Help with PCM
Thread Starter
Le Mans Master
Joined: Aug 2003
Posts: 9,298
Likes: 4
From: American Canyon Lethal Injection
Help with PCM
I need info on how to remove the PCM from my'97 C5. I want to send it out to have it changed to a '98 PCM OS so I can have the car dyno tuned. Thanks,
Rsty
Rsty
Pro
Joined: Feb 2004
Posts: 657
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From: michigan
Originally Posted by RstyNutz
I need info on how to remove the PCM from my'97 C5. I want to send it out to have it changed to a '98 PCM OS so I can have the car dyno tuned. Thanks,
Rsty
Rsty
Pro
Joined: Aug 2000
Posts: 517
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From: Arlington Texas
I removed the PCM from my 2000 for programming recently. You remove the liner at the rear of the front passenger wheel well. There's also a filler piece behind the liner that you have to remove. That will give you enough room to get to the PCM. The Throttle Actuator Control module is screwed onto the PCM bracket, and you have to remove the TAC first. You don't need to undo the TAC connectors. Just unscrew it and let it dangle. Now remove the PCM wiring harness connectors. They're held in with screws from the bottom. The PCM is held in by a bracket going across the front. You completely unscrew the front fastener, but you just loosen the rear fastener and let the bracket stay anchored onto the car. The rear fastener is a PITA to get to; you'll have to do it by feel. Once loose, you can position the bracket out of the way and pop the PCM forward and out. Mine was stuck in there pretty good, and I had to give it a good tug to get it out. If I forgot anything, I'm sure you can figure it out once you're there. Just don't completely remove the rear screw on the PCM bracket!
Thread Starter
Le Mans Master
Joined: Aug 2003
Posts: 9,298
Likes: 4
From: American Canyon Lethal Injection
Originally Posted by Jim Taylor
I removed the PCM from my 2000 for programming recently. You remove the liner at the rear of the front passenger wheel well. There's also a filler piece behind the liner that you have to remove. That will give you enough room to get to the PCM. The Throttle Actuator Control module is screwed onto the PCM bracket, and you have to remove the TAC first. You don't need to undo the TAC connectors. Just unscrew it and let it dangle. Now remove the PCM wiring harness connectors. They're held in with screws from the bottom. The PCM is held in by a bracket going across the front. You completely unscrew the front fastener, but you just loosen the rear fastener and let the bracket stay anchored onto the car. The rear fastener is a PITA to get to; you'll have to do it by feel. Once loose, you can position the bracket out of the way and pop the PCM forward and out. Mine was stuck in there pretty good, and I had to give it a good tug to get it out. If I forgot anything, I'm sure you can figure it out once you're there. Just don't completely remove the rear screw on the PCM bracket!
Thank you very very much for those step by step instructions on how to remove it and how NOT to remove the rear screws...I'll get to it this coming weekend...BTW how they your PCM turn out after the tuning and who did it for you?Thanks again
Rsty
Last edited by SLPRC5; Feb 16, 2006 at 02:19 AM.
Pro
Joined: Aug 2000
Posts: 517
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From: Arlington Texas
I got a mail-order tune from Texas Speed and Performance when I changed the cam. The car's an A4, and I wanted to make sure I could drive the car to a local tuner for an LS1Edit tune on the dyno. I wound up doing cam, heads and headers all at the same time, so I'm not sure how good the mail order tune was since it was just for the cam. The car started and ran with no problems, it seemed a little rich, and I drove it to 21st Century Muscle Cars in Dallas for the 'real' tune.
Race Director
Joined: Oct 1999
Posts: 17,710
Likes: 1,219
From: Phila PA, Bonita Springs FL
Have another pcm bracket on hand..
They ALWAYS break, (cheap plastic) when you pull out the pcm..!!!!
On install of the new bracket, OR if your lucky NOT to break it, spray the 2 sides with a little WD-40...
Trust me on this..
They ALWAYS break, (cheap plastic) when you pull out the pcm..!!!!
On install of the new bracket, OR if your lucky NOT to break it, spray the 2 sides with a little WD-40...
Trust me on this..
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Thread Starter
Le Mans Master
Joined: Aug 2003
Posts: 9,298
Likes: 4
From: American Canyon Lethal Injection
Originally Posted by djones14
I called the guy you suggested and he never has called me back.
What about the other modules?? Are they going to talk OK with a 98 PCM ????
DJ
What about the other modules?? Are they going to talk OK with a 98 PCM ????
DJ