96 ranger 3.0 no compression cyl 1

Discussion in '1993 - 1997 Ford Ranger' started by joncf, Feb 13, 2013.

  1. joncf

    joncf New Member

    I recently bought this mazda (ranger) 4x4 3.0 ltr w/94k with a engine miss. turns out there is very little to no compression just in that cylinder. engine was compression tested and also performed a air leak test with no leaking at all . pull the valve cover off and all valves rods are moving like they should. We next took the plenum off to check for air restriction and it looked ok.
    also the engine does not smoke and make any noises. We are at a stand still right now. We talked to someone and they said possibly valve timing off.

    anyone have any suggestions?
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  3. Diablo

    Diablo New Member

    well with no compression, either a valve is bent not closing all the way, ring is bad, threads for the spark plug are messed up and leaking there. not good
  4. adsm08

    adsm08 New Member

    A bad valve or messed up plug should show in a leak down test. I don't know how you loose one cylinder from bad valve timing in a pushrod engine, that should be an all or nothing deal there. Rings or fuel wash would be my first suspect.

    Did you do a wet compression test after the initial and see if it came up any?
  5. OP

    joncf New Member

    with the valve cover off I can see everything moving like it should. Also we did the leak down test with all the plugs out a tdc valves closed and NO air loss with 35psi.
    Right now I am soaking the cylinder with marvel and rotating it by hand. and hoping the ring will free up if that is problem. Just about ran out of ideas.
    Also the truck sat for about a year when I bought it thats why I am leaning towards stuck ring.
  6. OP

    joncf New Member

    my bad the leakdown with all plugs in except air fitting... compression test all plugs off...
    anyway what exactly is the fuel wash
  7. adsm08

    adsm08 New Member

    Fuel wash is when you get too much raw gas into the cylinder, from either a lack of spark, or a leaking injector. It gets into the metal and causes the rings to not seal properly.

    A minor case will cost you between 5 and 20% and can usually be cleared up by fixing the issue, changing the plug and oil and running the piss out of it.

    A major case requires new rings on the dead cylinder. The real problem is that once the cylinder drops below 90 PSI it can't fire and so it can't clear itself.
  8. OP

    joncf New Member

    Ok ... The prior owner probably ran it like that for a while without fixing possibly fuel problem. I am just wondering why when we did the leak down test we could not tell the ring damage.
    I guess soaking cylinder right know is only option then. thanks
  9. adsm08

    adsm08 New Member

    Leave it sit for a day. Then do your compression test on that cylinder again, take your reading, and then add a tablespoon of oil to the cylinder through the plug hole. Repeat test. If the reading bumps a lot, you have a ring issue.

    A leak down test looks for big holes. 35 PSI won't be enough to get past the rings in any state of crappiness.
  10. OP

    joncf New Member

    ok will do .. thanks
  11. Scrambler82

    Scrambler82 Old Guy User

    Have you had the injectors tested ?
  12. OP

    joncf New Member

    the injectors are least of my worries right now
  13. adsm08

    adsm08 New Member

    Do tell, what would that accomplish right now?

    He has no compression. A bad leak from an injector could cause fuel wash, which can kill compression, but usually leaves more than 0.

    One thing I haven't considered until today, head gasket. But that would probably show in another cylinder or a leak down.

    Injector test has nothing to tell us right now since we know there is a big compression issue.
  14. OP

    joncf New Member

    guess I'll start to take head off to find out. its really starting to annoy me
  15. OP

    joncf New Member

    burnt exhaust valve #1

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