1993 Pontiac Grand Am misfire/loss of compression in cylind

Tiny
PGA93
  • MEMBER
  • 1993 PONTIAC GRAND AM
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 171,000 MILES
Hello I have a 93 grand am that ive had for about 2 years I purchased it with a cracked head and a burned gasket replaced both and the car like a junker it loses compression in 3 cylinders but it still runs and it runs great when its cold started after it warms up however it runs terrible and I tuned it up (new plugs new boot plugs converted to cold air intake no map sensor 4 brand new fuel injectors new exhaust had coils chcked had EFU checked) all to no prevail my car still runs bad I did a compression test and found that 2 cylinders are about 15-20 psi off andone was 8 psi off the other was in the 100's I cannot figure out why I am losing compression if the head bolts were stretched I would have water in the block I would think I dont know if the head was possibly installed wrong or could possibly not be for my engine everyone ive talked to has no idea what the problem is and I cant think of what else could possibly be wrong could you give me any insight into the problem
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Tuesday, September 7th, 2010 AT 4:41 PM

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Tiny
MMPRINCE4000
  • EXPERT
The head could be cracked or warped.
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Wednesday, September 8th, 2010 AT 7:58 AM

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