Hey could a plugged EGR valve cause a motor to have a knock type sound and cause a real light tan to white runny substance on the oil cap??? I checked the dipstick but there is nothing but oil on that. I am still getting a 332 code from my car. I can keep it running noe and it developes that sound after the car warms up. I noticed when it does make the noise the cars starts running a bit rough as well. Please help as I am in garage now trying to fix it and have till the 14th to get it running or get fined by the city.
