Bad PCM Symptoms, please help!
Thread Starter
Instructor
Joined: Apr 2008
Posts: 137
Likes: 1
From: Saratoga Springs NY
Bad PCM Symptoms, please help!
The check engine light on my 1995 LT1 6 speed is on and the car keeps stalling. My AC stopped working at the same time (Is it normal for the ac to shut off when the check engine light comes on?). I barely made it to the parts store to get it scanned. He hooked up the OBDII scan tool and it would not link to my car??? Another strange symptom is that with the key in the on position and the car not running the smog pumps turns on and off rapidly several times. I was lucky enough to make it home because it was getting worse. Now the car wont start at all. I just replaced the opti cap/rotor, coil, wires and plugs a couple weeks ago and it was running fine. I tried to pull the codes with a paper clip and there were none listed, yet the check engine light is on. Does this sound like a PCM or what? Any one ever had similar symptoms? Where can I buy a used or new PCM and what will I have to do to get it to work with my car? Flash it etc... Any pointers will be appriciated. Where can I get it flashed, what does "flashing" exactly do?
Last edited by Showcase1186; Jul 18, 2010 at 08:12 PM.
Racer
Joined: Feb 2008
Posts: 269
Likes: 0
From: Victoria British Columbia
I'm not sure what year they switched but it may be an OBDII connecter with still OBDI PCM. The paper clip should work, did it go through diagnostic routine? I'd be looking in the engine bay for unplugged wires. possibly the MAF is dislodged.
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
I would be doing a lot more diagnostics before investing in a new PCM
By jumpering the correct pins on ALDL connector you can get fault codes displayed in the dash cluster
Read ( bottom of page )
http://www.corvettebuyers.com/c4vettes/codes.htm
'95 is OBDI with 16 pin OBDII connector.
Last edited by rodj; Jul 19, 2010 at 03:59 AM.
