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Originally Posted by Torqued
I've had a 1990 Escort for a couple of years and oil started appearing in the air cleaner. I checked for a PCV valve and this model doesn't have one. (According to Ford) The crankcase gas goes through a 2 stage orifice directly into the intake and any excess goes to the air cleaner. Compression is 130 on all 4 cylinders. If I remove the hose from the top of the valve cover the blowby seems excessive to me and contains lots of oil drops. Could a valve problem cause this? Any other ideas? The engine is a 1.9 CFI with 190,000 mi.
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Torqued,
From your description, it sounds like you believe it is a crankcase ventilation problem.....I agree that it's a possibility, although it is a high mileage engine.
On some of the CFI engines the crankcase ventilation filter is part of the filler cap. If the filter is clogged crankcase pressure can build up. I would change the oil filler cap.
With that much oil being returned to the intake manifold, I would expect an engine to smoke ....does it?
Alvin