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Old 12-05-2008, 02:02 PM
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4 chevys and a ford
 
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GM 4.3L computer switch_99 to 01?

Can I install a 1999 s-10 pcm into my 2001 1500 express.
Both have the 4.3L engine. Neither are california vehicles.
The engines appear almost identical. I have already swapped
the crankshaft sensors and that worked.

Thanks
Brian
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Old 12-05-2008, 04:22 PM
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I would doubt it. Go to Autozones web site and look up the part numbers.
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Old 12-06-2008, 02:26 AM
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I think they would swap however I know there's a security issue that needs to be re-programmed.
Ran into this on a 2000 blazer.
Why do you need to swap?
~Scott
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Old 12-13-2008, 08:59 AM
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I should have actually looked before posting this question.
The computers are totally different.

I'm trying to pinpoint the cause of a misfire reading. It seems like a false reading.The computer is reading severe misfire, but the van runs PERFECT.
I get almost 20 mpg's. There is no elevated HC's. No one has been able to
pinpoint the problem, including the chevy dealer. The CKP sensor was replaced.Then I switched CKP sensors from my s-10 to the van. No help-same problem.I have good compression, and the fuel system seem to be running correctly.

I had a revelation last night. The crank sensor did go out last year, causing
severe misfiring and detonation. I had to drive the van some miles in that state. I am now wondering if the catalytic converter melted causing some exhaust restriction. The strange misfire reading showed up immediately
after the sensor was replaced and has persisted over 30,000 miles and many
tune ups. All while the van is running fine.

Can an exhaust restriction manifest as a misfire reading due to slowing the
crankshaft between powerstrokes? It seems like this could cause an uneven sine wave signal to the comp resulting in a misfire code.

I can't get my 2009 registration until I fix the problem that no mechanic
has been able to fix. In Atlanta I can't sell the van, legally drive the
van, or register it. aaaggghhh!!!

I will be posting this question in the electrical and engine forums.

Thanks
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