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Engine Weirdness

Discussion in 'Chevy Trucks' started by 79scotts, Mar 29, 2002.

  1. 79scotts

    79scotts Junior Member
    Messages: 6

    I have a 79 k-10 with a 350. Under medium and heavy acceleration at lower speeds I get a strange vibration from the engine as if there was a cylinder not firing correctly. I have little or no blowby so I don't think that it is a compression problem.
    I have also changed plug wires, plugs, cap, and rotor.
    I still can't locate the cause of this problem. I suspect that I may have a slightly bent pushrod due to a formerly sticking lifter but that's only a semi-educated guess. If anyone has any ideas please email me or reply to this post.

    Thanks Gang,
    -Rob
     
  2. DaveK

    DaveK Senior Member
    Messages: 420

    A slightly bent push rod would not cause a noticeable vibration.

    Is it a manual or automatic?

    What is the RPM at the time it gives you a vibration?
     
  3. 79scotts

    79scotts Junior Member
    Messages: 6

    Here's the latest. I have checked all the plugs and found that the #6 cylinder is the culprit. I have checked compression and spark and they are fine. Actually the compression in #6 was 180lbs, about 20lbs higher than the rest. I have also changed the plug and it didn't have any effect. What is going on here?
     
  4. MTCK

    MTCK Senior Member
    Messages: 346

    What made the #6 plug the culprit? Fowled with oil, or had it been struck by something? Give us a little history about the engine and truck's drivetrain. Something easy is also check that you don't have any burnt plug wires. Give us a little more to work with and we'll figure it out.

    Marcus