New to forum, have couple questions
Veteran
Joined: Mar 2005
Posts: 354
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From: AZ and Utah
you can test the plenum gasket easily, this is right from Mopar.
Disconnect the PCV from the valve cover gasket and let it dangle.
Do the same with the crankcase breather.
With the engine idling, place your hands over the exposed holes in the valve covers, and wait about 10 seconds, then lift one hand slowly, see which way the air flows....
The crankcase is normally under a small pressure, so air should flow OUT, if it goes in, the plenum gasket is leaking and sucking air from the crankcase.
If you have in your toolbox the old standby vacuum gage that will read low pressures, that can be held in the PCV hole to determine if you have pressure or vacuum....
Replacing that gasket is an all day job...
Disconnect the PCV from the valve cover gasket and let it dangle.
Do the same with the crankcase breather.
With the engine idling, place your hands over the exposed holes in the valve covers, and wait about 10 seconds, then lift one hand slowly, see which way the air flows....
The crankcase is normally under a small pressure, so air should flow OUT, if it goes in, the plenum gasket is leaking and sucking air from the crankcase.
If you have in your toolbox the old standby vacuum gage that will read low pressures, that can be held in the PCV hole to determine if you have pressure or vacuum....
Replacing that gasket is an all day job...