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

94 Lt1 PCM values. Help!!

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Old Jan 3, 2011 | 11:46 AM
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Default 94 Lt1 PCM values. Help!!

Hi all, and Happy New Year.

A friend has a problem with his 94 and we need the PCM values. I mean, how many volts or Amps has to be each pin at PCM to find a problem who lives into the car since 4 months ago.
Do anyone have any diagram or table with those values?

Thanks to all from Spain

Last edited by spanishvette86; Jan 3, 2011 at 01:25 PM.
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Old Jan 3, 2011 | 12:02 PM
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That information for with voltage at pins is not exactly published with the diagrams in the FSM.

However if you stated exactly what the problem with the car was, I'm sure some specific information could be given. What is the area of the problem?
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Old Jan 3, 2011 | 01:15 PM
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Originally Posted by pcolt94
That information for with voltage at pins is not exactly published with the diagrams in the FSM.

However if you stated exactly what the problem with the car was, I'm sure some specific information could be given. What is the area of the problem?
Thanks for your help

The car doesn´t want to start. I knew about this car today, because his owner called me totally desperated, so I don´t know a lot about it, but i will tell you the few things I know:

- The last time the car worked, it had a Code 42, but it runs. The owner goes to 5500 rpm a moment, and a few minutes later, the car starts to lose power until it dies.
-When he try to crank, the car has false explosions at Intake Manifold and mufflers.
- The Opti is changed. It´s new, an MSD. The problem continues, exactly the same.
-Distribution is OK
-Gas injection is OK
-Spark appears so soon (out of point)
-PCM revised by Mid America.

Thats all I know for the moment.
Any ideas?

P.D: Excuse my English, not my natural language

Last edited by spanishvette86; Jan 3, 2011 at 01:24 PM.
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Old Jan 3, 2011 | 02:27 PM
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No codes on an LT1 and no start - can you find a working coil and ICM and swap them in to see if that is the issue?
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Old Jan 3, 2011 | 03:07 PM
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I would at this point check for fuel pressure. Get a gauge on it and see if your loosing pressure. Maybe the fuel pump is bad (or filter). Get to get the simple stuff out of the way first.

Last edited by pcolt94; Jan 4, 2011 at 11:50 AM.
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Old Jan 4, 2011 | 11:21 AM
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Originally Posted by jaa1992
No codes on an LT1 and no start - can you find a working coil and ICM and swap them in to see if that is the issue?
It has code 42. The coil is new and...ICM? Thats the PCM? Sorry, mine´s is a L98, im a little lost at LT1
Thanks for your reply

Originally Posted by pcolt94
I would at this point check for fuel pressure. Get a gauge on it and see if your loosing pressure. Maybe the fuel pump is bad (or filter). Got to get the simple stuff out of the way first.
Ok, i´ll tell him.
Thank You!
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Old Jan 4, 2011 | 04:05 PM
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Originally Posted by spanishvette86
It has code 42. The coil is new and...ICM? Thats the PCM? Sorry, mine´s is a L98, im a little lost at LT1
Ignition Coil Module, it is attatched to the coil.
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