Starts and runs then it shuts off after engine has warmed up

NICK RASCHELLA

MEMBER
2005 CHEVROLET COBALT
2.2L
4 CYL
FWD
AUTOMATIC
115,000 MILES

A friend jumped my daughters car, it started and ran, then she noticed the fuel gauge was not working correctly and the speedometer was stuck on 70 mph. So we replaced the speedometer and fuel gauge all is good with that now. The car will start and run then shut off it seems like after getting hot it will start after sitting. We replaced crank sensor then coil tower and control module, still nothing. Any ideas out there that could help me where to go next? We are going to get another computer brain Friday and check to see if it does anything. We are showing no codes also.
Help please!

3 Replies

FREEMBA

MECHANIC
1,152 POSTS

Have the fuel pressure checked. Get a technician (or yourself) to drive the car with the fuel gauge attached to see if the fuel pressure drops after the engine gets hot (after driving thirty minutes or so). If this is the case then the fuel pump is weak and failing after it runs and heats up for a while.

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Wednesday, November 23rd, 2016 AT 6:31 PM

NICK RASCHELLA

MEMBER
2 POSTS

Thanks so much we will try that we did just put a brand new AC Delco fuel pump in the car two weeks before this started.

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Thursday, November 24th, 2016 AT 3:24 PM

KEN L

MASTER CERTIFIED MECHANIC
47,244 POSTS

Hey Nick,

Please start the engine, then open the power distribution center under the hood and wiggle each one of the fuses and relays, We are looking for a bad connection that presents itself once it gets hot.

Please let us know what you find so it will help others.

Best, Ken

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Saturday, November 26th, 2016 AT 8:49 PM