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Compression Question

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    Topic
  • #996100
    Dodge GuyRandy hamilton
    Participant

      2006 Dodge Caravan with low miles.
      Compression on cylinder #2 (Pass Side front) is 150 cold and 150 hot
      Compression on cylinder #4 (middle front) is 135 cold and 150 hot
      Compression on cylinder #6 (Driver side front) is 45 cold and 150 hot.

      Car runs great, gets get gas mileage, oil color and texture normal. Coolant is normal.

      What do you think. Normal?

    Viewing 6 replies - 1 through 6 (of 6 total)
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    • #996101
      Dodge GuyRandy hamilton
      Participant

        Cyl #1 – 150 Engine Warm
        Cyl #3 – 150 Engine Warm
        Cyl #5 – 153 Engine Warm (rear driver side) not tested hot

        Doesn’t seem to be consuming oil or water

        #996174
        Dodge GuyRandy hamilton
        Participant

          Compression tested ~150 psi on all cylinders today (cold)

          Unclear why the low reading several days ago. Perhaps a sticking valve or ring.

          #997899
          hondaguy453hondaguy453
          Participant

            Hello, Randy! Did you have a P0306 and that’s why you tested compression, or were you checking for your own peace of mind? As you mentioned, it could have been a sticky valve which usually stems from carbon buildup. You can try using some seafoam to clean the carbon out.

            #997905
            EricTheCarGuy 1EricTheCarGuy
            Keymaster

              Compression test really don’t tell you much. A leak down test is much more informative in my view. I only do compression tests when looking for a dead cylinder. If you don’t have a misfire, or any codes, and the engine runs fine, you’re probably fine. The discrepancies are likely due to testing errors.

              #998054
              Dodge GuyRandy hamilton
              Participant

                Thanks.
                I just drove the vehicle on a 2000 mile road trip with no issues. Gas mileage as expected or slightly better for a V6 and a loaded vehicle at approximately 4600lb gross.
                Seems to have been a testing failure rather than an engine component failure.

                #998147
                EricTheCarGuy 1EricTheCarGuy
                Keymaster

                  Thank you for the update. Glad it worked out.

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