94 LT1 Short/PCM ???
Thread Starter
Intermediate
Joined: Sep 2005
Posts: 38
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From: Desoto Tx
94 LT1 Short/PCM ???
My 94 LT1 will short or something every now and then and not start. I will turn over and i hear the fuel pump, but won't start. I've replaced the Opti, Fuel Filter, Fuel Pressure reg, etc.. and it still happens...
It has stopped on me 3 times while driving, but i've learned that if i hit the passenger side knee bench or different areas of that dash while turning the key it will fix it and not happen again for awhile..
Anybody had similar issues? I'm thinking maybe the PCM, ECM , CCM ?
Not sure how to track it since it's intermittent.
Also considered maybe the fuse panel has a short ?
Any help in tracking this would be greatly appreciated, and anybody local who can help me fix it, i'm more than willing to compensate for it.
Thx in advance.
It has stopped on me 3 times while driving, but i've learned that if i hit the passenger side knee bench or different areas of that dash while turning the key it will fix it and not happen again for awhile..
Anybody had similar issues? I'm thinking maybe the PCM, ECM , CCM ?
Not sure how to track it since it's intermittent.
Also considered maybe the fuse panel has a short ?
Any help in tracking this would be greatly appreciated, and anybody local who can help me fix it, i'm more than willing to compensate for it.
Thx in advance.
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
you need a copy of the Helm Factory Service Manual - www.helminc.com - and a digital volt meter.
It is time to debug... you have a problem in the wiring... beyond that, I am not sure where to tell you to start.
Except, I would consider taking the dash apart and checking for burned, frayed or otherwise damaged wiring.
It is time to debug... you have a problem in the wiring... beyond that, I am not sure where to tell you to start.
Except, I would consider taking the dash apart and checking for burned, frayed or otherwise damaged wiring.
Burning Brakes
Joined: Nov 2005
Posts: 848
Likes: 1
From: 1992 LT1 6 speed Cayman Islands
Your problem is probably in the fuse box on a connection to one of the fuses like the ECM (5amp), coil (10amp) or fuel pump (10 amp) fuses.
This is probably why it fixes itself when you hit the dash on the passenges side. ( What made you think to hit the dash here anyway to fix the problem? Did you smell something burning on this side?)
A bad or intermittant commection on either of these will cause the car to shut off.
I do not think it is a short to the PCM ECM or CCM as a short here will throw a code for an open circuit to that module. The wireing to these are also not connected to the dash as they are mounted to the panel behind the dash. Do you have any codes set?
Pull these fuse and clean them off and see what happens. If it still occurs you will have to pull that part of the dash and check the wireing behind the fuse box for corroded connections.
Good luck
Jerris
This is probably why it fixes itself when you hit the dash on the passenges side. ( What made you think to hit the dash here anyway to fix the problem? Did you smell something burning on this side?)
A bad or intermittant commection on either of these will cause the car to shut off.
I do not think it is a short to the PCM ECM or CCM as a short here will throw a code for an open circuit to that module. The wireing to these are also not connected to the dash as they are mounted to the panel behind the dash. Do you have any codes set?
Pull these fuse and clean them off and see what happens. If it still occurs you will have to pull that part of the dash and check the wireing behind the fuse box for corroded connections.
Good luck
Jerris
Thread Starter
Intermediate
Joined: Sep 2005
Posts: 38
Likes: 0
From: Desoto Tx
Originally Posted by Jerris
Your problem is probably in the fuse box on a connection to one of the fuses like the ECM (5amp), coil (10amp) or fuel pump (10 amp) fuses.
This is probably why it fixes itself when you hit the dash on the passenges side. ( What made you think to hit the dash here anyway to fix the problem? Did you smell something burning on this side?)
A bad or intermittant commection on either of these will cause the car to shut off.
I do not think it is a short to the PCM ECM or CCM as a short here will throw a code for an open circuit to that module. The wireing to these are also not connected to the dash as they are mounted to the panel behind the dash. Do you have any codes set?
Pull these fuse and clean them off and see what happens. If it still occurs you will have to pull that part of the dash and check the wireing behind the fuse box for corroded connections.
Good luck
Jerris
This is probably why it fixes itself when you hit the dash on the passenges side. ( What made you think to hit the dash here anyway to fix the problem? Did you smell something burning on this side?)
A bad or intermittant commection on either of these will cause the car to shut off.
I do not think it is a short to the PCM ECM or CCM as a short here will throw a code for an open circuit to that module. The wireing to these are also not connected to the dash as they are mounted to the panel behind the dash. Do you have any codes set?
Pull these fuse and clean them off and see what happens. If it still occurs you will have to pull that part of the dash and check the wireing behind the fuse box for corroded connections.
Good luck
Jerris
Maybe i need to go to Autozone and let them pull the codes to make sure ?
I'll have to remove that kneebar and inspect the wiring, was just hoping there was somebody local who's done that type of thing before, as Murphy seems to follow me a lot when its my only transportation....
Safety Car
Joined: Apr 2003
Posts: 3,793
Likes: 9
From: VA
I think instead of searching randomly for a hypothetical short, you need to diagnose what the problem is.
Next time it won't start, figure out why it won't start. Start with the most basic - is it not getting fuel or not getting spark? Then work upwards to find out what component is failing.
Maybe that component is failing due to an intermittent short, or maybe not, but at least figure out which component it is.
Next time it won't start, figure out why it won't start. Start with the most basic - is it not getting fuel or not getting spark? Then work upwards to find out what component is failing.
Maybe that component is failing due to an intermittent short, or maybe not, but at least figure out which component it is.
Safety Car
Joined: Apr 2004
Posts: 4,532
Likes: 7
From: Lahaina Hi
Above the kick panel on the pass side is a stud sticking out with a bunch of ground wires connected to it .You may have a water leak draining down behind the fuse box .
Your ECM is under the hood above the battery.
When mine did this I had to clean all the wires on the back side of the fuse box and the main ground bolt where about 6 wires connect to the body bolt.A month later I had a simmilar problem and though it was the same again ,I had a new key made and it cured the problem.
Your ECM is under the hood above the battery.
When mine did this I had to clean all the wires on the back side of the fuse box and the main ground bolt where about 6 wires connect to the body bolt.A month later I had a simmilar problem and though it was the same again ,I had a new key made and it cured the problem.
Thread Starter
Intermediate
Joined: Sep 2005
Posts: 38
Likes: 0
From: Desoto Tx
Originally Posted by REDC4CORVETTE
Above the kick panel on the pass side is a stud sticking out with a bunch of ground wires connected to it .You may have a water leak draining down behind the fuse box .
Your ECM is under the hood above the battery.
When mine did this I had to clean all the wires on the back side of the fuse box and the main ground bolt where about 6 wires connect to the body bolt.A month later I had a simmilar problem and though it was the same again ,I had a new key made and it cured the problem.
Your ECM is under the hood above the battery.
When mine did this I had to clean all the wires on the back side of the fuse box and the main ground bolt where about 6 wires connect to the body bolt.A month later I had a simmilar problem and though it was the same again ,I had a new key made and it cured the problem.
Hmm... interesting... i'll have to take off the kneebar and look around, but i think i'm ruling out VATS as when you hit it, it starts immediately, and VATS takes 6 mins to reset right ?
I'm just not that good at "Electrical" issues, gimme a failed part i can wrench it, but tracing down the ghost in the machine just isn't my forte...
I sure hope i can make heads or tails of this though, since it has cutoff while driving and that can get pretty dangerous.
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