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Vacuum testing procedure
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Posted by Vicsaero95 (more from Vicsaero95) on Thu, 13 Apr 2006 05:13:42 Share Post by Email
In Reply to: Re: Vacuum gauge readings.., saabnroark [Profile/Gallery] , Wed, 12 Apr 2006 21:51:29
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I watch my Autometer gauge all the time too. Here is what I'm reffering to based on factory bulletin:

Normal operation:
at idling speed, an engine at the sea level should show a steady vacuum between 14" & 22" HG. Quick opening and closing should cause vacuum to drop below 5" and rebound to 23" or more.

Ignition problem or sticking valves:
with engine idling, continued fluctuation of 1" to 2 " may indicate ignition problems. Fluctuation of 3" to 4" - sticking valves.

Intake leakage, valve timing or low compression:
Much lower vacuum reading than normal may indicate vacuum leakage or very late valve timing or worn piston rings.

Exhaust back pressure:
From idling, slowly increase engine speed to 3K. Vacuum should be equal to or higher than idle vacuum.

Cylinder head gasket leakage:
With engine idling, vacuum gauge will drop sharply every time the leak occurs. The drop will be from steady reading to 10-12". The drop will be much bigger if leak is between two cylinders.

Hope that helps. I keep this info in my car.

Victor

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