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54 Vacuum fluctuation

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  • Joe R.
    Very Frequent User
    • July 31, 1994
    • 287
    #1

    54 Vacuum fluctuation

    I am tuning my carbs on the 54 and connected a vacuum gauge to the intake manifold to read the idle vacuum. To my surprise, the gauge is reading a rapid fluctuation of between 12 and 19 in/HG. The engine seems to run fine, but I'm concerned about this. Any ideas, anyone?

    Joe
    Tags: None
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    • Terry R.
      Expired
      • March 1, 2005
      • 359
      #2
      Re: 54 Vacuum fluctuation

      Hi Joe Sounds like a valve trying to stick to me. A little Marvel Mystery oil in the carbs will probably cure. I always put a little in the gas tank on the cars I don't drive regularly. Good Luck
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        • Roy B.
          Expired
          • February 1, 1975
          • 7044
          #3
          Re: 54 Vacuum fluctuation



          Top is a original design having the brass tag and you can remove the end nut to change spring tension.
          Bottom replacement no brass tag or end nut.
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            • Wayne P.
              Extremely Frequent Poster
              • August 31, 1975
              • 1025
              #4
              Re: 54 Vacuum fluctuation

              Are you "T" into the vacuum line. Hooking directly will cause the swings in the readings.
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                • Joe R.
                  Very Frequent User
                  • July 31, 1994
                  • 287
                  #5
                  Re: 54 Vacuum fluctuation

                  No, I hooked directly into the fitting for the trans vac modulator. Did not "T" into it. Why would this make a difference?
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