Low idle speed -Toyota/Lexus V6: Quick diag
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- เผยแพร่เมื่อ 5 ต.ค. 2024
- This old Lexus was in for a routine oil change... but it started funny afterwards and idled very low. No trouble codes set.
Time for a quick & accurate diagnosis!
Enjoy!
Another more in-depth video by ScannerDanner on this style of idle air control valve:
• Causes of low compress...
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I had a 98 camry that would not idle because of the idle control valve. Toyota said it could not be cleaned and quoted 250.00 to replace it. I pulled it out (I can't do any damage if it has to be replaced anyway) and the brass shaft had kicked a burr on the edge of the valve. Filed it smooth- no more problems. 1 week later my Chevy truck did the same thing (Chevy wanted the same price and said I could not clean it). Pulled it and cleaned out the gunk and worked fine! Thanks for the video.
We see those quite a bit at the dealership. I always use vice grips to remove the screws. They will be on super tight and will most likely strip out if you try to remove them with a Phillips. There is a magnetic washer behind it, so be careful not to lose it. Just pull it out and spray some throttle cleaner down the hole and work the valve back and forth by hand. You'll feel it sticking. I use brake cleaner to finish it off. Might as well clean the throttle while you're there. It will idle like crap for a few minutes afterwards, but it will smooth out. You might have to show it wide open throttle for it to settle down.
Those rotary IAC valves can be cleaned. Same valve on the Rav, really common when they stick. Quick diag is to remove the coil and spin the magnet a few times by hand this usually frees then up enough to warrant a closer look. Then it's brake clean (da dumm) and toothbrush! Nice video Ivan.
Hello Ivan. Yes I have seen these before. I'm sure you'll get the repair when she starts stalling or an erratic idle occurs. I enjoy your electrical portions from the lab scope and non communication issues. These to me are the ones that I deal with in my area. My country in Northwest Indiana has emission related repairs. Great job on your electrical repairs. Tell Eric O. The same.
Remove the two screws, pull off the coil, and clean the valve with solvent. I have used PB Blaster or WD-40. Just work the valve by hand until is is free. I have been successful with every attempt. I have never had to change parts.
+eldoradony Nice! I'm a bit scared of PB Blaster...that stuff dissolves rubber and plastic haha Maybe some Brake Cleaner? :)
+motoYam82 seafoam
Nice diagnostic Ivan and hopefully the customer will allow you to finish up the repair. Take care...
Ivan- my '88 Nissan Pulsar had the same type IAC. It's not a "flapper" (butterfly, vane) or a pintle. It is a "barrel" with a notch in it- that rotates in a cylinder, much like the rotor on a Wankel rotary engine. It uses a PWM bi-directional motor, to rapidly adjust airflow. Heat, gum, carbon and age blocks the travel, weakens the coil windings, and the response suffers. The only tests I know of is to apply voltage with the connector only, and try to manually rotate the barrel with a pick; it should be slightly humming when energized, and snap back to center (open) with KOEO. If I remember, 14 years ago, when I replaced it was around $100. RockAuto.com has two choice brands for this car, both at $122. Advise the Customer that "low RPM" issue is *very damaging* to the engine. Oil pressure, volume, and coolant flow are bad- and the battery will be in a constant state of discharge, taxing the alternator. A classic *cascade failure* is on it's way.
Sticky ISC valves can cause a no start because people forget to put there foot on the accelerator pedal just a bit.
Sure idles smooth at 500 RPM !
Hi Ivan, I hope all is well on your end. I have been looking for your videos but no luck. I don't get it but I love watching these videos. I do clock and vacuum repairs on the side so maybe it's the repair part of me that's loves this stuff. Thanks for the videos.
+craigsclocks Sit tight. There are some epic vids coming down the pipeline these next couple weeks :)
Like the quick style vids. Like the long ones too though👌🏻
Can't understand car owners who don't look after their cars. That issue will cause greater problems down the road.The IAC can be cleaned with carb cleaner and is no big deal.
you have to look at stft and ltft. wound not be suprised if a crack at the rubber hose between the maf and throttle body.
