The PCV system developed a pinhole leak after 16 years I think where it attaches to the engine block, but not sure. The gasket for it it not available (dealer, hours on Google, nothing) nor was it feasible to tear the engine apart looking for the possible pinhole. If it's connected like it is at the factory, it squeals like a slipping belt. Removing the one way valve on the air box (leading to the PCV pipe) alleviated the squeal, but unknown to me it created a very lean running condition I didn't find for a little while. When this car was new, Ford had done a reprogram on the engine ECU and one thing was for it to be way less sensitive to lean running conditions (hence the lean CEL code never got thrown in super high lean conditions.) All is now fixed using a T and some vacuum line as seen in this video. My fuel trims have returned to perfect and my fuel mileage increased by approximately 35-40%.
If you ride has any vacuum leak, fix it ASAP otherwise the gas station will slowly and secretly eat your $ away. If any engine has to rely on the O2 sensors trim capability to run the correct air/fuel ratio then your pocket (and performance) will hurt.
Негізгі бет 1998 Ford Escort SOHC- New PCV routing (Alleviates crankcase squeal noise.)
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