1999 Pontiac Grand Prix cold starting

1999 PONTIAC GRAND PRIX
200,000 MILES • 6 CYL • FWD • AUTOMATIC
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PAT KEEGAN
  • MEMBER
  • 1 POST
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?
May 15, 2009 at 12:49 AM
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MMPRINCE4000
  • ✓Experienced 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.
May 15, 2009 at 1:39 AM
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