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AARRRGGGHHHH!!!!

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by JunkYardCrawler, Sep 29, 2001.

  1. JunkYardCrawler

    JunkYardCrawler 1/2 ton status

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    i'm working like mad trying to get my rig up and running for the truckhaeven meet. and its one prob after another. where to start. i got a miss in my motor. i think its the number 8. i just put in new plugs and that one is fauled already. i did a comprestion check and all at about 10 and number 8 is at 9. the motor was running good tilli fixed my vacume leak. wtf is going on wiht it?

    Going nowhere everybody is a Moto Psycho
    Got my wheels in motion and i got a path to beat
     
  2. JunkYardCrawler

    JunkYardCrawler 1/2 ton status

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    i am getting a spark out of all 8 wires. so its not there.

    Going nowhere everybody is a Moto Psycho
    Got my wheels in motion and i got a path to beat
     
  3. Pugsley

    Pugsley 1/2 ton status

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    I had a similar problem with a 454 - except it was on #5. It turned out to be a burnt exhaust valve. Try squirting some 30 weight in the hole and run another compression check - see if there's any change.

    Special thanks to those lost from IAFF Locals 94 and 854 - You shall never be forgotten
    <a target="_blank" href=http://pugsley.alloffroad.com>pugsley.alloffroad.com</a>
     
  4. JunkYardCrawler

    JunkYardCrawler 1/2 ton status

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    ok i'll try that after class tomarrow. and if anyone else has anything to try feel free to help out.

    Going nowhere everybody is a Moto Psycho
    Got my wheels in motion and i got a path to beat
     
  5. jimmyjack

    jimmyjack 1/2 ton status

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    Check your plug wires very closely, and maybe run a wqrench over your intake manifold bolts. Just check for a little looseness. I had a bad miss. Half my intake bolts were finger tight!

    That jeep thing? Yah I understand it....... Like my Blazer? <a target="_blank" href=http://community.webshots.com/user/blazerk5>http://community.webshots.com/user/blazerk5</a>
    Jim
     
  6. mike reeh

    mike reeh 1/2 ton status

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    call me crazy but ive heard a lot of people say the oil in the cylinder trick is bogus.. the slightest bit will actually raise compression (like shaving .030 off the heads) and give false readings.. the piston has to be perfectly horizontal and the slightest amount of oil used and only on the rings.

    anyways when I have problems with the rear cylinders, sometimes its the intake manifold vacuum Tee/nipple... if theres a vacuum leak there or theres a lot of air moving thru it, the rear two cylinders get it all making em run lean.. but you say the plug is fouled? that wouldnt happen by running lean, right?.. maybe your intake gaskets are messed up, leaking oil into that cylinder, fouling the plug and making it not fire.. is the plug wet with fuel or oil? hmm..
     
  7. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    The theory I was taught about using a bit of oil in a compression test was this. Do a dry test first and record the numbers. Add a little oil to a cylinder that was low and do another test. If the numbers go up the rings are worn and the oil serves to seal them up a bit. If the numbers stay the same there is a loss at the valves.

    Rene

    <font color=green>Dyslexics of the world...UNTIE!</font color=green>
     
  8. Pugsley

    Pugsley 1/2 ton status

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    That's the same theory I was taught - quick way to rule out rings.

    Special thanks to those lost from IAFF Locals 94 and 854 - You shall never be forgotten
    <a target="_blank" href=http://pugsley.alloffroad.com>pugsley.alloffroad.com</a>
     
  9. JunkYardCrawler

    JunkYardCrawler 1/2 ton status

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    its foulded with oil. haven't smelled it to tell if there is gass on it yet.

    Going nowhere everybody is a Moto Psycho
    Got my wheels in motion and i got a path to beat
     
  10. jimmyjack

    jimmyjack 1/2 ton status

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    Stu, check your intake manifold then. Also check your radiator. My intake was sucking water as well!

    That jeep thing? Yah I understand it....... Like my Blazer? <a target="_blank" href=http://community.webshots.com/user/blazerk5>http://community.webshots.com/user/blazerk5</a>
    Jim
     
  11. JunkYardCrawler

    JunkYardCrawler 1/2 ton status

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    i just checked the intake. none of the bolts were lose. my pampaw offered to take it down to have it put on an anilizer. so i'm going to check out some more stuff and if i have no luck then i will take it down.

    Going nowhere everybody is a Moto Psycho
    Got my wheels in motion and i got a path to beat
     
  12. jimmyjack

    jimmyjack 1/2 ton status

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    Are you back in town? Ive been to Redington a few times with a new friend of mine from the kids football team. He's got a nice 85 blazer. When you get it running again we'll go out for a day.

    That jeep thing? Yah I understand it....... Like my Blazer? <a target="_blank" href=http://community.webshots.com/user/blazerk5>http://community.webshots.com/user/blazerk5</a>
    Jim
     
  13. jimmyjack

    jimmyjack 1/2 ton status

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    You know what? We might be doing his front brakes at my house tomorrow afternoon. Maybe you can come over, we'll figure it out. I don't have a compression tester but we can figure something out. Send me a PM or email with your number and I'll give you a shout.

    That jeep thing? Yah I understand it....... Like my Blazer? <a target="_blank" href=http://community.webshots.com/user/blazerk5>http://community.webshots.com/user/blazerk5</a>
    Jim
     
  14. JunkYardCrawler

    JunkYardCrawler 1/2 ton status

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    yeah i'm back in town. my wheeling friend just moved back to colorado so i out a wheeling buddy

    Going nowhere everybody is a Moto Psycho
    Got my wheels in motion and i got a path to beat
     

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