oily air filter and a bad idle but smooth ride

[old_master]

Originally Posted by riptide44

yep a high flow pump would be the cause - these 4.3's pull alot of vaccum thru the pcv on its own - and thus people have constructed catch cans to keep some of that oil from going into the engine - i believe this is the real source of why these motors suffer from carbon problems - perhaps taller valve covers are in order for these engines . the highflow pump will just aggrivate the problem by putting more oil in front of the pvc valve .

The original post was concerning oil in the PCV filter, air filter, and air cleaner. The only way possible for that to happen is by insufficient PCV flow or excessive blow-by. High volume or standard, an oil pump has nothing to do with blow-by. Blow-by is the result of a piston rings inability to seal combustion gasses away from the crankcase, and crankcase oil away from the combustion chamber.

The purpose of the "catch can" is to collect oil vapor from blow-by, contain it, and allow it to condense. The liquid can then be emptied and disposed of. Why not allow the PCV system to do what it was designed to do? Repair the root cause; don’t put a “band-aid” on the symptom.

[Wags391]

Originally Posted by old_master

Why not allow the PCV system to do what it was designed to do? Repair the root cause; don’t put a “band-aid” on the symptom.

Because right now a "band-aid" suits my budget better than a correct full repair. I'm looking forward for the future to purchase a small block for my Blazer.