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L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

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Old 10-12-2013, 11:52 AM   #1
mikegib
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Default 93 computer

hi i was wondering if any one had idle issues the shop said i need a new computer anyone know were i could buy one?
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Old 10-12-2013, 03:27 PM   #2
92ragtop
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You can get yours rebuilt. It would be hard to find another one....I believe that 92-93 are unique. I had a couple of different issues in my 92, including a higher than normal idle. Sometimes when restarting the warm engine, the idle would sit at 1500RPM for 30-60 seconds before dropping. If that is happening to you, try this: While it's at that high idle, tap the top of the ECM with something (eg a screwdriver handle). If the idle drops down right away, it's almost certain that you have an issue in your ECM. I had mine rebuilt, and no issues since.
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Old 10-12-2013, 04:57 PM   #3
mikegib
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hi thanks for the info were can i get it rebuilt ?
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Old 10-12-2013, 05:10 PM   #4
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you can go into a juke yard. a lot of chevy use the same ecm. google your ecm and see how maney chevys use the same ecm. remeber. dont know on a 93 model but in my 86 I have to keep the ecm chip. and re used in the new ecm
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Old 10-12-2013, 07:37 PM   #5
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Quote:
Originally Posted by hitmanpty View Post
you can go into a juke yard. a lot of chevy use the same ecm. google your ecm and see how maney chevys use the same ecm. remeber. dont know on a 93 model but in my 86 I have to keep the ecm chip. and re used in the new ecm
The 9278 was not used by any other application that I'm aware of. The 86thru 91 ecm did share other applications. The advice to have it rebuilt is sound.
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Old 10-12-2013, 07:40 PM   #6
armysnipe
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What idle issues are you having that made them conclude it's the ECM?
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Old 10-13-2013, 03:22 AM   #7
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Quote:
Originally Posted by hitmanpty View Post
a lot of chevy use the same ecm.
Nope.
Only used in 92/93 Vettes and '93 F-Bodies
Of all the C4 ECM's used ,it appears on here as the one most frequently with problems, many of which are intermittent or not able to be clearly identified.
The last NOS ECM from GM was sold years ago and some have had patchy results with the re-builds
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Old 10-14-2013, 04:05 PM   #8
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Be careful here. These computers in general do not fail.

Often the dealer will point to the computer becuase it will show the DTC's, but I have yet to find out in trouble shooting that the computer itself is at fault. Spend some time to really troubleshoot the problem before assuming it's the ECM...

If you are unlucky and it is, they are truly hard to find...I had two of them and sold them last year within seconds of putting them up...
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Old 10-14-2013, 08:20 PM   #9
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Good advice here...Although the computers in the '92 and '93 Vette's do, in fact, fail regularly.

If you need a computer, send yours to be rebuilt. I just did a repair with a rebuilt computer on a '92 Vert and the computer worked flawlessly. Has the dealer (or you) pulled the codes on your unit?

K&B Specialty Products:

http://kandbcorvetteproducts.com/site/

I think the rebuild was $275.00 and a one week turn. They did an awesome job and the car runs perfect.

Good luck,

Rossi

Quote:
Originally Posted by ScaryFast View Post
Be careful here. These computers in general do not fail.

Often the dealer will point to the computer becuase it will show the DTC's, but I have yet to find out in trouble shooting that the computer itself is at fault. Spend some time to really troubleshoot the problem before assuming it's the ECM...

If you are unlucky and it is, they are truly hard to find...I had two of them and sold them last year within seconds of putting them up...

Last edited by Rossi396; 10-14-2013 at 08:23 PM.
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Old 10-14-2013, 08:20 PM
 
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