help”. At least he’s paying
Probably one of the hardest job I’m doing my wrench is stuck in the freakin engine bay
@@kimhaieung3215he says to loosen it halfway with the ratchet, remove the ratchet and do the rest by hand.. not that hard playa
I remember doing this when I had my STI! I was so hesitant on doing this job that I almost paid a mechanic over $400-$800 for this job. I was like f*** it, I’ll just do this myself. What I thought was gonna be a all-nighter job, me and my buddy did it in less than an hour thanks to this video! 😂
Exactly what I needed...posted 3 years ago, but still relevant! Just going over maintenance, plugs came up in another one of your videos and I thought, damn I need to do it! This video helped guide me a lot and as always, very informative. Saved me about $350-400 in labor charges and DAM back to 1.0 babbbby! Unless disconnecting the battery reset it?! Either way, peace of mind! Congrats on 100k+ subs, well deserved!!!
Other than my father, I’ve never loved another man more than you…
I love your video skills and amazing information that you provide. You’re definitely my go-to whenever I have Subaru questions.
❤😘
Thanks for the great video! Just finished doing my plugs in a record time of...3 1/2 hours 😂😅😅
Not too bad! How the hands feel? Lol
@@Smeedia hands are slightly sore not gonna lie.. worst was I dropped the extension behind the motor on cylinder for so after putting it back together had to go fishing 😂
did mine on a 2010 forester xt, I raised it up with quickjacks, pulled one plastic cover off underneath the front, the plugs are right in front of you!, Still not too easy of a job, you'll need all the tools!
On the NGK site it says to not use anti-seize or lubricant on NGK spark plugs, apparently it can be detrimental. Just wondering if you’ve ever read that anywhere or had any issues due to adding anti-seize? I didn’t think it’d be an issue but just wanted to ask after reading that on NGK’s site
yea he use wayyyy mucho too much
This was a very good video. Super informative. One thing to take away from this video is to make sure u always lube up. Especially if u r trying to insert it in a tight dark hole half blind. ;)
🤣🤣🤣 never go in dry 🤣🤣🤣
Nope. Just use the Force and drive it home
Lol don’t use anti-seize on your plugs otherwise the advice is spot on.
@@anthonyr5869why not?
Good job! You make it seem super easy!
Thanks dude! Not too bad of a job to knock out!
Seeing this car before the eg swap is a throwback..
Thanks man for the info on the plugs to buy I got my plugs changed. Shamefully it took 4 hours cause the back coil back on driver side would not line up with plug. Car runs alot better subaru had the gab on plugs little below .20 and it's a new car
That back coil pack can always be a pain, but glad you got it in and running smooth 😁😁😁
Attempted to do this earlier today after changing my oil. Basically gave up after taking the stock intake system out and removing the front passenger side coil pack. Didn’t help Ive been dealing w/ major lower back pain. I ended up buttoning everything up and hating my car. Lol what a day.
Sorry to hear, some shops don't charge too much but on thr bright aide you got the oil knocked out 😁
Smeedia oh I haven’t given up yet. I looked like an 80 yr old man walking around tho lol. Still not sure how u are able to get to the plugs w/ out a swivel, at least on the passenger side since I hadn’t got that far the other day.
Its all about the angles 😅
Don’t use anti seize on ngk plugs. The lubricant from it could cause you to overtorque the plugs cause them to break and that’s a major issue. The treads on the plugs have a corrosion compound already.
slightly overtorqing the spark plug isn't going to break it or strip the threads. A little anti-sieze is not needed on NGK but it's not going to destroy your damn engine. Chill
@@nastysoda9212 yeah keep saying that buddy. Not many people know what a 1/4 in turn is past sharp rise in torque. Seen it happen that why you follow instructions lol
Can tell your Subaru gets tons of TLC, thanks for the info! Doing this next week.
About to do this over the holiday weekend and dug this up for a refresher. I think peeps that jack up the engine and other silliness are not aware of the socket disassembly and coil pack spin techniques. I had to figure out the spin one when I brute forced the packs in there and got wild misfires and blinking cels. That moment when you try to fix something and you make it 10 times worse. 😭
But, lots of people worried about spark plug part #'s. It's in your owner's manual. There are actually a few different ones that go in EJs. My 205 and 255 are different.
Its not nearly as bad as people make it out to be, you get a technique and a groove down after a while. The 2309 NGKs have always been a solid bet for me 🔥
You just saved me money. a shop was going to charge me 300$
Glad I could help! It's not too bad of a job to do at home 😁
That's ridiculous haha tell them go to hell
Im trying to find your video about removing items needed to get to the spark plugs. Im working on a 2006 Baja Turbo.
