Shut off while driving

Tiny
LINDSAY LOOMIS
  • MEMBER
  • 2009 PONTIAC G6
  • 2.4L
  • 4 CYL
  • AUTOMATIC
  • 103,957 MILES
Car started drove bout a mile and shut off while driving. Coasted into a parking lot. Went to start it, started up and shut off just as fast. Had this problem last year. After four times of going into the dealership they finally said it was the computer. New computer put in November 2017. Now this. Acting the same, but when I checked the oil it smells like gas. Oil was changed less then three hundred miles ago. Plugs were changed summer 2017.
Monday, February 12th, 2018 AT 10:31 AM

5 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon.

Fuel in the oil comes from a couple of thing.

Fuel pressure regulator.
Injector not closing and allowing continuing fueling.
Rich running condition.

Roy
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Monday, February 12th, 2018 AT 1:14 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 50,126 POSTS
Hello,

There is a power train control relay that powers the ignition coils for you car which I think has gone bad but we should run the codes first.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

If no codes come up lets test the relay.

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Also check all fuses.

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Check out the diagrams (below).

Please run some tests and get back to us.

Cheers, Ken
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Monday, February 12th, 2018 AT 2:47 PM
Tiny
LINDSAY LOOMIS
  • MEMBER
  • 2 POSTS
Fuses are all good. No codes came up but I was not expecting any either. I have had this issue since September of last year. Every time it shuts off while driving (twenty five to fifty seven mph) and when it gets towed, no codes ever come up. When they replaced the computer in November we have not had a single problem until yesterday. After checking the relay (which was clean, looks new, lit up, clicked) it sat overnight. Went to try it this morning and it started up for about five seconds.
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Tuesday, February 13th, 2018 AT 5:24 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning.

The first thing I would do is check the fuel pressure. Need to be sure the pressure is correct.

You can rent a tester at a parts store is you do not have one.

Roy
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Wednesday, February 14th, 2018 AT 12:30 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 50,126 POSTS
Here is a guide to help you see what you are in for when doing the job:

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

If the fuel pump fails it loses pressure causing the spray to be minimal which does not ignite this is where the fuel smell comes from.
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Wednesday, February 14th, 2018 AT 10:21 AM

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