1989 Pain In The Rear - NCRS Discussion Boards

1989 Pain In The Rear

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  • Justin B.
    Expired
    • March 1, 1996
    • 478

    1989 Pain In The Rear

    If I had a really big cliff I probably would have pushed this thing down it at least a dozen times. I can't get cylinder number six to run. The reason I say "get it to run" is because no matter what i do, it misses on that cylinder. It gets fire, I put all new fuel injectors in it, new mass air flow sensor, throttle positiion sensor, plugs, GM plug wires, computer, battery tested good BOTH times that i took it to be tested and the same for the altenator. I also replaced the distributor cap, ignition module, etc.
    When I crank it and let it idle you can hear the miss but it doesn't sound terrible. Sometimes when you rev it up it backfires through the aircleaner. The timing hasn't ever been touched and the timing light shows it to be dead on. I have checked to make sure that the plug wires aren't crossed (at least 1/2 dozen times) and they aren't. It doesn't smoke or burn any oil. However, the first owner removed the front cats. and I gutted the second because the internals were rattling. The car ran just fine without the cats before all of this mess started. I have checked for vacuum leaks with no success.
    This was the first Corvette that I owned back in high school. I bought it back and everything has been fine up until the last couple of months when it started acting up. So, does anyone have any input other than for me bring it to your house and push it down your hill?
  • Terry M.
    Beyond Control Poster
    • September 30, 1980
    • 15599

    #2
    Re: 1989 Pain In The Rear

    A compression test of all cylinders might also be interesting, and a whole lot less expensive than throwing parts at it.

    Edit add: A cylinder leak down test might even tell you more if the true mileage is over 200K.
    Last edited by Terry M.; August 5, 2012, 11:58 AM. Reason: Additional info provided by OP
    Terry

    Comment

    • Justin B.
      Expired
      • March 1, 1996
      • 478

      #3
      Re: 1989 Pain In The Rear

      I'll give a shot, thanks!

      Comment

      • Justin B.
        Expired
        • March 1, 1996
        • 478

        #4
        Re: 1989 Pain In The Rear

        Thats not a bad idea either. The odometer says 67k miles but its probably 267k

        Comment

        • Paul J.
          Expired
          • September 9, 2008
          • 2091

          #5
          Re: 1989 Pain In The Rear

          Originally posted by Justin Beck (27359)
          Thats not a bad idea either. The odometer says 67k miles but its probably 267k
          I agree with the others that you probably have an internal valvetrain issue. If you are correct that it is 267k miles, then you're way past due for an engine rebuild.

          Paul

          Comment

          • Justin B.
            Expired
            • March 1, 1996
            • 478

            #6
            Re: 1989 Pain In The Rear

            It has 67K miles, not 267k, that was my sarcasm. However, I agree with you. Do you think it would be an intake or exhaust valve? Thanks Paul

            Comment

            • Terry M.
              Beyond Control Poster
              • September 30, 1980
              • 15599

              #7
              Re: 1989 Pain In The Rear

              Originally posted by Justin Beck (27359)
              It has 67K miles, not 267k, that was my sarcasm. However, I agree with you. Do you think it would be an intake or exhaust valve? Thanks Paul
              Cylinder leak down test will tell you which.
              Terry

              Comment

              • Edward J.
                Extremely Frequent Poster
                • September 15, 2008
                • 6942

                #8
                Re: 1989 Pain In The Rear

                I can add one more thing to check if the compression is okay. pull the injector lead off and make sure its has a signal from computer. if you have a volt meter or test light this can be done. A test light will require a few jumper leads. I like the post on the cam problem, If the cam lobe is wiped out this will make a popping noise and will be heard through the air cleaner snorkel.
                New England chapter member, 63 Convert. 327/340- Chapter/Regional/national Top Flight, 72 coupe- chapter and regional Top Flight.

                Comment

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