"...and cannot be cleaned." Well that sucks! Good vid!
Nice busting out the knockometer!
0:57 I feel like it should have stalled...
I would be afraid of too low oil pressure at that low engine rpm, specially with really cold oil. if the engine idles a long time it can't be healthy. It will surely sometimes stall too.
+Krzysztof S Actually oil pressure would be lower when it's hot! But yeah not good to let it idle that low for too long.
Battery will drain. No need to worry about oil pressure then.👍
Clean it. I had this issue today on a 2002 Sienna 3.0. Van wouldn’t stay running. Took off rubber air induction and sprayed throttle cleaner in IAC port and cleaned throttle body and van had new spunk.
Another pay me now or pay me later scenario. I am amazed it didn't stall at 0:58 though.
+Jon Rushing Yeah that V6 was butter smooth to below 400rpm!!
Yeah, yeah, yeah great job very informative content but, more importantly where did you get that sweet shop wall art aka pin up girl with the Honda trail 70, or mini-bike? Thanks
at the dealer we would try pulling the efi fuse to set back to base idle sometimes Toyota s act up after a battery change just FYI
Oh OK thanks for the tip! Definitely wasn't the case with this one...
What no engine swap? Didn't sma and etcg tell you that was theme of the week lol!
Bad idle air control valve solenoid = engine die at stop light, if not die just very low idle just clean the valve. Low idle can be leak fuel pressure regulater, clogged air filter, air duct loose connection from air filter to throttle body or weak fuel pump
nah ...I wont have you fix it.... I would rather idle with extremely low oil pressure and wear my engine out 10 times faster..and of coarse cause did charge to battery and fail any emission test LOL
Did customer do anything before the car started acting up?
My 1997 Toyota Camry was running fine before I cleaned the AIC and after I installed it back it started running same as the Lexus.
So I know the the AIC is clean and the throttle body is clean so I just turned up the idle speed on the throttle body.
That's a cool one Ivan. It would have been an easy fix but all well, you tried.
On my 2000 Lexus It does have a low RPM but it hesitates when I press the gas..then it kicks in..so looks like it jerks i do have the oxygen sensor on
I have a a 1991 Lexus ES 250 it's ideling high? What can be wrong with it. It only has 13,800 miles.
thanks, Hawkeye...
Thanks I have the same problem Toyota Sienna 2005 thanks so much
you can clean it.
Jahan from Learning Zone channel did it the right way on a corolla.
Just take a look at what he did.
Have a nice day.
Is there any way to eliminate the higher rpm when airco pump kicks in in a LS400 Lexus 1995?
Hopefully you didn't tell him what was the problem, so he can't go to Pep Girl and buy a ICV and replace it himself. Next time check the car and see if the ICV is replaced.
hi guys;
i have the same issue with my lexus GX470
there are no signs on the dash board!!
any idea how to solve it?
I have a bloody issue, 2zrfe 1.8 DOHC Low Idle after full warm up, STFT 1.6 / LTFT - 4.7, TB replaced, Battery replaced, spark plugs and coil packs replaced, fuel injectors replaced, all oem aka denso new and ECU reset and reprogrammed. I also replaced MAF and sprayed for vacuum leak with starter fluid n nothing. Even replaced evap solenoid and reset ecu by disconnecting both battery terminals n connecting only bat terminals to discharge and no success.
Whoa easy with the parts cannon! :P How low is the idle? What year? Does it have a throttle cable? I would start with a scanner, it should show you desired idle and TPS.
@@PineHollowAutoDiagnostics It doesn't have a Throttle cable. It has a digital wire. No TPS just a Throttle body and all electric. MAF. Yes I used a diagnostic tool. No codes. Just that it's running - 4 on the long term fuel trim.
