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Thread: Conducting Engine Compression test

  1. #1
    Join Date
    Oct 2004
    Location
    Malaysia
    Posts
    109

    Default Conducting Engine Compression test

    I am preparing to do the compression test for my car,never done such a thing before, i gathered some info about the procedure,and got some steps to be cleared if possible:

    1- Is it better to disconnect all the coils and spark plugs,or is it better to test one cylinder at a time?
    2- After the fuel system is disabled, and pressing the gas pedal then cranking the engine,do i crank till the gague holds to the highest reading,or there are nomber of strokes should be accomplished; 4,5...?
    3- Are there any cautions or any additional tips for this procedure?

    TIA

    jj

  2. #2
    Join Date
    Dec 2003
    Location
    Eastern Tennessee USi
    Posts
    14,839

    Default

    I disconnected the ECU and removed ALL the plugs and wires (boots on mine). I cranked 3 turns for each cylinder, and when done repeated the test for accuracy. Disconnecting the ecu pretty much insures you wont fry it.
    95 E34 530I V2.37
    ===========
    Those who make peaceful revolution impossible will make violent revolution inevitable.

    John F. Kennedy

  3. #3
    Join Date
    Oct 2004
    Location
    Malaysia
    Posts
    109

    Default

    Finally, today i carried the engine compresion test,as follows:

    1- take the car for a spin till reaching operating temperature
    2- take out fuse 23 till car stalled
    3- disconnect battery
    4- disconnect ECU
    5- disconnect coils and spark plugs
    6- connect the gauge
    7- step on the pedal and give 3-4 cranks

    I was alone doing that,i managed to see the needle jumping with each stroke, all the six cylinders went up to almost 10 BAR ( around 140-145 Psi), the compression didnt hold the needle steady,but after each stroke it went back to (0).

    did i miss anything than having another extra hand around,and are the results satisfactory?

    PS: after all is finished and everything is put back in order,the car operates

    TIA

    jj

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