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1999 Pontiac Grand Prix cold starting

Tiny
PAT KEEGAN
  • MEMBER
  • 1999 PONTIAC GRAND PRIX
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 200,000 MILES
Have problems starting in cold weather (below 10C).
Car starts but in a second or two it stops. When it is warm and running the rad cooling fans don't come on. If I disconnect the engine temperature sensor, cold starting is good and coolong fans run. Engine light is on and two engine codes show up PO102 and P0118. Can you help?
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Friday, May 15th, 2009 AT 7:49 AM

1 Reply

Tiny
MMPRINCE4000
  • MECHANIC
  • 8,548 POSTS
Codes indicate a Mass Air Flow/or MAP sensor error.

Try cleaning it first, you can buy MAF sensor cleaner at most autoparts stores.

If problem persists, then I would get a used MAF/MAP from a junkyard and try it. New or rebuild ones are not cheap.

If you have access to scan tool, then check reading of MAFMAP in live data mode. If MAF/MAP readings stay stagnant, then MAF/MAP would be cause.
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Friday, May 15th, 2009 AT 8:39 AM

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