04 4.8is blue smoke accellerating from a stop and sometimes at start-up??

[swissfrank]

Originally Posted by Estroil 4.8is

My 4.8 with 94k miles puffs a cloud of blue smoke when accelerating from a stop and sometimes at start-up or reving the engine. I think its burn some oil as well. I just replaced the 2 crankcase vent valves and didn't see any difference. What are other items should I inspect or replace. Thanks for any help this is embarassing with such a mean looking machine.

Did you inspect the old vent valves for damage? If they were damaged the intake would be full of oil and this could be one of the reasons you are still seeing the blue smoke. That's what happened to me, I still have some blue smoke for a couple of days and then it all cleared up. However my valve was clearly broken.

Another possibility is that you could have leaky valve stem seals.