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Checking compression procedure 850

uid 5322's pic
posted by  alschnertz on  Thu Mar 21 19:15 CST 2013
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last visit: Fri Oct 24 10:32 CST 2014
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I've come to realize that I've never had to check the compression on a car that has fuel injection or even a computer.

So I figured for the 854T I'll pull the fuel pump relay while I'm checking the compression. But is there something else I should disconnect so the computer doesn't think that the car is misfiring? Still crank it with the throttle wide open, right?

I'd hate to have it set a CEL because of my compression test, but I suppose it's easy enough to erase it anyway.
--
"Differences of opinions should be tolerated, but not if they're too different" - Sharon Craig








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    Checking compression procedure 850

    uid 5322's pic
    posted by  alschnertz on  Tue Mar 26 09:08 CST 2013
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    last visit: Fri Oct 24 10:32 CST 2014
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    Well the pressure is off for now.
    She took it to be emissions tested yesterday and it passed.

    Still will have to investigate why this car is using so much oil.
    I wonder if the issue is a clogged PCV. There is some blow-by from the dipstick tube - not a lot, but I suppose there really should not be any. Maybe excess crankcase pressure is causing the excess consumption.

    Many ideas, but not enough time to investigate right now, sigh.
    --
    "Differences of opinions should be tolerated, but not if they're too different' - Sharon Craig








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      Checking compression procedure 850

      posted by  KlausC on  Tue Mar 26 11:01 CST 2013
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      last visit: Fri Oct 24 10:15 CST 2014
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      Read through the following:

      http://www.matthewsvolvosite.com/forums/viewtopic.php?t=28415&f=1

      I did not remove the PCT nipple from the intake, a small flashlight works wonders. I used a very small screwdriver to scrape the crud off and TB cleaner to get off the oil. Getting the intake pipe out of the engine bay was much easier than putting it back on - cover the fender with an old towel so you don't scratch it all up.

      I have to chuckle everytime I see Jblackburn's photo trying to lift the manifold, not realizing the support bracket bolt is still attached!

      --
      My name is Klaus and I am a V♂lv♂holic








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    Checking compression procedure 850

    posted by  KlausC on  Fri Mar 22 09:43 CST 2013
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    last visit: Fri Oct 24 10:15 CST 2014
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    With the coil pulled and plugs out, the engine will not start and no CEL will turn on.

    Do warm the engine for 1 minute or so, otherwise the rings could be without oil and skew the numbers to a very low level. Consistancy between all 5 numbers is what you want.

    If you do use a cold engine, do it twice. The second time, add 1 tablespoon of oil to each cylinder so the rings get coated.

    I do not expect your engine to have ring problems, quite rare with the 5 cyl engines.
    --
    My name is Klaus and I am a V♂lv♂holic








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    Checking compression procedure 850

    posted by  someone claiming to be bob on  Fri Mar 22 07:44 CST 2013 [RELATED]

    I would recomend unplugging the coil so you don't get "bit"








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    Checking compression procedure 850

    posted by  someone claiming to be fixit2002 on  Fri Mar 22 07:10 CST 2013 [RELATED]

    No need to open the throttle the IAC valve should open and allow air into the engine. I have a '95 and no codes were made after I did measured mine.







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