Sick Vette
Drifting
Joined: Jun 2010
Posts: 1,853
Likes: 8
From: Westerly RI
Before you start changing parts, you need some basic diagnosis. When the car dies, you should check for spark at a plug wire, preferably with an induction type timing light, or with a spare plug in one of the plug wires. If you get a good spark, put the plug wire back on and spray a small sniff of ether into the air intake and crank the engine. If it starts momentarily, you can assume a fuel delivery problem. These tests will head you in the right direction, several of the guesses on this thread could be correct, but IMO start with the basics.
Thread Starter
Heel & Toe
Joined: Dec 2010
Posts: 16
Likes: 0
From: Miami Lakes FL
Not a fuel issue. But after talking with these guys i thought the coil is the only thing . Remember i have electricity going to the coil but not coming out.So I'm hoping that's the problem, if it would have been the ICM there would not be electricity going to coil.
Thread Starter
Heel & Toe
Joined: Dec 2010
Posts: 16
Likes: 0
From: Miami Lakes FL
Before you start changing parts, you need some basic diagnosis. When the car dies, you should check for spark at a plug wire, preferably with an induction type timing light, or with a spare plug in one of the plug wires. If you get a good spark, put the plug wire back on and spray a small sniff of ether into the air intake and crank the engine. If it starts momentarily, you can assume a fuel delivery problem. These tests will head you in the right direction, several of the guesses on this thread could be correct, but IMO start with the basics.
Race Director
Joined: May 2008
Posts: 10,742
Likes: 629
From: Manheim Pennsylvania
I hope you found the problem. If not don't discount the fuel pump. I had a car that would just stop and not restart for a few minutes then would run again. Displayed no codes, drove me nuts. When it ran, the engine performed normally. Tested the fuel pressures, they were normal. Then noticed that when the fuel tank was near full the engine was more reliable than when below half. What I discovered was that when the fuel pump was cold it would pump enough fuel to operate the engine. As the pump warmed up to normal operating temperature the pump would loose the ability to pump enough fuel to operate the engine. When it cooled the pump was able to once again supply enough fuel. I was ready to trade that car, took weeks to find that problem.
Le Mans Master
Joined: Mar 2001
Posts: 7,999
Likes: 14
From: Life is just one big track event. Everything before and after is prep and warm-up and cool-down laps
Cruise-In III Veteran
Cruise-In IV Veteran
St. Jude Donor '12
did you replace the wires from the opti to the connector on the passenger intake?
Run the engine in the dark and look for any electrical glow on the plug and coil wires?
Run the engine in the dark and look for any electrical glow on the plug and coil wires?
Burning Brakes
Joined: Dec 2008
Posts: 1,021
Likes: 7
From: Morgan Hill and Marina California
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Thread Starter
Heel & Toe
Joined: Dec 2010
Posts: 16
Likes: 0
From: Miami Lakes FL
I hope you found the problem. If not don't discount the fuel pump. I had a car that would just stop and not restart for a few minutes then would run again. Displayed no codes, drove me nuts. When it ran, the engine performed normally. Tested the fuel pressures, they were normal. Then noticed that when the fuel tank was near full the engine was more reliable than when below half. What I discovered was that when the fuel pump was cold it would pump enough fuel to operate the engine. As the pump warmed up to normal operating temperature the pump would loose the ability to pump enough fuel to operate the engine. When it cooled the pump was able to once again supply enough fuel. I was ready to trade that car, took weeks to find that problem.
Le Mans Master
Joined: Jan 2006
Posts: 6,564
Likes: 6
From: Woodstock Georgia
ps-key on, car off fuel pressure shouldbe about 43psi, engine running 38-39 psi.
Last edited by aminnich; Dec 10, 2010 at 07:18 PM.
Thread Starter
Heel & Toe
Joined: Dec 2010
Posts: 16
Likes: 0
From: Miami Lakes FL
Thread Starter
Heel & Toe
Joined: Dec 2010
Posts: 16
Likes: 0
From: Miami Lakes FL
Thread Starter
Heel & Toe
Joined: Dec 2010
Posts: 16
Likes: 0
From: Miami Lakes FL
Like I mentioned earlier, your symptoms are not at all like a failing opti, but are dead on for a failing ICM. You can check the wiring harness from the opti to the engine harness connection under the passenger side fuel rail cover like Jim suggested. Personally I would take the ICM off and have it heat cycled and checked at an Autozone. Be sure they heat it up good when testing.
ps-key on, car off fuel pressure shouldbe about 43psi, engine running 38-39 psi.
ps-key on, car off fuel pressure shouldbe about 43psi, engine running 38-39 psi.
Race Director
Joined: May 2008
Posts: 10,742
Likes: 629
From: Manheim Pennsylvania
When I had my fuel pump issue, I only checked it in the garage when the systems were cold. The problem didn't show up until the fuel pump warmed up to operating temperature, I think it is a vane type pump, when the housing expanded it lost the ability to pump. What gave me the idea that the fuel pump might be the problem was when the fuel tank was full the engine didn't stall. I finally parked the car on a steep ramp, with the fuel tank lower than normal, the engine exhibited all the signs of fuel starvation. I replaced the pump, problem solved. This troubleshooting took weeks to solve, I really was ready to trade the car.
Drifting
Joined: Nov 1999
Posts: 1,502
Likes: 12
From: Yorktown Heights NY
Did you find the problem yet?
See the following post on my car in the tech/performance area for testing link to check this out:
http://forums.corvetteforum.com/c4-t...ay-arrrgh.html
See the following post on my car in the tech/performance area for testing link to check this out:
http://forums.corvetteforum.com/c4-t...ay-arrrgh.html
Le Mans Master
Joined: Jul 2009
Posts: 6,381
Likes: 66
From: SF bay area C.A.
C4 of the Year Finalist
My 92 was doing the same thing about a year ago and it was the icm, dont know if thats your problem though. You might want to have it checked out. When it gets hot and if the grease is dried up, it will quit and start again when it cools.