Fatal PCM Damage?
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10 Second Club
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Joined: Jun 2005
Posts: 805
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From: Arlington, Texas (Dallas Area)
Fatal PCM Damage? If you get your car tuned (and it puts out great HP), then take it to another tuner who puts a different program on your PCM, (in which it loses about 40 HP when it should have gained another 10), then take it back to the person who originally put the bad a__ tune on it, and they try to fix it, yet it reads a low HP; DOES THIS MEAN THE PCM IS PERMANENTLY DAMAGED? 
They were 2 different programs and I am worried that the damage is irreversible. Is there any way to get my HP back from a tune? Or is it possible to put in a whole new PCM and start over? 
They were 2 different programs and I am worried that the damage is irreversible. Is there any way to get my HP back from a tune? Or is it possible to put in a whole new PCM and start over? 
Probably just means the original tuner, can't see
what the other changed. Or, that something has
drifted (learned) and needs time to get back. It's
unlikely that you could damage the PCM in a way
that loses power, but it still functions "properly".
You probably want to have some logging done and
see if there are any signs that point to bent fueling,
misfires, use of low octane timing table, etc. A lot
of fuel and spark learning is possible and a super
aggressive tune might have pushed you deep into
the weeds, after which your original tune might be
all punked out (through no fault of its own).
what the other changed. Or, that something has
drifted (learned) and needs time to get back. It's
unlikely that you could damage the PCM in a way
that loses power, but it still functions "properly".
You probably want to have some logging done and
see if there are any signs that point to bent fueling,
misfires, use of low octane timing table, etc. A lot
of fuel and spark learning is possible and a super
aggressive tune might have pushed you deep into
the weeds, after which your original tune might be
all punked out (through no fault of its own).
