Car not running in open loop? HELP ASAP! - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat

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Old 02-22-2008, 07:46 PM   #1
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Default Car not running in open loop? HELP ASAP!

I just took my 1993 in to a mechanic for an estimate. He said that the car is not running in open loop and because of a power failure the car needs to go through a relearning process. Could the culprit be a faulty sensor? They want $240 for a few more hours of testing and reprograming.
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Old 02-22-2008, 08:20 PM   #2
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When your car is running properly the PCM should be in closed loop. If it is running in open loop there probably is a faulty sensor. Try resetting PCM by disconnecting negative battery cable for a few minutes and reconnect. Drive car for a long drive and PCM will relearn all the sensors.
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