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How much compression should a 91 olds Cutlass 3.1 have

Tiny
LMMOWERMAN
  • MEMBER
  • 1991 OLDSMOBILE CUTLASS
  • 125,000 MILES
This car has a history of shutting off. Would start back up until recently. Replaced fuel pump, fuel filter. Plugs, wires, pvc valve, fuel pressure regulator. Now it starts, idle for 5 seconds and stops. After a couple trys it puffs back through the intake manifold. When doing fuel pressure regulator, put new intake gaskets and new erg valve gasket. When inspecting egr valve the port on the intake was clogged. Used a small screwdriver to punch through. What do you think?
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Wednesday, December 7th, 2011 AT 12:36 AM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Compression should not be lower than 100psi in any of the cylinders. Also, the lowest cylinder should not be lower than 70% of the highest. If it is, you will experience a miss or rough idle.
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Wednesday, December 7th, 2011 AT 12:45 AM
Tiny
LMMOWERMAN
  • MEMBER
  • 2 POSTS
Thanks for your help
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Wednesday, December 7th, 2011 AT 1:43 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Not a problem. Let me know if you have other questions.
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Wednesday, December 7th, 2011 AT 5:47 PM

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