I'm working on a 1989 240 DL. I've fixed a number of small issues before selling the vehicle. I replaced the Mass Air Meter to remove a Check Engine Light indication (code 121). While I had the hose going up to the throttle body loose I noticed there was significant oil residue in the hose. I took loose a smaller rubber hose going from the throttle body to the engine, and that appears to be the source of the oil. I assume it's purpose is to ventilate the crankcase? The little plastic gadget at the engine that the hose connects to (I assume it's a PCV type valve) presses into a hose or grommet that is connected to the engine.
The strange thing is the plastic unit has a screen in it, but no check valve like a normal PCV valve. Is that correct, or do I need to get a new unit?
Thank you.
Louis
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