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2003 Pontiac Grand Prix Won't start every time

Tiny
GROUSE
  • MEMBER
  • 2003 PONTIAC GRAND PRIX
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 80,000 MILES
My 03 3.1 Grand Prix SE will start fine for days then out of the blue it will try to start & kind of belch under the hood then it won't try to start at all & will not without giving it gas. It will then start but about half the time won't run bt itself & will die w/o giving it the accelerator & running it at higher RPM's for a while. I've had the fuel filter & plugs changed & the fuel pump pressure is OK. But then it won't do it in front of a mechanic. No codes are shown.
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Thursday, September 24th, 2009 AT 4:05 PM

1 Reply

Tiny
MMPRINCE4000
  • MECHANIC
  • 8,549 POSTS
It sounds to me like a timing issue, a crank or cam sensor, since you mentioned the "belch" and that the fuel pressure is good.

When this happens, look at tach and see if it is reading any RPM, if reading 0 rpm, it would be the crank or cam sensor.
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Thursday, September 24th, 2009 AT 5:35 PM

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