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I just finally got my CEL off after replacing a open circuit Oil Control Valve for my VVT. Was running great, I decided might be a good Idea to clean the MAF sensor and Throttle Body. When I first start the car it will take a moment to return to a correct Idle, around 800 rpm. However the second you touch the throttle it will not return back to idle, it will stay at about 1500 rpm. Ive tried the idle relearn process and it hasnt worked, tried disconnecting the battery which did not work, it popped a p0507 at once point for the Idle Speed higher than desired… well yeah lolo. Im going nuts about this, I dont understand how cleaning my throttle body would cause me a high idle that will not relearn, any Ideas guys?
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I’m not picturing how that assembly looks but if it’s got the IAC built-in or attached I’d bet the IAC got some contamination in it from cleaning the TB causing it to malfunction. Some of those don’t like being cleaned. That or something isn’t making good electrical contact.
I was thinking toward what you just said, but as far as I can tell it appears that the Idle speed is controlled by the throttle plate itself, if im wrong please tell me, maybe I could remove the TB and clean the IAC if it has one
If it’s ‘drive by wire’ you may be right, they may just control idle at the throttle plate.
In that case I wonder if the cleaning fluid removed whatever lube they use and is causing the TB shaft to stick slightly? Not sure how you would test for that because, IIRC, they tell you not to force the TB open by hand.
I know we have some GM Techs on here that will be more familiar with that particular setup.Heres a link that may help with the idle relearn procedure. yours was #4C8-)
http://www.google.com/url?sa=t&rct=j&q= … yxKKYOgH3Q
already performed that, was talking with a guy I work with, hooked up the Tech II and the throttle just ignores the relearn command, wires look good, signals look good, however its almost like its missing a ground, yes its a 5v ref but with it plugged in we werent expecting to see 5.01v on body refs all the time, normally its around 4.8v. As far as we can tell its gonna need the throttle body… go figure, try to do my car some good and it bites me in the ass. knew i should of bought a ford lol….. as of right now its giving me a constant eng power reduced message… so wounderfull. Might go try a junk yard throttle body.
according to these forum sites. alot of people are saying the dealer can reflash your ecu and it seems to solve
the idle issue.might be cheaper than a new tb.C8-)I’d like the say that would fix it, but all leads are pointing towards the tb and now its a hard circuit fault… Im gonna hope someone in the area actually has one on stock. Ill update whats going on, also gonna see about having the ecu reflashed anyway cause im sure the calibration is way out of date.
If you are certain that cleaning the TB created your problem, there’s nothing wrong with getting one from a salvage yard. Should save you some bucks. Good luck man, and keep us posted, because I want to know the fix.
It’s a bit late to mention this but I don’t recommend cleaning throttle bodies on drive by wire systems and I NEVER recommend removing a throttle body to clean it.
That said you may very well have a hard fault at the throttle body however I think it’s worth a shot to have the computer reflashed to see if that corrects the problem, after all what do you have to loose?
most will open KOEO if you floor the accelerator pedal. Which is what I should of done, but yeah I hear what you’re saying, all I wanted to do was try to smooth my idle on cold starts a touch. (not that it was that bad, just didnt seem right) Well…. ironically I got a clean throttle now… :-/ wish I just would of left well enough alone… Uhhhh being stupid and young lol….
found a dealer that had one, so I bought it, installed it in their parking lot lol, and sent it back in to their shop to have the idle learn done and update the ECU. Drove 178 miles in Limp Mode… not fun lol. I needed to be out that way anyway for plans me and the girl had made.But long story short the new TB fixed it. Now I had cleaned it myself and damaged it somehow, screwed up the sensors, so I was gonna eat the money on it, after an hour of it in their shop they came out and gave me a refund on the TB saying it was warranty, I never told them what happened to it, just that I had replaced it cause of a problem with it. So I got really lucky in this situation. Now Im with Eric here… Im not gonna ever clean a fly by wire set up again… NOT WORTH IT!!! lol…. As for the car, idles great now.
the reflash would not have work on the old TB? sounds like you got lucky. thanks for the update
and the fix.C8-)no unfortunetly. And honestly I dont even think they ever reflashed my ecu, just reset the idle learn. The old TB had a circuit fault, guess the cleaner found its way into the potentiometers and cooked em. Lesson learned, dont clean Electronic Throttle Bodies
Sometimes you don’t have a choice – you get a buildup around the throttle plate and may cause the accelerator to stick 1st thing in the morning, it may set a code or have idle problems.
What I have done is spray the cleaner on a shop rag, then use the rag to clean the throttle plate and barrel – and on drive-by-wire units take care not to force the plate open too much. Not sure if you can make them open by doing KOEO and stepping on the accelerator, but I doubt it.
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