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Thread: Vacuum Reading

  1. #1
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    Lees Summit, Mo (suburb of kcmo)
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    Vacuum Reading

    I have been having a problem with my 48 LC. No power. I took a reading to day with a Vacuum guage and at an idle it read between 14" and 15 " of Vacuum at an idle. This was a steady reading. What should it be? Glenn Lorei b6vt

  2. #2
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    Re: Vacuum Reading

    The normal is 17 to 22"/ hg at idle. You might check the compression to eliminate leaky rings and/or valves. Could have a vacuum leak...maybe the vacuum reservoir tank?

  3. #3
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    Re: Vacuum Reading

    Peecher, I took the reading right off the connecterat the intake manifold. Sounds like I may have further problems. Glenn Lorei b6vt

  4. #4
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    Re: Vacuum Reading

    Might even be a disconnected or partialy leaking vacuum hose under the dash. Those old hoses come loose real easy and the engine will run crappy.

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