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does this sound like a pcm going bad??

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Old 08-04-2007, 12:10 AM
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Default does this sound like a pcm going bad??

Problem started when i got the car back from outlaw.

I had no AC. tried EVERYTHING to get it to work. I ended up putting on a separate switch to engage the compressor.

then a few weeks ago i got a ses for the IAT. replaced the sensor. ect..... no luck.

right before that my gas gauge went. then my temp gauge. now my fans are staying on after i turn the car off.

I went to finish line performance (sponsor on here) and they said the ground from the IAT is putting out 5v. i have a pcm on its way (used from same model car) and am going to get my tune switched to the new pcm.

IF this is the pcm going bad what can i do to make sure the new one doesn't start frying the same parts?
Old 08-04-2007, 09:58 AM
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Could just be alot of things going on different. The no ac could have been from low pressure.

As for the other stuff, that might be a burnt wire somewhere?
Old 08-04-2007, 02:21 PM
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It's much more likely a harness fault than the PCM itself.
I'd inspect all of the block-chassis, chassis-PCM ground
straps first off. Temperature sensor faults can really muss
up its mind and the more bogus data it gets the flakier it
all will be.
Old 08-04-2007, 02:36 PM
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Originally Posted by jimmyblue
It's much more likely a harness fault than the PCM itself.
I'd inspect all of the block-chassis, chassis-PCM ground
straps first off. Temperature sensor faults can really muss
up its mind and the more bogus data it gets the flakier it
all will be.
I agree, check the harness thoroughly. Good Luck
Old 08-04-2007, 09:37 PM
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Take it to straight line performance in New Lenox

on school house road just south of lincoln-way highschool. across the street from the cozy cafe
Old 08-10-2007, 02:33 PM
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just got the tune put in the new pcm. the pcm was the problem. my gas gauge, and AC both came back too.

all is good now




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