2004 Pontiac Grand Prix cold start

Tiny
R FONSECA
  • MEMBER
  • 2004 PONTIAC GRAND PRIX
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 57,735 MILES
It does not happen all the time but occasionally on a cold start the vehicle starts then it fails to keep running or it stumbles and then runs. Does not do it after at all after this. Is this common to these cars? Any thing I can see or check?
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Friday, March 6th, 2009 AT 11:47 AM

1 Reply

Tiny
MMPRINCE4000
  • EXPERT
No this is not normal. Could be many things, but start by checking the fuel pressure with mechanical gauge.
Fuel pressure should be above 40psi and hold pressure when pump is off. Test with ign. On, do not start, pump will run a few seconds and shut off, if pressure on gauge falls quickly, then a leaking injector, cold start valve or fuel pressure regulator.
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Wednesday, March 11th, 2009 AT 9:22 AM

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