1987 Pontiac Sunbird Compression Problems

Tiny
DANSIDANS
  • MEMBER
  • 1987 PONTIAC SUNBIRD
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 112,000 MILES
My car has slowly been leaking oil from the bottom passenger side of the engine after running (while idling almost no oil leaks) and had a slight tick(thought it was a stuck lifter but hadnt checked it out I have had this car only 10 days). After a hour long trip directly into 55+MPH winds the car stalled out when the speed reduced. It would not start so I had it towed home. I checked and have spark and fuel so I performed a dry compression test and got readings of 70-60-60-40. The top half of my engine is virtually spotless, with no oil or other fluids. Now my question is this:
Is this most likely my head gasket?
Or is it the piston rings?
and should I not waste my time?
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Monday, April 12th, 2010 AT 10:45 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • EXPERT
That is really low. If it was a head gasket, most likely it would be only one or two cylenders, not all. Have you tried a wet compression test? If not, try it to see if the compression goes up. If it does, you need a valve job.

Let me know what you find.
Joe
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Monday, April 26th, 2010 AT 1:44 PM

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