RE: PCV VALVE QUESTION
When I had a plugged PCV port on the TBI unit my oil pressure gage read very high and if my dipstick tube was not seated I would blow out oil through the tube. Also, the PCV valve would pop out of the valve cover. I would imagine a plugged PCV valve or hose could have the same symptoms. I did not figure out what was going on untill I bought a TBI rebuild kit and in the process of cleanig the TBI body i found that the PCV port was totally blocked. Once the TBI was cleaned and installed back on two the Vehical all was normal with the oil pressure gage, oil no longer blew out of the dipstick tube and the PCV valve stayed in the valve cover. Without a crankcase ventilation system the excess pressure will find a way out other then the PCV valve. Prior to the PCV in older cars they had just a breather cap installed on one of the valve covers.
1989 S15 Jimmy (DD) with 450K Miles, GM Factory Rebuilt Engine/Trans. New Paint, Headliner, New Suspension Bushings, Eddlebrock Waterpump/Shocks, Adj. Fuel Pressure Regulator and in line Fuel Gage, Injector Spacer, K&N Air Filter, Stock Exhaust, Michalin X-Radial Tires (215/70) Stock Rally Rims, Pioneer Head Unit, IPOD Adapter, Pioneer 4X6 Plates in the front, Pioneer 6X9 5 way sp Rear, 8" Clarion enclosed amp & supwoofer, 10 Disk CD Player. ABS Headliner, Original Owner.