Hi all, I'm hoping someone has a idea I haven't thought of. Have a 1990 Accord 129K miles, and never really seen it smoke, although I suspect it does a little because leval goes done and it doesn't leak. On impluse I stopped at a "quick lube" on the way home to change the oil, and soon after it now smokes quite a bit, and for quite awhileon start up until its fully warmed up. Sound like valve seals, but why all of a sudden? Anyone have an idea? I should mention that after driving it about 3 days, Idiscovered they had left the PCV valve unpluged. Ideas, things to check? Thanks

 

It could be valve stem seals, but could also be leaking oil from oil pressure switch onto hot exhaust pipe. Is smoke coming directly from exhaust outlet? If yes, then it's somehow getting sucked into the engine.

I've had worn oil seals on Mitsubishi V6 (Voyager), and it would also smoke big on takeoff after sitting. However, when engine was fully warmed, and brought to an idle for a minute or so, you would begin to see a smaller puff-puff-puff of oil smoke as long as you idled, and a much larger billow of smoke when you accelerated from this prolonged idle.

A blocked PCV can cause blowby to push oil vapor into the intake system. Excessive engine wear (low compression) will increase blowby, overwhelming the PCV vacuum, and cause crankcase oil vapor to be pulled into the intake. If you check the inlet air duct downstream of the crankcase air exit (usually) point, and find oil, you've found the problem; either non-fucntioning PCV or worn engine.

good luck