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  1. #1
    Rende's Avatar
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    How to perform a compression test

    How to I perform a compression test on 4 tec 155 engine?


  2. #2
    boost junkie skidoochris's Avatar
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    buy a comp test kit with the 10mm plug hole adapter http://www.toolplanet.com/product/Ga...FY87MgodgisANA
    take out all the plugs screw in the tester hold throttle WFO and crank it over until gage stops climbing (about 5 seconds)
    write down the number and repeat a few time every hole until your sure

  3. #3
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    why do you remove the other two plugs? why not just remove the coil packs. i know on 2 strokes you do not remove all of the plugs, not sure on 4tecs

  4. #4
    And if you get really low numbers on one or two cylinders, try to add a tablespoon of oil down the plughole and test it again. If the numbers go up its an indication that your rings is worn.

    The most important thing when doing a compressiontest is to see that all 3 cylinders have the same compression.

  5. #5
    Quote Originally Posted by thatdude596 View Post
    why do you remove the other two plugs? why not just remove the coil packs. i know on 2 strokes you do not remove all of the plugs, not sure on 4tecs
    On a 2-stroke you always remove all the plugs!

  6. #6
    boost junkie skidoochris's Avatar
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    remove all plugs just to save battery and they got to come out anyway

  7. #7
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    Quote Originally Posted by martfart View Post
    Quote Originally Posted by thatdude596 View Post
    why do you remove the other two plugs? why not just remove the coil packs. i know on 2 strokes you do not remove all of the plugs, not sure on 4tecs
    On a 2-stroke you always remove all the plugs!
    Never ever seen a compression test done like that on a 2 stroke. We remove the wires but not the plugs

  8. #8
    83Gator's Avatar
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    As I'm considering doing this in the next few days (4Tec)... I was told to have the engine warmed up. Maybe run it on the hose for a few minutes?

    Also, you can get a "loaner" compression test kit from Auto Zone. Requires a deposit, but it's returned when the kit is returned.

  9. #9
    shrabber's Avatar
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    I would do a cold test compression or sure never a warm up ever. If your trying to figure a problem and you have oil leaking internally you get false readings.

  10. #10
    Hmm, I always thought "warm" was the way to go. And I leave my other 2 plugs screwed in during testing, just because I feel like I'll get a more true "pop" or push from those 2 cylinders while testing the 3rd....although, I'm not sure if that holds any weight in the "real world".

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