1966 L79 Wild Bucking - NCRS Discussion Boards

1966 L79 Wild Bucking

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • Marc K.
    Infrequent User
    • July 6, 2011
    • 18

    1966 L79 Wild Bucking

    I noticed an occasional engine sputter during summer driving season. It got slightly worse each time I drove. Now, I can't drive it at all. I was lucky to get it back in my garage. I can start it, but it won't hold an idle unless I keep giving it gas. I took the carb to my carb guy and he said it looks fine. I tested the coil and it failed one test so I replaced it with a NOS one. I re-seated the spark plug wires. I had the fuel pump and fuel sender units rebuilt. I replaced the fuel inlet filter. I'm still thinking carb. Fuel or ignition? All opinions are appreciated.
  • Keith B.
    Extremely Frequent Poster
    • September 15, 2014
    • 1575

    #2
    Re: 1966 L79 Wild Bucking

    Did you do the basics of checking the timing, dwell, points, check the rotor and cap for cracks?

    Comment

    • Marc K.
      Infrequent User
      • July 6, 2011
      • 18

      #3
      Re: 1966 L79 Wild Bucking

      Unfortunately, I can't hold an idle to check the timing and dwell. I turned both mixture screws to 1.5 turns open. I initially thought this was the problem. I pulled the distributor cap off and all looks good. It had a complete tune-up 1,100 miles ago that included new plugs, plug wires, distributor cap and rotor, points, condenser, dwell and timing adjustments. The carburetor was rebuilt not too long ago.

      Comment

      • Keith B.
        Extremely Frequent Poster
        • September 15, 2014
        • 1575

        #4
        Re: 1966 L79 Wild Bucking

        Have you checked for vacumn leaks. Take a mity vac and see if the vacumn advance can will hold vacumn

        Comment

        • Jim D.
          Extremely Frequent Poster
          • June 30, 1985
          • 2882

          #5
          Re: 1966 L79 Wild Bucking

          Originally posted by Keith Brodbeck (60464)
          Have you checked for vacumn leaves.
          I agree. After all, it is fall and one one must check for leaves.

          Comment

          • Rich G.
            Extremely Frequent Poster
            • August 31, 2002
            • 1396

            #6
            Re: 1966 L79 Wild Bucking

            Had similar issue with my 68 BB. Turned out to be a bad coil wire, the high tension side. It’s a long shot, but easy to change. I’m suspicious of some of the new wire sets available. Have you looked at the motor running in a low light situation to see if any arcing is going on?
            1966 L79 Convertible. Milano Maroon
            1968 L71 Coupe. Rally Red (Sold 6/21)
            1963 Corvair Monza Convertible

            Comment

            • Darryl D.
              Very Frequent User
              • February 7, 2017
              • 386

              #7
              Re: 1966 L79 Wild Bucking

              You may want to add some "Heat" to your gas tank, sounds like it could be water in your gas.

              Comment

              • Marc K.
                Infrequent User
                • July 6, 2011
                • 18

                #8
                Re: 1966 L79 Wild Bucking

                I appreciate all of the feedback. I started trying easy things first like changing the coil wire. I recalled having bad gas back in the 80's that had similar symptoms and I was considering draining the tank again. I then read a CC Tech article and found the following, "A loose or bad condenser can make your car almost impossible to drive, the engine will buck like a wild horse or make your engine start and stop without warning."
                Last time I drove my car, it bucked like a wild horse.
                A couple of days ago when I checked the cap and rotor, I made sure the condenser was tight. Today, I removed the cheap Chinese ignition condenser and replaced it with an old AC Delco one that I had sitting around. That did the trick! Unfortunately, I couldn't drive it as it is raining in Seattle.

                Comment

                • Rich G.
                  Extremely Frequent Poster
                  • August 31, 2002
                  • 1396

                  #9
                  Re: 1966 L79 Wild Bucking

                  Good news. Thanks for letting us know. Hope it stops raining soon!

                  Rich
                  1966 L79 Convertible. Milano Maroon
                  1968 L71 Coupe. Rally Red (Sold 6/21)
                  1963 Corvair Monza Convertible

                  Comment

                  Working...

                  Debug Information

                  Searching...Please wait.
                  An unexpected error was returned: 'Your submission could not be processed because you have logged in since the previous page was loaded.

                  Please push the back button and reload the previous window.'
                  An unexpected error was returned: 'Your submission could not be processed because the token has expired.

                  Please push the back button and reload the previous window.'
                  An internal error has occurred and the module cannot be displayed.
                  There are no results that meet this criteria.
                  Search Result for "|||"