1994 lt-1 warm start??
Thread Starter
Burning Brakes
Joined: Oct 2008
Posts: 1,021
Likes: 0
From: HOUSTON TEXAS
1994 lt-1 warm start??
i have a 1994 lt 1 that runs and drives like new, the problem is some days after i drive it a while it won't start.. i let it sit a while and it cranks perfect.. i had it in the garage for months after i got a new c-6.. recent tune up. early morning it cranks fine.. thinking the ing control module??? what could it be??? new batt, alt, starter.. so whats left?? it spins fine..maybe the coil??
thanks
thanks
Last edited by MLCZ51; Feb 4, 2010 at 12:42 AM.
Team Owner
Joined: Mar 2001
Posts: 54,124
Likes: 30
From: Cincinnati, Oh USA
I will ask my mechanic where the spark module is on a 94, I own an 87, and have experienced a similar problem. With some age and hot, the spark module (the device that pulses the primary of the spark coil/s) works weakly or not at all but begins working properly after it cools down.
Instructor
Joined: Jan 2010
Posts: 174
Likes: 4
From: Austin_Palm Bay_Houston Texas_Florida_Texas
Your symptoms don't really sound like an ICM problem. Many ICM issues are related to heat issue, but you state that the car runs fine once started and engine warm. It may be an ICM issue, but I doubt it.
I would first hook up a fuel pressure gauge and check the fuel pressure with engine running, and then engine off and check to see how slowly pressure drops. It should drop very very slowly. You may have some leaky injectors........ Will the engine absolutely not start after it has been driven/warmed up or does the engine just turn over for a long period before starting ????
Actually, the first thing you need to do is check for error codes. This is easily done by shorting pin#4 and pin#12 on your ALDL.
I would first hook up a fuel pressure gauge and check the fuel pressure with engine running, and then engine off and check to see how slowly pressure drops. It should drop very very slowly. You may have some leaky injectors........ Will the engine absolutely not start after it has been driven/warmed up or does the engine just turn over for a long period before starting ????
Actually, the first thing you need to do is check for error codes. This is easily done by shorting pin#4 and pin#12 on your ALDL.
Le Mans Master
Joined: Jan 2006
Posts: 5,621
Likes: 207
From: Orlando FL
Having said that, I would also just check out the possibility of a defective FPR (fuel pressure regulator) back bleeding fuel into the vacuum hose and into the manifold. It could be flooding on shutdown, just a thought and easy to check by pulling hose off and eliminating that possibility.
I don’t think checking codes will show anything up for this kind of problem. And don’t feel the fuel pump is the problem either as the problem would occur at other times while driving or when car is cold. Checking the fuel pressure is always a proper procedure to do.
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Burning Brakes
Joined: Mar 2005
Posts: 800
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believe it or not it generally isnt the opti, that gets blamed for all ignition issues on a LT1. test components is certainly cheaper than throwing parts at it. it kind of sounds like something is getting heat soaked. could possibly be coil, next time it does it if you are home check for spark out of the coil.
Burning Brakes
Joined: Mar 2005
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Burning Brakes
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From: That one city...you know that one. Idaho
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