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Now try and guess why the '85 runs like crap

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by thatK30guy, Jun 7, 2002.

  1. thatK30guy

    thatK30guy 1 ton status Premium Member

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    Now try and guess why the \'85 runs like crap

    Seems like no. 6 cylinder is not quite sparking right. Brand new plugs and wires are already on it. Along with a new cap and rotor, too.

    My buddy mechanic is suggesting a vacuum leak on the intake manifold, a bad distributor, and/or bad lifters.

    The truck does not idle smooth at all. It shakes and when you rev the motor up or even accelerate, it shakes until you get to a higher speed or RPM and then it smooths out. But it still does not have power at all after the motor smooths out.

    Anybody have any more ideas now? /forums/images/icons/frown.gif
     
  2. mudrunner78

    mudrunner78 1/2 ton status

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    Re: Now try and guess why the \'85 runs like crap

    had a similar problem in my 78 dually that I owned awhile back. Turned out I had a leak in my new manifold, it has a small amount of warp to it. I had it planed and it worked great, then out went my vacum advance, which made me think my manifold was warped again, but spraying carb and choke cleaner helped me fing the problem. Jesse
     
  3. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Re: Now try and guess why the \'85 runs like crap

    Have you done a compression test yet? How about valve lift on that cylinder?

    Rene
     
  4. dyeager535

    dyeager535 1 ton status Premium Member

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    Re: Now try and guess why the \'85 runs like crap

    I actually didn't notice that I had one bad plug wire...not to the extent you are saying. i like the "pull one wire at a time" test to narrow down which cylinders are causing problems, but it kinda sounds like you have. Spark is fairly easy to check at the plug end also, wouldn't hurt to watch and see what its doing. Hard to judge a weak spark, but generally, if its firing consistently, its ok. Don't rule out crappy plugs either, hence the spark check. Had 2 of 8 brand new plugs die in 40 minutes of idling. Teach me to buy Autolites. : )
     
  5. MudNurI

    MudNurI 1/2 ton status

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    Re: Now try and guess why the \'85 runs like crap

    <font color="purple"> It sounds to me like you and Steph have the same problem...You might want to check her post and see what she did to fix it- if she has found it yet. Or at least with eliminating things she has alread fixed and its still not right??? Just a thought.

    Brandy </font color>
     
  6. thatK30guy

    thatK30guy 1 ton status Premium Member

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    Re: Now try and guess why the \'85 runs like crap

    Rene, yeah, compression test came back at between 120-125 on all cylinders.
     
  7. thatK30guy

    thatK30guy 1 ton status Premium Member

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    Re: Now try and guess why the \'85 runs like crap

    Don't you ever get tired of changing spark plugs all the time? /forums/images/icons/tongue.gif

    At least doing this is cheaper than replacing a major part on the motor. /forums/images/icons/wink.gif
     
  8. thatK30guy

    thatK30guy 1 ton status Premium Member

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    Re: Now try and guess why the \'85 runs like crap

    Brandy, where is this thread at? /forums/images/icons/confused.gif
     
  9. NITRO

    NITRO 1/2 ton status

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    Re: Now try and guess why the \'85 runs like crap

    you may also want to check all of your rods or at least the one on cylinder 6. if one rod is even 1/8" shorter, it will cause it to run like ur explaining. hope ya find it bro.

    NITRO
     
  10. MudNurI

    MudNurI 1/2 ton status

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    Re: Now try and guess why the \'85 runs like crap

    steph's shakin truck

    Boy I hope that link worked. this is funky UBB stuff!

    Brandy /forums/images/icons/grin.gif
     
  11. Storm Trooper

    Storm Trooper 1/2 ton status GMOTM Winner

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    Re: Now try and guess why the \'85 runs like crap

    I Think the monkeys that stole your underwear are messing with it! /forums/images/icons/laugh.gif /forums/images/icons/wink.gif
    So is #6 fouling out? Might want to pull the valve cover and check the rockers and push rods. Might have flated a end on that one.
     

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