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Compression test of 2002 Civic GX

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  • Compression test of 2002 Civic GX

    The mileage on our 2002 Civic GX seems to have gone done a little. Also, when driving to Palmdale, CA on the 14 freeway the car can barely climb some of the hills. I decided to compression test the engine and I got the numbers below. Cylinder 3 seems to have a problem. Can anybody lend some experience to this situation? Thanks a lot.



    cyl 1-240 psi
    cyl 2-225 psi
    cyl 3-180 psi
    cyl 4-240 psi

  • #2
    Re: Compression test of 2002 Civic GX

    You can check the valve lash , but if it got too small , the damage is already done. Do a cylinder leak down test to see if you find anything leaking out the intake or ex. ports , crankcase or waterjacket. If nothing found , squirt a little motor oil in 2 and 3 , re-check compression. Looks like the head will have to come off in any case.

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    • #3
      Re: Compression test of 2002 Civic GX

      Number 3 is outside of most industry specs. low cylinder is within 25% of the high cylinder. It is low, but I don't think enough to cause the power loss you are talking about. 180 psi is good for a gasoline engine
      As foar as the oil goes if the pressure comes over 10 to 15 psi you have a ring problem. Little increase 10 to 15 psi it is valves

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      • #4
        Re: Compression test of 2002 Civic GX

        Could the tranny be slipping??
        02 GX

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        • #5
          Re: Compression test of 2002 Civic GX

          Did you do your compression test hot or cold?

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          • #6
            Re: Compression test of 2002 Civic GX

            Thank you to everyone who has responded with suggestions to diagnose this engine. Your experience is invaluable.
            I did the compression test cold the first time, and again hot with a different gauge.
            The hot test had surprisingly high numbers:
            cyl 1-290 psi
            cyl 2-285 psi
            cyl 3-270 psi
            cyl 4-290 psi

            These values have the same trend, but are much better. I will do a leak down test as soon as I get the tool.

            How would I know if the transmission is slipping? The CVT lowers the ratio in such a way that seems like slipping all the time. When the engine is loaded, the ratio changes to bring up the revs.

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            • #7
              Re: Compression test of 2002 Civic GX

              Originally posted by jpatrickuci View Post
              How would I know if the transmission is slipping? The CVT lowers the ratio in such a way that seems like slipping all the time. When the engine is loaded, the ratio changes to bring up the revs.
              See the second file, A07-050.pdf for the Honda diagnosis procedure. I'm not sure how else you could know, unless it gets so bad it becomes obvious...

              http://www.cngchat.com/forum/showpos...6&postcount=12
              02 GX

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