Stalling
Le Mans Master
Joined: Sep 2013
Posts: 6,192
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From: near the thumb in the mitten
Will car restart immediately? FSM? If car has to sit a while with a fuel pressure gauge, spark tester, and a noid light you can determine what failed. If car restarts immediately it will be tougher be sure throttle body is clean, monitor fuel pressure see if flickers.
Le Mans Master
Joined: Sep 2013
Posts: 6,192
Likes: 750
From: near the thumb in the mitten
ICM gets signal from ECM. Lt1 is different opti sends reference signals to to ECM. In turn ECM turns on ICM. Wiring, connectors, ECM, or fauity ICM. Silicon paste should have been applied under ICM when it was installed.
Le Mans Master
Joined: Sep 2013
Posts: 6,192
Likes: 750
From: near the thumb in the mitten
DTC 28 is quad driver 3 fault relates to cooling fans. Won't cause stalling.
DTCs 16, 41,& 42 relate to opti.
When engine stalls will it restart quickly? No check for spark and pulse either or both present. At 4 wire jumper harness
Term A black/red. low resolution
B purple/white. high resolution
C yellow. Ignition feed 12v
D black/pink. Ground
Check for 12 v C body side of connector
Check for continuity D on opti side connector to ground. If both are present - opti or jumper.
DTCs 16, 41,& 42 relate to opti.
When engine stalls will it restart quickly? No check for spark and pulse either or both present. At 4 wire jumper harness
Term A black/red. low resolution
B purple/white. high resolution
C yellow. Ignition feed 12v
D black/pink. Ground
Check for 12 v C body side of connector
Check for continuity D on opti side connector to ground. If both are present - opti or jumper.
Thread Starter
Advanced
Joined: Jun 2018
Posts: 71
Likes: 1
Stalling
My 1993 has been in a shop for ten days with a mechanic that only works on vettes. He has not figured it out. Wou you recommend taking it to a Chevrolet dealership? He has read all of the posts and went through the diagnostics.
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Le Mans Master
Joined: Sep 2013
Posts: 6,192
Likes: 750
From: near the thumb in the mitten
When engine stalls will it restart? Or does it have to sit for a while? Is he using factory manual?
You would want to call Chevrolet dealer to be sure they will work on it. Some dealers won't take pre 2000 cars.
You would want to call Chevrolet dealer to be sure they will work on it. Some dealers won't take pre 2000 cars.
Le Mans Master
Joined: Sep 2013
Posts: 6,192
Likes: 750
From: near the thumb in the mitten
Need to follow A3 no start chart when car stalls. If you want to guess: opti with new jumper. It does sound like you need someone else to look at it; since he hasn't figured it out using factory books
Thread Starter
Advanced
Joined: Jun 2018
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Stalling
Need help. No codes on ECM. Replaced ICM. Bypassed VATS and the 1993 vette starts and runs fine for 15 minutes and stalls suddenly with no notice. Started after 20 minutes and revved to 1800 rpms and shut down.
Thread Starter
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Joined: Jun 2018
Posts: 71
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I had the fuel filter changed as it had not be done ever. My brother in law puchased the new. I got it last June with 41,000 miles. It had all original fluids and hoses.
The closest other place that I found that would work on it is 35 miles away. None of the GM dealers in the area will touch it.
Thanks for the advice
The closest other place that I found that would work on it is 35 miles away. None of the GM dealers in the area will touch it.
Thanks for the advice
Melting Slicks
Joined: Jan 2014
Posts: 2,478
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From: Downers Grove Illinois