2002 Pontiac Grand Prix stalls when slowing/starts-dies-sta

Tiny
RACKTRACK
  • MEMBER
  • 2002 PONTIAC GRAND PRIX
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 84,000 MILES
The car has new plugs and fuel filter
Starts and runs fine when cold.
When hot it will start, almost run, rpms real low,
dies and when restarted runs great. It has just
started to occasionally dies when slowing down
to stop.
Do you
have the same problem?
Yes
No
Thursday, February 11th, 2010 AT 5:22 PM

3 Replies

Tiny
SERVICE WRITER
  • EXPERT
Okay, we are going to go down a bit of a backyard technique but it should flush out our offender.

Problems that only happen when hot take on a different kind of diagnosing. Getting it hot to the point of fialure, will give you time to lower the temperature of a part that is bad when hot.

You need to keep some cool water with you in a zip lock bad or similiar.( Some guys just pour the water). Three components that you need to cool off and restart the engine are the ignition Module, crank sensor or the
Computer. I would pour the water on the ignition module first then try to start it. If not go to the crank sensor. Lastly the computer. But I would keep water in the baggie and put it on to cool it. Or pull it and put it out side if it is cold out.
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Thursday, February 11th, 2010 AT 7:26 PM
Tiny
RACKTRACK
  • MEMBER
I believe you misunderstood my problem. It never gets above operating temperature. When started cold it starts and runs fine. When you try to start it after it is at operating temp the engine starts-rough idle low rpm then dies. When it is restarted it runs fine. It has just occasionally started to die when slowing down to stop. There are no trouble codes in computer.
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Friday, February 12th, 2010 AT 11:02 AM
Tiny
SERVICE WRITER
  • EXPERT
I did miss the restarts and runs fine part. When I said hot, I meant at operating temperature.

In lieu of this, I would get a fuel gauge hooked up and drive it until it stalls, monitoring the fuel pressure. What may be happening is the sock is plugging while it is sucking. When the stall happens the sucking stops and sediment drops off.

I would also check the throttle body for a carbon build up and clean the throttle bore with a good cleaner and plastic brush.

Another thing that can be happening is a bad MAF. TRy unplugging it and driving it to se if the symptoms change.
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Friday, February 12th, 2010 AT 2:36 PM

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