I am really having a PCM problem, HELP! - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 02-07-2003, 03:48 PM   #11
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OK. Last night I received my eprom from gmpartsdirect. I disconnected neg batt term. Installed chip, started vehicle and what do I get 10min later? That'* right a C/E light. Probally reading the QDM code 640 again. Now what? How bout an O2 sensor I am so confused now.
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Old 02-07-2003, 04:44 PM   #12
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I think we're on the right track. This is a really frustrating one. I'd be wondering about the PCM itself, not just the chip at this point. Shotgunning that would be far more expensive than a full parameter scan. You need a professional to look at this before you spend any more money. The chip was a good first step, but that'* alot more cost effective than anything else it might be.

Get a FULL scan.
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Old 02-07-2003, 05:31 PM   #13
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I just ordered a O2 frm GMpartsdirect.com out of frustration and bec I have 77,500 miles. Yes when the c/e light is on I feel a slight restraint at WOT but thats it. I had it scanned. The guy at the shop has 1 of those $2000.00 red scanners w diff cartridges, etc. I forget the brand name but he drove the car around with it hooked up and it told everything like the vehicle temp, rpms etc. What does the QDM do anyway?
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Old 02-07-2003, 05:50 PM   #14
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What'* the website for granprix owners? Buddy here at work just bought one. Back to the topic: The mechanic was only able to say that the QDM was in the ECM. He was driving. When I told him I replaced the ECM he said maybe I replaced it with another bad one. But what'* the chances of replacing with a unit that has the same xact problem?
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Old 02-09-2003, 10:25 PM   #15
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Ok. Let'* say for the sake of argument that yes I did buy another bad PCM with the same problem as the last. If I buy another from let'* say gmpartsdirect, is it a returnable part if this doesn't fix my problem? :(
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