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post #1 of (permalink) Old 05-22-2019 Thread Starter
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Throttle body

I have a 2007 Impala with the 3.9L engine. I had a new throttle body installed. It is NOT from AC Delco. In any case, the problem I'm having is that the car idles at over 2,000 RPM when first started. The car was connected to a Snap On scanner and there does not seem to be a relearn option for the vehicle.


It was started, run for three minutes, turned off for 60 seconds, and started again. The car still idles over 2000 RPM.



I have also noticed that, when my foot is off the gas, that the car will go about 35-40 MPH on its own. The cruise control is NOT on. I have only driven the car a total of about 30 - 40 minutes with the new throttle body.


I have read online about driving the car above 44 MPH, doing sudden deceleration, and letting it idle for a long period of time. Frankly, I'm not sure what to do at this point.



When I put the car in gear it does not jerk or clunk. It shifts just fine.



The reason for replacing the throttle body was the check engine light was on and the car gave code P0121.



I wonder if I should drive the car for a longer amount of time to see if it will 'relearn' on its own or if I should take it to the dealer. I'd appreciate any feedback on this. Thank you.
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post #2 of (permalink) Old 05-23-2019
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Originally Posted by sinjin View Post
The reason for replacing the throttle body was the check engine light was on and the car gave code P0121.
Before you replaced the throttle body did you have the high idle? Or only after? I would try to trace the wires off the throttle body to see if they are frayed or damaged. I would also try disconnecting the battery for 30 min or so to make sure everything is fully reset. If it didn't have the high idle before you replaced the throttle body, I would put the old one back on if you still have it to see if it goes away. If it goes away, there is a problem with the new one...if it doesn't, you know you either damaged some wiring, or the problem is most likely unrelated. Something else you can check if you have a obdII scanner, is to look at the live data and see what throttle position the car is at. At idle it should be at zero (or very close to) I believe. Lastly, you could take the intake hose off of the throttle body, and have somebody rev the engine while looking at the throttle plate in the throttle body. Make sure if moves smoothly and returns all the way back to closed as it should. I would bet your high idle is caused by the throttle being partially open, but you need to figure out what is causing that to happen.
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post #3 of (permalink) Old 05-23-2019 Thread Starter
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Reuben,


Thank you for responding. I've read so much online about this issue and, frankly, don't know what the problem could be. Someone suggested removing the negative battery cable, pumping the brake pedal three times to drain any residual power, waiting a few minutes, reconnecting the cable, and starting the car. There was another suggestion of disconnecting both battery cables, as you mentioned, to see if that fixes the issue.



As Clint Eastwood once said, "A man's got to know his limitations." That said, I'm going to take the car to the dealer.

Last edited by sinjin; 05-23-2019 at 06:02 AM. Reason: more info
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post #4 of (permalink) Old 05-23-2019
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Originally Posted by sinjin View Post
As Clint Eastwood once said, "A man's got to know his limitations." That said, I'm going to take the car to the dealer.
Always best to know your limitations...thats for sure. Let us know what the dealer finds if you can.
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post #5 of (permalink) Old 05-28-2019 Thread Starter
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The dealer had to perform an ECM reprogram and idle relearn. That fixed it! The car runs as I'd expect.
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post #6 of (permalink) Old 05-28-2019
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Garage
Thanks for reporting back. Seems to be some mixed experiences from folks who have replaced throttle bodies as to whether or not they have required a relearn process.

My 6 year constantly asks why. What adults can learn from 5 and 6 year olds, to listen with your ears and mind open. Hard to learn when you don't listen ......
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