Thank you
Did it personal record time of 1hr 30 minutes thanks to your video! That cylinder 4 is a b!?(#. Make sure you get a ratchet that does not lock into the extension. Didn’t realize you can hate a tool that much. Thanks for the video!
Not bad time! When it locks in place I have to pry them apart with a flat head to get then apart to get the ratchet out 🤣
I've been wondering what plugs i need, i run e85/98 mix running 350whp in my ej207, i took out the old plugs and it was hks m40i plugs and i was wondering can i run ngk lfr7aix plugs or do i need to buy the same plugs i took out?
Hi.. im new to the wrx community.. thanks for the videos.. very helpful.. my wrx is starting to Stutter in 3rd gear. Not happy right now.
This is becoming my go to channel .
Good work man
Thank you 🙌🔥
“Rotate 180 degrees, unplug it, and pull up and out”
Mine doesn’t even rotate? And unplug what, the wire? I’m just confused cause You left yours in??
Please explain.
Wow wish I would’ve watched this before doing mine haha got my driver front in but gave up after struggling on the driver rear for an hour and a half
Not too bad once you get the right technique down 🔥🙏
Im a yr behind ya but bought the spark plugs today. Great video
🙏🙏🙏
Doing my 17 wrx next weekend glad I came across this 🙌🏻🙌🏻
Hope it helps! 😁😁
@@Smeedia hell yeah bro I started watching you before I even got my subie lmao
People be telling changing spark plug was hard on a EJ and I always thought it was hard until one day I tried it and wow it was not hard at all: just a couple of unscrews and that’s it . Well my car is a 06 sti
It's really not bad, I thought the same thing up until I did my first set and it was a breeze. Hawkeyes are my fav generation.
Thanks so much for the vids. I have a 2018 WRX STI. will you please send links to the vids showing accessory removal? I've just started working on my car and i'm looking for some good guides.
I thought my 06 STI was a pain in the ass to change the plugs on. Then I bought a 2015 Ecoboost Ford Escape as my new daily driver, and was amazed at the plug removal process, and how annoying it is. At least on the Subie you don't have to remove the cowling, wipers, and other crap top reach the number 4 plug.
You have to remove that much to get to the plugs?!
I want to take off my battery but idk cause I went somewhere and said if I just unhook the batterythe system will forget things but wouldn't it just relearn idle speed and stuff in a couple weeks of use anyways? They said I need to put a 12v charger in the obd port to keep the memory intact 🤷🏽♂️
NGK advises against using anti-seize on their plugs
I'm aware. But after having one of NGKs plugs crank inside the head and cause porcelain to go everywhere I prefer using the anti size method.
@@Smeedia Could that have been from over tightening? www.jagrepair.com/images/AutoRepairPhotos/NGK_TB-0630111antisieze.pdf
No idea, the owner prior to me had installed them on the car. There was some corrosion on the threads when they came out
It’s not to bad once you do it multiple times. Hardest part is having an extension to short or long and getting stuck on the strut tower 😂
Big thing to remember if you unplug all your coil packs. Just remember black to back. Or your going to have a bad time.
Good point, totally forgot to mention that. You wont have a good time if you get them mixed up
I learned the hard way.
@@SuperMuddybuddy hopefully nothing that couldn't be undone by swapping them back.
Just a bit of a panic. Have you seen the wholes in the frame of the Subaru accent with tiny steel plates tack welded over them? Perfect in line with the spark plug holes. Was thinking about drilling those holes to make changing spark plugs easier. You could turn your wheel an access them with a long extension through the rim.
@@SuperMuddybuddy it's not a bad idea to do that, I would worry about the rails rusting after drilling into them though. I mean painting them would solve the rusting issue but I like the idea!
Pregapped at .032, is that still a good gap for FBO built motor on e85? Thanks, very much appreciated video!
Another great video! Got the 2309 plugs didn't gap em.
3 -4 -5 gears at 3000 to 4000 rpms car jerks pretty bad no check engine light tho any thoughts?
Whats the car 👀
You make it all seem so easy.
Can you please supply a list all the tools needed? In order to change coils, and spark plugs.
Also thank you for this video.
There's a list in the video but
10mm 1/4 socket
1/4 Rachet
Spark plug socket
3/8 rachet
2" extention
Flat head screw driver 😁
Its not too bad once you get it going 🔥
I’m about to be doing this tonight. I asked the dealership how much and they quoted me 980$ yeaahhh…no…I also have 60k miles on mine, will I potentially feel any performance change?
