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B21 Vacuum problems? on 79 GT 200

posted by  Don Foster on  Tue Feb 18 01:50 CST 2003
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last visit: Sun Oct 5 11:53 CST 2014
[RELATED]

No doubt about it, vacuum problems suck.

Or don't, as the case may be.

What's this about a "filter over the PCV valve?"

Confirm that your crankcase ventilation system is free and clear and that you have a bit of negative crankcase pressure at idle. (I've measured the vacuum to be around 1.5 inches of water at idle.)

Also confirm that you have good, dry, clean ignition components. You might have a case of "crossfire," which occurs when sparks jump around in moisture 'n grime that sometimes collects on (or in) a dist cap.
--
Don Foster (near Cape Cod, MA)






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