Looks like I bricked my PCM

I installed a Generic tune I found on the internet to see how it performs, I think the battery in my car is junk, it completed the tune(so I thought), I tried to start it, and it ran and idled, but would not rev up, and the fan was on.

I put the battery on the charger, try to talk to the PCM again, no communication, fan stays on all the time, car will start on occasion, but will not rev up, and dies. The service engine soon light is flashing very dim.

I think the PCM is junk. Anybody here repair these?

Its an OBD1, 94 Z28 Auto.

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Originally Posted by cholmes729

I installed a Generic tune I found on the internet to see how it performs, I think the battery in my car is junk, it completed the tune(so I thought), I tried to start it, and it ran and idled, but would not rev up, and the fan was on.

I put the battery on the charger, try to talk to the PCM again, no communication, fan stays on all the time, car will start on occasion, but will not rev up, and dies. The service engine soon light is flashing very dim.

I think the PCM is junk. Anybody here repair these?

Its an OBD1, 94 Z28 Auto.

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Damn... when we would cook mine during tuning the fans would kick on... but the car would crank...no fire.

Im sure someone still sockets these.... but you can pick them up used pretty cheap.... just sold my last one for $40.00 shipped.

If it ran and idled its probably not junk. Just a bad tune. Ses light could be on due to emissions equipment being on the tune that you don't have. Let it charge overnight or try another battery.

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Originally Posted by firebird_1995

If it ran and idled its probably not junk. Just a bad tune. Ses light could be on due to emissions equipment being on the tune that you don't have. Let it charge overnight or try another battery.

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The service engine soon light is not on, it just dimly flashes. It does not cycle when you turn the key on either. Removed the PCM bat fuse, fan goes off, reinstall fuse, fan comes on, same with the ignition fuse. Car will crank fine, you can hear the engine hit every once in awhile. Now it will not communicate.

Your PCM isnt junk. I would charge the battery or get another and reload your stock tune and try again.

I will try it again, but the engine cranks over fine.

update.....

I agree it does just sound like a bad tune. If for some reason it does turn out to be a dead PCM you can have it repaired by Madtuner.

Every time I've killed a PCM, they do nothing. No fire or fuel at all.

Good luck

I disconnected the batteries for like an hour, recharged the battery, tried to connect to the ECM, still nothing, same thing. Any ideas here, Im sure its a bad tune, how do I get it out if I cannot communicate with it?