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02-16-2017, 12:32 AM | #1 | |
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1994 Lumina 3.1 ECM replacement
Car has intermittent rough idle....runs great at faster speeds. Took it to our local Chevy dealer they diagnosed it as a "faulty ECM" and wanted over $500 to fix it. I can order a rebuilt ECM for slightly over $100.
Temped to try this but a few questions first: 1. Where exactly is the ECM? 2. The part indicates "The PROM[s]/CALPACK must be transferred from the original module to the replacement module." it looks like it just plugs into the replacement - correct? 3. Is there any reprogramming needed once replaced? Thanks in advance for your help. |
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02-16-2017, 06:57 AM | #2 | |
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Re: 1994 Lumina 3.1 ECM replacement
The PCM is in the RF corner of the engine compartment.
The MEMCAL is accessed through a cover on the side of the PCM. Be sure the PCM is not plugged in to the vehicle wire harnesses when exchanging the MEMCAL.
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02-16-2017, 08:23 PM | #3 | |
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Re: 1994 Lumina 3.1 ECM replacement
Thanks for the diagram. Is there any programming or re-programming that needs to be done once its replaced?
Thanks again. |
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02-16-2017, 10:13 PM | #4 | |
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Re: 1994 Lumina 3.1 ECM replacement
If your ECM has a transferable PROM/Memcal, then no further programming is needed...
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02-18-2017, 10:03 AM | #5 | |
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Re: 1994 Lumina 3.1 ECM replacement
Thank you. Very helpful!
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