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Vacuum Reading


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#1 b6vt

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Posted 19 June 2011 - 10:35 PM

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 peecher

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Posted 19 June 2011 - 11:29 PM

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 b6vt

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Posted 21 June 2011 - 01:35 AM

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

#4 peecher

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Posted 21 June 2011 - 02:26 AM

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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