How to know if plenum is leaking
#2
#5
There's several ways. Checking for pooling oil is one way. I thin sheen of oil is possible as the PCV vents back into the manifold, but pooling is oil coming in from the lifter valley.
A plenum leak will also manifest itself as a rather large vacuum leak. If you aren't pulling a good vacuum (20 inches or better) at idle, start checking for leaks. You can test to see if there's an internal vacuum being created by covering the PCV tube and the breather tube that goes into the stock airhat. NO vac is good.
I'm not sure that an oily spark plug is a definitive answer. It could cause that, but so could a worn piston ring.
A plenum leak will also manifest itself as a rather large vacuum leak. If you aren't pulling a good vacuum (20 inches or better) at idle, start checking for leaks. You can test to see if there's an internal vacuum being created by covering the PCV tube and the breather tube that goes into the stock airhat. NO vac is good.
I'm not sure that an oily spark plug is a definitive answer. It could cause that, but so could a worn piston ring.
#7
there is also a test where you disconnect your PCV valve temporarily,
then add official Chrysler ultraviolet dye to the engine oil,
drive the truck a few days,
then shine an ultraviolet light down the throttle bores
to see if the gasket has let oil leak in since the PCV valve was disconnected
then add official Chrysler ultraviolet dye to the engine oil,
drive the truck a few days,
then shine an ultraviolet light down the throttle bores
to see if the gasket has let oil leak in since the PCV valve was disconnected
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