PCV 2 - PCV System Function

^ Run the engine at idle until warmed up.

^ Remove the fresh air inlet hose at the air inlet end, and plug the nipple immediately to prevent stalling.

^ Verify by feel that vacuum is present at the inlet end of the hose.

^ Is vacuum present?

NOTE: If air pressure, oil, or oily sludge is present at the intake end of the fresh air supply hose, the engine has excessive blow-by caused by cylinder bore, piston ring or valve stem wear, or by a defective or incorrect PCV valve.

YES -- PCV system is OK.

NO -- Check fresh air and PCV hoses for leaks, loose connections, blockage, or loose oil dipstick. Correct as required until vacuum can be felt.