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Old 09-14-2010, 05:01 PM
lt1ssb lt1ssb is offline
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Default is it possible for a PCM to lose a tune??
can leaving it unhooked from a car for long periords or anyone know anyway that a pcm would lose a custom tune??
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Old 09-14-2010, 05:20 PM
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No. The PCM cannot "lose" a tune.
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Old 09-14-2010, 06:00 PM
MikeOD MikeOD is offline
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The pcm uses flash based memory. Your custom tune replaced the gm tune in the flash. It can never wind up reverting to anything other than what was flashed into it.
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Old 09-15-2010, 06:28 AM
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That's not to say that the PCM can still go bad.
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Old 09-15-2010, 09:23 AM
lt1ssb lt1ssb is offline
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Quote:
Originally Posted by Gregg-O View Post
That's not to say that the PCM can still go bad.
just curious cause it has been sitting in my closet for a year during my rebuild and am putting it back together soon

thanks for the replies
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Bigb9000 is a scammer, you owe me 3 MAP plugs
1996 ss BBB 72k see my build yes its loud and fast
1996 ss BBB 182k
1996 caprice candy green ninja turtle mobile
1995 ss BBB daily driver 165k
1981 Malibu
1985 Regal
and wifey made me buy the venza truck 20k
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Old 09-22-2010, 12:59 PM
geowhite geowhite is offline
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Quote:
Originally Posted by lt1ssb View Post
just curious cause it has been sitting in my closet for a year during my rebuild and am putting it back together soon

thanks for the replies
I think it can. I use LT1 Edit \ OBD2 Prog to load new programs to my PCM. A couple of years ago I was half way through loading when my laptop hung and I was left with a car that wouldn't start and the PCM would not respond to my laptop. I emailed Bryan Herter for help and he advised to disconnect the battery and leave it for I think it was 15 or 30 minutes and the PCM would revert to factory settings. This I did and was able to start the car and then load up the new programing.

George
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