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10-13-2014
I was just wondering if any one knows the idle re learn procedure for a 2006 pontiac grand prix base model (3800 series III engine). I've searched all over the internet for it and I cant get a definitive answer, so i thought I'd ask here. And the reason I ask is because i recently removed the throttle body in order to clean it and now I'm having a problem with delayed acceleration when I press the gas. so I'm thinking that the ECM didn't re learn the idle speed correctly. Thanks
10-13-2014
Tech 2 scanner or something similar like a modis, solous.
Only a scan tool can do a relearn.
10-13-2014
And if the warm idle is still around 700-800ish then it is working just fine. And if you hit the gas while in park and it comes back down right away and doesnt hang up for seconds at a time, then it's still working.
Perhaps just unplug the battery for 30min and see what happens.
10-14-2014
ok so i went into the store today to ask about getting a re learn done and they told me I would have to take it to the dealer in order to have the it done with one of their scan tools. they also said it might not be the idle speed, and that it could be that I messed up the tps when i was cleaning the throttle body. then i went to the dealer and they confirmed it did have to be one of their scan tools and it would cost $105 for them to do it. the guy there also said that if i drive the car for a while it may just do it on its own. and by the way the first guy said if i disconnect the battery and then find a place where i can drive a 40kmh for 5 km that would fix it too. what do you think?
10-15-2014
I wouldn't worry about having messed up the TPS, I've removed and cleaned my throttle body many times on my 05, opening and closing the flap with my hand and have never had a problem, and GM's service manual says itself to move the plate with your hand while cleaning.
As far as I'm aware, the throttle body and PCM should relearn automatically, but try this procedure I found on a w-body forum:
1. Reset ECM by pulling ECM fuse (underhood) for a few seconds.
2. With A/C turned off, start car and immediately put it in Drive with your foot on the brake.
3. If the car does not start initially, keep trying WITHOUT putting your foot on the accelerator.
4. Let the car idle in gear for at least 5 and no more than 7 minutes.
5. Shut off the car for 10 seconds.
6. Start engine, place in drive and let idle for 5 minutes.
7. Shut off engine.
8. Idle is learned.
Let me also mention that the 04-08 GP's, being that they have a drive-by-wire throttle body, have some delay or lag to them simply due to design. The signal from the accelerator pedal has to go to the PCM and then to the throttle body, which takes a split second. I've always had just a bit of delay to my throttle, and every drive-by-wire GP I've driven, so are you certain you just didn't notice it before because you weren't looking for it?
I personally wouldn't waste the money at the dealership either. The idle relearn (which I can't even find referenced in the service manual I have access to) is something you'd do if the vehicle was idling at an incorrect RPM range. It shouldn't have anything to do with throttle delay in my opinion. I flipped my upper motor mounts to rid myself of some of the perceivable delay, so maybe try that if you're interested. It just takes basic hand tools and some WD-40.
10-15-2014
So when you say with ac turned off do you mean switch to heat so the ac compressor/condenser is off cause i dont think there's any other way to do it.
10-16-2014
So i unplugged the battery for 30 mins and then took the car for a 25 minute drive and tried to maintain speed as much as possible throughout. Things seem to be fixed now. Thanks for the help. If anything changes I'll update the thread.
10-04-2016
so my 2006 Pontiac grand prix gt rpms hang up a bit before they drop, sometimes they even stick at 1000 and ride there for a while without my foot touching the accelerator
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