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Frustrated

Tiny
JIMBOHONCH
  • MEMBER
  • 2004 PONTIAC GRAND PRIX
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 73,000 MILES
2004 grand prix. P0300, overheating, white smoke from exhaust, slight hesitation during acceleration for 10min, after 10min becomes severe with whirling noise (not supercharger). Dealership replaced one ignition coil, spark plugs, and cat is not the issue. Second time they've tried to fix it but I guess they forgot to check after installing new part.
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Friday, December 10th, 2010 AT 2:51 AM

2 Replies

Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
White smoke is usually steam or raw gas. Overheating would point to steam. Losing anti freeze? Maybe bad head/intake gasket? Cracked head?
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Friday, December 10th, 2010 AT 5:10 AM
Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
P0300 random misfire. If steam out back should drip more water from pipe than usual even after warm.
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Friday, December 10th, 2010 AT 5:13 AM

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