WHAT SHOULD THE COMPRESSION BE AND HOW DO I KNOW I SET THE TIMING CORRECTLY?

  • Tiny
  • mblad
  • 1996 Plymouth Neon

The water pump froze so I had to replace it and the timing belt now the car starts but spits and spudders. There was marks for the timing that I had lined up. How do I know if it is correct or is it doing this because the compression is bad since maybe some valves got bent. How do I check this?

Thursday, May 31st, 2012 AT 3:38 PM

3 Answers

  • Tiny
  • Wrenchtech
  • Expert
  • 19,808 posts

Very likely on the bent valves. You need to be over 100PSI and all within 10% of each other.

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Thursday, May 31st, 2012 AT 3:55 PM
  • Tiny
  • Docfixit
  • Expert
  • 18,991 posts

Check compression 170-225 psi but engine is a valve bender so VERY likely valves were bent

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Thursday, May 31st, 2012 AT 3:56 PM
  • Tiny
  • Wrenchtech
  • Expert
  • 19,808 posts

Doc is correct according to spec. What I posted was the minimum to avoid misfire. Looks like you can have up to 25% different between cylinders too.

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Thursday, May 31st, 2012 AT 4:01 PM

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