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Old 01-26-2004, 01:58 PM
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PCV system 1990 chevy 1500 Truck

I have a 1990 Chevy truck w/TBI 350. The TBI is getting really oily because the vent tube from the rear of the drivers side valve cover is pumping in a vaporized oil/air combo. I believe oil is being cooked off inside the engine (maybe due to the high mileage and worn rings) and causing this oily vapor to be sucked in thru the tube into the air cleaner and straight into the TBI. I am totally unfamiliar with the PCV system which I assume this is a part of. Anything I can do besides replace or rebuild the engine? Can the PCV system be diverted somehow?


Last edited by 69chevyfan; 01-26-2004 at 08:02 PM.
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Old 01-26-2004, 02:43 PM
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I think the system you are describing is the PCV system and it sounds like it needs to be serviced.
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Old 01-26-2004, 03:01 PM
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The EGR system has nothing to do with getting blow by into the air cleaner.

the EGR ( exhaust gas recirculation) system uses small amounts of burned gases and re-introduces them back into the intake flow to help control NOX emissions. The EGR system also helps control pinging under light acceleration.

If you are getting blow by into the air cleaner, ck the PCV valve and also check the hose that runs from that valve to the intake. Sometimes the hose gets soggy and collapses down and won't allow the crankcase gasses to past from the valve cover back into the engine.

If the engine has lots of miles and the PCV system is ok, you will probably need to start thinking about an overhaul. Usually, excessive blow by is caused by weak piston rings or scored cylinder walls, both will allow compressed air from the cylinders to enter the crankcase and then enter the air cleaner.

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