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compression for 5.0

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    #1

    compression for 5.0

    ok so i bought the f 150 that i talked about a couple weeks ago. i was going thru and doing all the plugs and wires looking hoping it was just a down plug or wire as i was changing all the stuff i was compression testing all the cylinders most of them came out around 120 ish but i had one as high as 150+ what is the compression supposed to be on those.

    and it does have a bad valve in the #5 position my compression in that one is only like 55.
    thanks
    seb
    Sellin off toys... need money for the dodge!
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    #2
    150+ is normal. 120 is kind of low. If there was oil laying in a cylinder it will make the compression on that particular one show way high, possible thats what happened.
    86 Lincoln Town Car (Galactica).
    5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

    91 Lincoln Mark VII LSC grandpa spec white and cranberry

    1984 Lincoln Continental TurboDiesel - rolls coal

    Originally posted by phayzer5
    I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

    Everything looks like voodoo if you don't understand how it works

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      #3
      The fact that it has one bad valve, though, makes me think that maybe the low compression on all the cylinders is because of valves that aren't exactly bad, but kinda iffy. Try dumping a little oil down each spark plug hole and do your compression check again. If it improves, you've probably got ring problems, if not, I'd be looking at valves.

      You're gonna end up doing a complete valve job anyway because of the one bad valve, and I'd be willing to bet that takes care of it.

      2001 Ford Crown Victoria P71 - "The Fire Engine"
      1985 Lincoln Town Car Signature Series
      But God demonstrates his own love for us in this: While we were still sinners, Christ died for us. Romans 5:8

      Comment

        #4
        Originally posted by Nathan in MN View Post
        The fact that it has one bad valve, though, makes me think that maybe the low compression on all the cylinders is because of valves that aren't exactly bad, but kinda iffy. Try dumping a little oil down each spark plug hole and do your compression check again. If it improves, you've probably got ring problems, if not, I'd be looking at valves.

        You're gonna end up doing a complete valve job anyway because of the one bad valve, and I'd be willing to bet that takes care of it.

        not really its my pos beater i'm just gonna put one valve back in there and drive it like that!
        Sellin off toys... need money for the dodge!

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