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Originally Posted by bigjerm25
i had a professional install my battery in my grand prix, well they forgot to plug up the sensor that goes into the airfilter, after i drove it i noticed the engine light came on, so i took it back to them and they plugged that sensor up.Now my engine is idiling funny and trys to die, is it possible that i need to unplug the battery so it will reset my computer and the problem will go away, the check engine light is not coming on now, but i really dont know what to do. it didnt do any of this till i got the new battery put in.
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Sounds like they weren't too professional. Its possible that it might clear up by itself after a few drive cycles. Just unplugging the battery negative or positive to re-set the ECU/PCM computer is a myth.
Here's the procedure I use:
Disconnect the positive battery cable from the post.
Turn ignition to the full start position and hold for approximately 1 minute. Of course the engine won't start. Then release to off position.
Your key will probably be stuck in the ignition at this point. No problem.
Now re-connect battery positive and tighten. You'll hear relays clicking.
Now turn key back to on and then back to off. Key will now remove.
Re-insert key and start engine and take it out for a drive cycle for the ECU to re-learn. It will re-reference to all vehicle sensors and establish
proper open and closed loop mode operation.
Hopefully the problem will correct itself. This procedure is the most comprehensive ECU reset short of using a odb-ii scanner/code reader with reset capability, etc. or a Tech II machine. Good luck!