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This is not unusual. The Positive Crankcase Ventilation (PCV) system uses engine vacuum to create a negative pressure situation within the engine for emmissions purposes. All internal combustion engines have leakage past the piston rings, regardless of age. The PCV draws the unburned hydrocarbons that have leaked past the rings into the intake to be burned in the combusion chambers. This also has the added benefit of helping keep the engine oil cleaner by reducing the amount of contamination in the crankcase.

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โˆ™ 2015-07-16 18:25:38
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Q: If a new intake gasket was installed in a 98 Buick Lesabre 3800 v6 and if you pull the oil dipstick with the car running there is a suction into the crankcase that can be heard and felt by placing a finger over the hole is it a vaccum hose?
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