2000 BMW 528i Q&A
2000 BMW 528i Question: pcv valve replacement.
mechanic told me that i need to replace the pcv valve.... i dont know how he came to this, but auto is running rough. auto has 215m miles ... sometimes feel a miss, and sometimes a lunge(at stop light)... otherwise still going ok... must keep driving, but mech insist that performance would improve with this pcv thing.... approx est cost 550.00...... i cannot find pcv replacement on your website. thanks donwalters - Visitor
Bad PCV could cause these symptoms, since unmeasured air enters into the intake. PCV (Crankcase Vent Valve) could be tested by a manometer. It's from the BMW repair manual: A properly functioning pressure control valve is designed to maintain a slight vacuum (approximately 10 - 15 mbar ) in the crankcase which assures reliable crankcase venting during all engine operating conditions. A malfunctioning crankcase ventilation valve may cause the following complaints: * Engine runs rough * Whistling noise from crankcase ventilation valve * Check engine light on - possible DME faults stored: misfire all cylinders, oxygen sensor/mixture faults, etc. You can do this: While the motor is running at normal operating temperatures, loosen up the oil filler cap and try to lift it up. If there is a strong vacuum sucking the cap back, the PCV valve is bad. I don't know if their estimate includes all the vent hoses, I'd strongly suggest to replace those also. Zee - ZeeTech