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 PCM reset??

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BillBoost37
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BoattailBob
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PCM reset?? Empty
PostSubject: PCM reset??   PCM reset?? EmptyThu Jul 24, 2008 11:28 am

This morning I started my drive to work and got half a block and my gear indicator (lights that show the gears on the dash) started flashing. It looked the same as when I flash an new tune to my PCM via HPT. Didnt seem to affect anything and went right on running, but also has me a little worried. Anyone ever experience this? Im really getting tired of dumping money into this car...this may be the end if I need to replace the PCM.
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BillBoost37
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PCM reset?? Empty
PostSubject: Re: PCM reset??   PCM reset?? EmptyThu Jul 24, 2008 12:21 pm

Did the car possibly stutter once?

I saw a similar thing when the crank sensor was acting up on mine. When I looked for codes, I sometimes found one related to it starting n gear and once a crank sensor error. I let mine go for months to get something consistent enough to find it.
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BoattailBob
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PCM reset?? Empty
PostSubject: Re: PCM reset??   PCM reset?? EmptyThu Jul 24, 2008 1:29 pm

It didn't stutter at all, didn't throw a code either. So..I guess I'll wait to see if it does happen again. Thanks!
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AA
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PCM reset?? Empty
PostSubject: Re: PCM reset??   PCM reset?? EmptyThu Jul 24, 2008 1:35 pm

PCMs are odd things. I have flashed mine with the ignition off before, and it stuck!

_________________
'98 SC Riviera • 281k miles • 298 HP/370 TQ • 0-60: 5.79s • ET: 13.97 @ 99.28 • 4087 lb • 20.1 avg MPG • Nelson Ledges Lap: 1:30
3.4" pulley • AL104 plugs • 180º t-stat • FWI w/K&N • 1.9:1 rockers • OR pushrods • LS6 valve springs • SLP headers • ZZP fuel rails
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'05 GTO • 85k miles • 0-60: 4.8s • 16.9 avg MPG • Nelson Ledges Lap: 1:26
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'70 Olds Ninety-Eight Holiday Coupe • 116k miles • 455 Rocket V8
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'95 Celica • 152k miles • 0-60: yes
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KillaKeninaRiv
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PCM reset?? Empty
PostSubject: Re: PCM reset??   PCM reset?? EmptyThu Jul 31, 2008 12:09 pm

mine does the same thing. when i start it and put it into drive it flashes i think 4 times
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TonySmooth89
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PCM reset?? Empty
PostSubject: Re: PCM reset??   PCM reset?? EmptyFri Aug 01, 2008 3:47 pm

AA wrote:
PCMs are odd things. I have flashed mine with the ignition off before, and it stuck!

That happened to me too. I thought it was just coincidence but seeing as how it happened so someone else , maybe not.
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KillaKeninaRiv
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PCM reset?? Empty
PostSubject: Re: PCM reset??   PCM reset?? EmptyFri Aug 01, 2008 8:00 pm

so i have to have my PCM reset as well?
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denim
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PCM reset?? Empty
PostSubject: Will a dormant PCM fail?   PCM reset?? EmptyTue Jul 20, 2021 8:29 am

My parts car, a '95, SC sat for close to 10 years untouched.
It ran great before the chassis failed and I'd like to sell engine/trans, but probably need a video of it running to make the sale.
At this point, it turns over fine and is getting fuel, but no spark.

Can the pcm lose its programming over time?
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albertj
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PCM reset?? Empty
PostSubject: Re: PCM reset??   PCM reset?? EmptyTue Jul 20, 2021 4:09 pm

denim wrote:
My parts car, a '95, SC sat for close to 10 years untouched.
It ran great before the chassis failed and I'd like to sell engine/trans, but probably need a video of it running to make the sale.
At this point, it turns over fine and is getting fuel, but no spark.

Can the pcm lose its programming over time?

No spark = something like the crank sensor is failed and so the car won't finish the startup sequence. Also check the wires to the ignition module and the firewall connector for any that might be broken inside the insulation, 95s were notorious for that problem.
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