Just did my spark plugs, took about a solid 2 hours to do, lost a 10mm in the process 😪. Also, my swivel spark plug socket definitely made things a whole lot easier.
What happened to the 10?! I've never liked the swivels when doing plugs, always feels like its going to strip the plugs 😅
@@Smeedia The 10 popped off my ratchet after I finished tightening the coils back on. Guess I'll have to take my splash shield off to retrieve it.
I've made the same mistake before and have lost multiple sockets 🙃
Just helped the roommie do his GR8 I believe it is. Apparently hes never done them and Ive never done it on my GRF. Before buying mine I heard about jacking the engine a bit however I think it was more with the GC and GD as the engine bay is smaller than the GR and the VA looks a bit more spacious than the GR. Took about 5 hours (including piping and accessories) mostly trying to find the hole and the air pressure of the coil kept wanting to pop off until we got the bolt in. 180 trick didnt work on the GR. Otherwise same process.
I can not get the second coil pack out. I tried everything and it seems to be too close to come out.
Going to change spark plugs soon on my 19 sti. How do you feel on the ruthenium plugs? Supposedly they're better than iridium.
I'm going to have to use ( get them comfy ) as my perfessional recommendation from now on 😅
Just gotta get em nice and comfy in there 😅🔥
Damn. Your engine looks so clean! I'm in Vermont, and dirt, salt, and dust get everywhere. Just royally effed up, and mistaked the cvt transmission plug as the oil plug. Fun, fun... Check engine light came on too, and it has one code, indicating "multiple misfires". Thinking spark plugs? I've been dreading the change, but found this video and now have some hope. WTF is up with Subaru tho? It's not very user friendly. I'm use to adding transmission fluid from the top, not these side plugs. And the location of the spark plugs?! Damn! They REALLY want you going back to the dealer, I guess...
Thr plugs aren't too bad once you've got a rythem down for them 🙏
Subaru use to have fill plugs up top but mived away from them around 2008 or so to the side fill 😮💨
Thanks man nice vid was scared to do mine until I watched your vid.
It's not too bad to so once you get going 😁🙏
Smeedia yea thats true now on to the nostrum hpfp
Love your content bro, I have a 13 wrx & was curious if I can install the same exact spark plugs you did? Or are the NGK 2309s for the newer year models only?
Yessir same same plugs 🤝
Awesome✋ I put those in idles fine but I’m getting a pfffe code that doesn’t tell me what exactly is going on and all the lights come on and flash on the dash after cold start idle. Any thoughts what that could be?
I figured it out 🫢I installed a master brake cylinder brace same day as the spark plugs had to remove my Grimmspeed top mount intercooler to help with access and didn’t tighten the throttle body hose down all the way 🤦♂️
Are the spark plugs congruent to where they are on the WRX as well? Thx for your vids btw man, they’re very helpful and you’re pretty damn thorough about the topics you discuss.
Thanks for the feedback and support! And yes they the same with the WRX 🙌
Thank you very helpful.
Nice video bro, I look at this spark plugs Amazon and says it won’t fin on your car, any suggestions, drive a 2018 STI on stage 1+ thanks man
Same spark plugs 🤝
Ngk 2309s
@@Smeedia thanks bro 😎
13 wrx hatch cranks but doesn't start after putting plugs in. I got fuel and air. I torqued them to spec.. what could it be?
Coil packs plugged in?.👀
Thanks for the reply, seems like the maf pooped on me. It'll run when it's unplugged and not when plugged. Got one from subaru waiting on pick up.
Thank you for the vid. I'm noticing that alot of 14MM magnetic spark plug sockets on the market are 12pt while the hex on a 2017 WRX spark plug is 6pt. Are you using a 12pt or 6pt 14mm spark plug socket to remove/install the 6pt hex spark plugs? Thank you.
Don't ever put never cease on your spark plugs if you have to use that you're over tightening them you're going to end up stripping the threads out of the block
Tried to figure out dm...About to take mine in to Subaru due to HOA/ laziness but I’d be down to float that $$$ for some local assistance and actually see what’s up😅 thanks for all the content regardless!
If I had the time I'd knock it out 😭
14 sti here .. I've already ordered the oem Subaru plugs bfore I found your video 🤦🏻♂️.. should I order the ngk or just install the oem for now ?.. thanks man good channel 👍🏼
You can definitely still use the OEMs if your running more boost I would swap to the 2309s 🙏
I know this is an older video but would yall still recommend these plugs or is their another ngk plug I should choose?
