The other day I saw a bunch of black dried crud around the PCV valve and spread onto the rear valve cover. Methinks it's the PCV valve that maybe clogged. I'm going to replace the PCV valve, but some guy on another forum told me he did this to remove any minor sludge buildup in the process.
- (with engine on)remove the hose from the pcv valve and suck up 1/3 can of seafoam, to help clean the pcv vacuum system of any buildup.
- pour 1/3 can of seafoam into crankcase.
- pour 1/3 can of seafoam into gas tank.
- drive the car on highway or backroad until smoke stops.
- perform oil change.