C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Chip /ECM question

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Old Nov 30, 2004 | 06:20 PM
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Default Chip /ECM question

How can you tell if the Chip in your ECM is going bad? Or does it ever go bad?
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Old Nov 30, 2004 | 08:31 PM
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Best way is to post your Year and symptoms; then, someone can go through the Manual Trouble Tree Charts with you to determine the problem.
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Old Nov 30, 2004 | 08:55 PM
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I just ended up replacing my ECM. What a pain trying to acquire one. Apparently the '92 vettes are the bastard child (I still love er though).
I guess '91 was the L98, ''92 was the LT1 Multiport, and '93 was the LT1 Sequential port. Chevy doesnt sell the ECM for '92 anymore, arrrrrgh.

Anyway, my car had numerous things going on with it:
security lite flashing
ASR service light on
Service Engine Light on
and a SYS would flash on my speedo.
Also my speedo would show 0 instead of my speed.

Took er in, they said it was the ECM, but dont stock them anymore. I said how can you charge me for something you cant fix. They said no charge. Three week later had me a new ECM.

Hope this helps
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Old Nov 30, 2004 | 09:05 PM
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Originally Posted by Dr_737
Apparently the '92 vettes are the bastard child (I still love er though).
Hmm... That's the same ECM used in the 92-93 Vette and the 93 F-body, probably lots of other cars too. Advance auto parts had one in stock when I needed one a year or so ago.
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Old Nov 30, 2004 | 11:20 PM
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AC Delco - www.acdelco.com - shows part #88999183 for the '92 and about 6 EPROMS. X-reference indicates it's for the '92 and '93 Vettes and FBodys. Find another Dealer.
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Old Dec 1, 2004 | 12:15 AM
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Originally Posted by Dr_737
I just ended up replacing my ECM. What a pain trying to acquire one. Apparently the '92 vettes are the bastard child (I still love er though).
I guess '91 was the L98, ''92 was the LT1 Multiport, and '93 was the LT1 Sequential port. Chevy doesnt sell the ECM for '92 anymore, arrrrrgh.

Anyway, my car had numerous things going on with it:
security lite flashing
ASR service light on
Service Engine Light on
and a SYS would flash on my speedo.
Also my speedo would show 0 instead of my speed.

Took er in, they said it was the ECM, but dont stock them anymore. I said how can you charge me for something you cant fix. They said no charge. Three week later had me a new ECM.

Hope this helps
Thanks..I have the same symptoms (intermitantly) except my speedo is fine.
I guess I better start looking another ECM.
Anyone here ever try a refurbished ECM?
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Old Dec 1, 2004 | 03:58 PM
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Don't know of any new - I believe they're all refurbished.
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Old Dec 1, 2004 | 05:46 PM
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Originally Posted by SunCr
Don't know of any new - I believe they're all refurbished.
I think that's what autozone and other parts stores stock
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Old Dec 7, 2004 | 12:22 AM
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Originally Posted by Dr_737
I just ended up replacing my ECM. What a pain trying to acquire one. Apparently the '92 vettes are the bastard child (I still love er though).
I guess '91 was the L98, ''92 was the LT1 Multiport, and '93 was the LT1 Sequential port. Chevy doesnt sell the ECM for '92 anymore, arrrrrgh.

Anyway, my car had numerous things going on with it:
security lite flashing
ASR service light on
Service Engine Light on
and a SYS would flash on my speedo.
Also my speedo would show 0 instead of my speed.

Took er in, they said it was the ECM, but dont stock them anymore. I said how can you charge me for something you cant fix. They said no charge. Three week later had me a new ECM.

Hope this helps
please let me know if the ecm fixed you,i have a 1992 /the sys and security light flashes ,it starts good cold but doesn'e restart..tonycorvettehd@bellsouth.net
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Old Dec 10, 2004 | 12:36 PM
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Default restart ecm

Originally Posted by jabez
Thanks..I have the same symptoms (intermitantly) except my speedo is fine.
I guess I better start looking another ECM.
Anyone here ever try a refurbished ECM?
did the ecm fix your problem,,,?????????????????????????????? ??????????????????????????????? tonycorvettehd@bellsouth.net
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Old Dec 21, 2004 | 06:08 PM
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Yes the ECM Fixed my problem sorry for the delayed reply
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Old Dec 21, 2004 | 06:29 PM
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Dayum - my car just got the same set of symptoms. Last night we were working on the chip, and the laptop computer malfunctioned while the chip was in the eprom burner. We put the chip back in the ECM, and the schiznit hit the fan. Now, the SYS message displays, the security light flashes, the speedo reads zero (as do the oil and water digital temperature readings), the 'service asr' is light, 'Service engine soon' is lit, and the car is in limp-home mode. It can't run over 3000 RPM, and the ASR isn't working. Should I be getting another ECM?
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