Is it the same process for a 18 wrx?
Hey Tanner, are these plugs good for a stock 21 sti, or should i just go oem from Subaru. It's crazy how much more expensive oem are than the 1 step colder.
I know you own a brz but the technical instructions on the frs specify jacking the engine out of the cradle to which I definitely do. Haven’t done plugs on my wrx yet but I know on the frs I can’t physically get my bear claws for hands in the tight space haha
When i did them on the BRZ I had to jack up the engine, impossible to get them out otherwise from what I've tried 😅 thankfully on the STI I don't need to
Smeedia
Well if there is enough space like on an outback I’ll be happy. I don’t work on Subaru’s very often, last time I did the connector retaining tab broke like on a Toyota and ended up falling out
I've seen that happen on older models farther frequently, hopefully does not happen to ya
Hi Smeedia, I own an Impreza Model 2017 and wanted to replace the plugs, while was not able to find the Original => NGK DILKAR7B8, but somthing that should work => SILZKAR7B11. The only difference between them is in the Gap, the original is 0.032 while in the replacement it's 0.044.
Does this matters? What are the implications for using the replacement?
Thanks for the advice!
You can just change the gap on thr plug to match and you'll ve good 💪
Hey man great video. So to conclude there's no need for a torque wrench? Just finger tight and 1/2 turn should be good?
Just good N snug is 🤙 I've never torqued them 🔥
@@Smeedia just wondering in case my plugs are seized up because they haven't been changed for long, can I spray some penetrating spray into the chamber ?
Yes you can, I wouldent do a crazy amount though
Thx Mate, this helped allot. Good presentation :-))
Glad to hear it helped 🥳
Any video about timing belt? I have an 08 sti hatch. Thanks 🤙🏼
None yet but I've got it added to the question have to find a car that needs it done 😅
@@Smeedia You want to change the belt on mine? I'm in Washington too
😉
Gap? Bought some NGK SILFR6A's, stock plugs, what ive read online says they should be gapped to 0.03, but they're at 0.025
What do you figure is the best coil pack to run in 2012 WRX sti Hatchback? I Thank You for your video it made the job super simple.
Oem 🤝
Do I need to worry about pre gaping the spark plugs I buy from the dealership or are they good to go in the engine ?
What’s the best way to get a step by step on what to move out of the way beforehand and be able to do this on my WRX? It’s my first time working on this car and no one I know how’s to work on a car like this (fiancé won’t even touch it since it’s JDM) so I’m trying to figure out how to do everything properly so I don’t screw up my daily driver. 😬Some guidance would be awesome.
Not sure where you can find a step by step but you'll need to remove thr battery, intake and secondary air pump. Not too terrible.
The air pump is 3 12mm bolts 🙏
What about the vb would it be similar process?
I watched this video among others as a guide but should have done more research. It wasn't until after I installed them that I found some important information from my tuner (cobb-verified Innovative Tuning). He (and many internet sources) recommend avoiding anti-seize to deter misfire from improper grounding. I have to take all my spark plugs out now and clean off the lube.
Personally I wouldent put any in without anti sieze. I have had plugs break inside the head from cording to the block and its not a good time to remove pieces of plug from the head. Never seen a misfire issue either but if you are pulling them to clean it off I hope it goes smoothly and sorry for the mis representation for it.
Could you tell me the size of the extension lol! That’s definitely not a 1 inch I got a 1 inch and it dosnt come out far enough
3" 🙏
@@Smeedia thank you 🙏🙏
Recommend these for a 18 STI stock turbo, just intake and downpipe?
What’s up man, love your videos. Just curious have you ever changed the gapping and if so, why? I know the NGK 2309 one step colder plugs are pre gapped at .032 but curious to know if some pro tune shops have there own gap specs.
Sometimes, on high HP builds I'll gal them down to .028
@@Smeedia that’s what I thought. Thanks a lot man. 👍🏼👍🏼👊🏼
Coil pack doesnt want to ge back in there after i change the sparks .? Any idea
thanks great video, can I ask about the coolant radiator in your car?
It was a mishimoto X line but i would highly suggest the Koyo 😁
@@Smeedia thanks bro
Hey man I’ve heard a lot of people say don’t put anti seize on the sparks. Apparently ngk stated that themselves cuz there’s already a coating on the plugs. I just wanna make sure I’m not putting it on if not supposed to lol
Some people do and some don't, I've had a set of NGKs oxidize to the head and break. Ever since then I've always used anti sieze
@@Smeedia cool man thank you
Part # or replacement for ignition coil 2014 wrx
signs u need new ones? my car doesnt have any lights on but the car feels a bit sluggish not sure if maybe its the spark plugs, car has like 28k miles
Pretty sure NGK says don’t use anti-seize but none the less it’s not to bad to do these I did mine yesterday.
