Does a faulty pcv valve (Positive Crankcase Ventilation valve) cause excessive exhaust smoke ?
most likely it will knock as well
might so easy and cheap to replace
Yes. This would definitely cause excess smoke, probably white in color. If the pcv valve is bad, it's probably leaking water into your oil, and oil into your cylinders, thus your engine is burning oil. This is an extremely cheap and easy fix. Make sure that when you change the pcv valve, you change the pvc valve grommet as well (the little black seal around the valve). Also, be extremely careful not to crack any plastic from the pcv valve or the grommet, because pieces of the plastic could fall into your intake manifold, and then you have to remove the intake manifold cover and that can become a pain in the a**.
