need some help understanding trouble codes 1994

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Aug 24, 2009 | 07:19 PM

speedoholic

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Racer

Joined: Aug 2009

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From: lexington NC

need some help understanding trouble codes 1994

Hi My 94 just died today, It acted like it was running out of gas, Ive checked the codes via the paper clip trick and using the speedo.
I got codes on mod 1. c12 and on mod 4. h48 can anyone tell me what that means? thanks

Aug 24, 2009 | 07:28 PM

speedoholic

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Racer

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From: lexington NC

NEVERMIND I found it its a MAS code. Now answer me this, I unhook it and it starts up and runs perfect, I plug it in and it dies! WTF?

Aug 24, 2009 | 07:30 PM

vetteblack

Burning Brakes

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From: Houston PA

12 means your looking for codes, 48 is MAF, mass air flow sensor. That is where to start, it doesnt mean just to replace the MAF. Check plugs, hoses, and look for obstructions. Dont forget to pull the paper clip before you restart it.

Aug 24, 2009 | 07:31 PM

rodj

Le Mans Master

Joined: Aug 2000

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From: Australia

Quote:

Originally Posted by speedoholic

I got codes on mod 1. c12 and on mod 4. h48 can anyone tell me what that means?

Module "1" is still the CCM module.
Module "4" is the PCM module

C means it is a current code , H means it is a "history" code as in a fault seen before but not currently active.

Try clearing the codes and see if they come back
(half way down page )

http://www.digitalcorvettes.com/foru...56&postcount=9

Aug 24, 2009 | 07:47 PM

speedoholic

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Racer

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From: lexington NC

Does anyone know why it runs perfect with the maf unhooked and when its hooked up it wont even start? Im lost ive never seen a car do that before. I took the MAF sensor off my 99 SS camaro and put on it and it does the same thing..... crazy

Aug 24, 2009 | 07:49 PM

speedoholic

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Racer

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From: lexington NC

Oh one other question, What happends if I just leave it unhooked? thanks

Aug 24, 2009 | 07:52 PM

vetteblack

Burning Brakes

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From: Houston PA

Have you driven it with the maf disconected, or is it running sitting still?

Aug 24, 2009 | 08:15 PM

speedoholic

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Racer

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From: lexington NC

Quote:

Originally Posted by vetteblack

Have you driven it with the maf disconected, or is it running sitting still?

With the MAF hooked up it wont even start, It acts like it is out of gas, It starts just for a sec a dies. When I UNhook the MAF it runs perfect.
I drove it about 3 miles with it unhooked and even drove it hard. It is running better then it ever has... When I hook up the MAF from the 99 ls1 camaro it will start up and run for 1-2 sec before dieing.