Few years back I had one corroded to the head (also lived somewhere very humid) ive always used anti sieze with 0 issues. Ran it on my 630WHP among many others.
but you are correct NGK says to not do it.
Cylinder 4 spark plug hole is now cross threaded. Great.
Do the spark plugs you use for your STI work for the WRX as well? I have a 2017 and when I clicked the link the spark plugs it had said it didn’t fit but I’m assuming that is just on Amazon’s part haha.
Diffrent part number,
subimods.com/products/ngk-iridium-spark-plug-set-stock-heat-2015-2019-wrx-2014-2016-forester-xt?variant=41169119740079¤cy=USD&gclid=Cj0KCQjwjN-SBhCkARIsACsrBz46YcVEbfybVnwQ9ql-niLSXEdI5djobpfCx0zY2UzBj4RkjINdfJAaAvaAEALw_wcB
I was looking at replacing my spark plugs in my STI and was under my car. Have you ever looked at taking the plugs out from under the car it seemed that there was nothing in the way from the bottom of the car?
I've tried from under the car and it's much worse 🙃 this method is the easiest way I have found it do it
I tried doing my Forester XT from above, but could not get to them and found I could only get to them from underneath.
Would you recommend going 1 step colder plugs for daily drivers with standard FBO mods and tune?
You the man. I let Frank's Irvine Subaru do all my maintenance in Irvine CA. A great video for turning wrenches. I love your videos brother. What are your thoughts on the new FA motors coming to the WRX and the STI.
Don't have too many thoughts on them yet because subaru haven't really released any info but keeping an eye out on them 👀
@@SmeediaI gotcha. I can't wait to find out more information about them. Great videos brother. I just subscribed to your channel so I'm looking @older videos but I'm impressed man. Great information For everyone out there in our community man. Keep up the great work.
I used to go there until they fired the best service advisor.
Service manager Sebastian is a douche bag.
@@THEbig9er oh wow. Sebastian has been good to me. All of them, libda,clemente,noe. Sorry to hear Sebastian was bad to you.
@@THEbig9er what are your thoughts on this new FA 24 motor for the WRX and the STI? There gas to be a reason Subaru only gave the new WRX a 3hp bump.
On my EJ25 ratchet a wobble short extension and spark plug socket that’s all I use nothing else
Are those spark plugs good for stock power on the STI
What would be the recommended spark plug gap for a fully built sti with an fp blue turbo and full bolt ons? I can run e85 or pump but on pump gas I make 400whp and peak boost is like 20-22 psi
Do you have any videos showing how to remove the parts around the spark plugs?
I do not, the only things that need to be removed are the battery, secondary air pump and intake, in the spark plug video I point out where the bolts are for the pump. The battery is just 2 10mm bolts to remove that one.
I love your Subaru content
Appreciate the support!
Dumb question, but how much are you tightening them when you install? Thanks for the content, trying to maintain my 16 STi in Portland, OR
Once they're hand tight I go 90* past
@@Smeedia thanks! Looking to do my first spark plugs if you couldn’t tell 😅
Are the spark plugs on an '17 impreza located in the same location as the WRX?
Yes it is the same 🙏
@@Smeedia thank you
I have a 2007 Forester XT and it took me two hours to get one plug out just to find it still looked like new at 40k miles.
Very healthy engine if it came out lookong brand new!
For a stock sti do you think 60k is fine for spark plugs or do 30 just in case??
Hmm..you must have a good feel for the torque specs on those plugs without using a torque wrench. I have a 2016 STI this will make it easier to get those plugs done when it's time to get'er done.
Never have owned a small enough torque wrench to fit in there lol 😅
Just finished swapping my plugs I think everything went smoothly...one Q for you - the fuel pump sounded weird when I initially got the battery back in and went to start the engine. I took the key out of ignition and re-primed the pump and it sounded normal again. Ever have that happen?
Stock fuel pump or aftermarket?
@@Smeedia stock pump I always run 93 no e85 or anything
My 17 did it for a while Here and there when it had the stock fuel system but nothing detrimental ever happened from it
@@Smeedia Cool..I'll keep my eye on it for now, about to go cold start the car and see what happens after sitting overnight