I was wondering if there was an update to this. I have a Lexus ES 300 2002 model. It has been idling at around 250 to 500 RPMs for at least 10 years. I would like to have this solved as the car eventually has a low battery after idling for a long time with the air conditioner on. At no time has the car went dead or even exemplified misfire. No check engine light. I gave this car to my parents and sometimes she goes into a store and lets it sit with the air conditioner on for my dad for a really long time and I am concerned this will drain the battery in the future again. Is there a fix for the 2002 ES300? I heard that the IAC was not on the 2002 and 2003 models because of a modification. Also I saw a tsb several years ago but can no longer locate it.
Found this on a blog. Wondering if I am searching for something other than IAC.
I don't believe there is an idle air control valvefor cars that are fly by wire.
starting 2002 they moved from cable throttle to an electronic one I believe so there isn't a need for an IACV any more since they can control those functions via the new throttlebody.
I don't believe there is an idle air control valvefor cars that are fly by wire.
😢i have es 300 2002 with exact same idle. Steady byt low. Did you fis your lexus idle low?? What was solution?
Maybe clean the throttle body?
So i gather a 2000rpm cold start idle is normal for a Toyota 1MZ-FE ? In cold climate initially.
But about 30 seconds later the idle drops down to about 1100rpm whilst the engine is just starting to warm up. Then when driven back to the normal 700rpm idle +/- 50rpm and after restarting drops straight down to a normal idle.
Yup
@@PineHollowAutoDiagnostics I always thought it was annoying/abnormal. But i suppose the cold start idle warms up, provides better oil pressure/protection, etc very rapidly compared to some cars having a 1000rpm cold start idle 😄
@@PineHollowAutoDiagnostics But hey, i run 0w40 Mobil 1 full synthetic, in Australia it isn't cheap, but definitely worth it. Doesn't burn oil, but i like the better protection when hot. It's very close to a 30 weight hot, that's why i chose it, compared to other products being almost a 50 weight 🤣
By the book it can run 5w30, 10w30, 15w40 & 20w50 (both are too thick), so with improvements in oil tech, 5w40, etc are great alternatives. Or better still a 0w40 for even more protection on cold start !
Keep up the good work Ivan !, been following you for some time now
Think u need a bigger "diagnostic" hammer. it worked on my 98 camry.
i got a glance at the maf grams and it was at approximately 2.5grms. shouldnt it be higher?
Not at 500rpms lol
CayJam Auto Diagnostics
Mine was at 3.62 grams today at 710 rpms. 02 Sienna
Had the same problem with my mom's 96 camry...Very common problem with both Lexus and Toyotas. They can be cleaned, throttle body cleaner did the trick for me :) You can unbolt the electrical side to get access to the rotary, turn it back and forth to clear the dirt. Scannerdanner did one in this video th-cam.com/video/9c1YSic7ejs/w-d-xo.html
+Stanley Hill Oh yeah I forgot about that vid; just put the link in the description. Thanks!
Wells done buddy, finally got caught up, in the bush for 4 days . 😀
They can be cleaned with a carbon solvent like Forte Olefin Residue Cleaner, but this might not be available in the US.
IAC's are very expensive though. Look here Ivan; www.clublexus.com/forums/rx-1st-gen-1999-2003/358579-diy-iacv-clean-picture-write-up.html Good luck man.
At 4:02 on the video, you had it on the screen, but you breezed passed it and didn't say anything about it....
It says "Typical symptoms of poor IAC Control is cold start stalling or slow idle speed...."
Which, sounds like your symptoms....
Otherwise, great job as always.
And, the customer saying no, I mean, you are young. That probably drives you nuts. I hate to say it, but, the world will beat that out of you. Who knows why people do what they do... So, save the "care" for your own stuff.... On the job, the customer is the boss, and they're gonna do what they do, so, to save your stomach lining, let it go and move on to the next one....
Why the fuck does my 2012 Lexus 2is do this too💀
he is figuring it out as he goes. a normal person cannot follow this or understand it. skip it unless you are into care repair and using the ECM or scope on the engine.
??
Don't fix it. You'll get better fuel mileage!