Hello Everyone,
I recently purchased a 92 GP with 168k miles on it. While I am new to Grand Prix's, I have been working on cars as a hobby for the better part of 30 years (from ground-up restos to routine maintenance).
The first thing I did was replace a cracked vacuum line and decided to inspect the rest of the vacuum lines. One required removal of the battery as it goes underneath it, which means a computer re-learn process. After verifying all vacuum lines were good I put it all back together and ran it through the learning curve. When I got home it idled for about 5 minutes then just died and would not restart. Read the code and it was code 42 (ICM). Went and got a new ICM and disconnected the battery to clear codes while replacing it. Ran it through the learning process again and it ran good (mostly) for a couple of days, then died and would not start and gave code 42 again. Let it sit for a few days while doing other stuff, came back, still wouldn't start. Removed the battery for 10 minutes and it started right up. This time only lasted 1 day after learning process, and again code 42. Tried it all over again, just got back from a 40 mile trip where it acted pretty funky a lot of the time and code 42 again. (I should say that I always verified that there were no error codes before continuing each time).
Is it really possible that it could kill 2 ICM's in a row like that, or is there something else that might be causing this?
Already done:
Replaced the O2 sensor
Replaced the fuel pump relay
Replaced the ICM
Repaired all vacuum lines
The car has a 4 speed auto (not factory) with what feels like a converter lock in it also.
I could really use some help with this.
Thanks in advance for any input you might have.
