problem restarting
Race Director
Joined: Apr 2004
Posts: 17,066
Likes: 3
From: Milpitas ca
Many years ago I had a similiar problem. My fix was to replace the ECM. As soon as that cooled off everything was fine. Had me parking under trees and near buildings to cool things off sooner
. Replaced ECM (as someone suggested here) and never had that problem again.
. Replaced ECM (as someone suggested here) and never had that problem again.
Le Mans Master
Joined: Jan 2008
Posts: 7,030
Likes: 10
From: Edmonton, Alberta
Jim
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Le Mans Master
Joined: Jan 2008
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From: Edmonton, Alberta
Le Mans Master
Joined: Dec 2000
Posts: 7,839
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From: San Diego, Ca
The ECM uses Coolant Temperature to determine how much fuel to pulse through the injectors (the colder it is, the more fuel it gets) - so see what your Coolant Temp Sensor is showing when it's hot or better yet, what the ECM thinks that temperature is. A scan is the best way to see it, though your Digital Readout will show it. It's also a good idea to see what it is cold; ie, after it has sat overnight. It should be about the same as the outside air temp and real close to the Manifold Air Temp. Then start it up and make sure it rises to the thermostat and when that opens, it should fall back a few degrees, then rise to the threshold for fan operation. Assuming all that works, turn it off and let it sit for a minute or two; then check the signal again before you start it. Most will have risen above the temp when you turned it off - if yours is dramatically lower, I'd replace it. OR if your cold test was dramatically different from the outside air temp, spend 12 Bucks on a new one and simply plug it into the harness - if that shows the correct temp, R & R the old one.
Instructor
Joined: Feb 2005
Posts: 247
Likes: 1
had the same problem turned out to be a bad plug in contact at the fuel pump. try this while your cranking have someone push down on the rear end of the car or take a rubber mallet and give the tires a good whack in other words you have to jolt the car so the plug contact makes contact.when chevy gave me back the old fuel pum the contacts were actually black with carbon good luck
Advanced
Joined: Oct 2009
Posts: 67
Likes: 16
From: Lancaster, Pa
Have you discovered the problem yet? I am new to the forum and I'm sorry to jump on here, but, I'm having a very similar problem with my '92. If you don't mind, when you figure this out, can you let us know? Thanks a lot and Good Luck!
Sounds like it is definitely electrical since the higher temps affect the ignition. When it cools down, everything works as advertised, right?
Sounds like it is definitely electrical since the higher temps affect the ignition. When it cools down, everything works as advertised, right?
Corvette Enthusiast
Joined: Oct 2007
Posts: 6,797
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From: So. Cal.
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Good luck
Corvette Mike
Team Owner
Joined: Mar 2001
Posts: 54,124
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From: Cincinnati, Oh USA
Put a fuel pressure gauge on the shrader valve at the end of the right fuel rail and with the engine hot, shut off the engine and see if the fuel pressure holds up for a long time (1/2 hr). If it falls rapidly, you have leaky injector/s causing a rich mixture and poor idle and black fuel rich smelling exhaust. Injectors don't last forever. Ohmeter tests will only find gross injector coil failures. A turn to turn short in an injector coil cannot be found with an ohmeter but can easily be found with an impedance bridge, which you don't find in auto shops or stores. Your symptoms are correct for leaky injectors.
