Recently I have been seeing a lot of white smoke only under decel (vacum) after running the car hard. I am thinking that a catch can from the PCV will solve the problem, but is this a band aid fix for another problem? I also have the problem of high crankcase pressure and the dip stick blowing out. I solved that again with another band aid fis (hose clamp). I do have a catch can from the valve cover and it returns after the catch can to the intake. I have trapped more oil in there than I expected. The valvetrain is stock and I have not messed with the seals or valves at all. Could it possibly be a turbo seal? The engine and turbo (50 trim) only has a few thousand miles and otherwise seems to be running very strong. It recently put down 500whp@ 30 psi. Any ideas woud be apreciated

 

If you have to hose clamp your dip stick in then you have way too much blow by.

The only real fix would be to either lower the boost or replace your possibly worn rings.

What I would suggest doing is to get an evac system with a catch can.

If you are having this problem on decel chances are your rings need to be replaced.

 

Do a compression test. If you have low compression, pour a little oil directly into the cylinder an retest. If the pressure then bumps up you have worn pistion rings. If it doesn't most likley headgasket. Is the smoke pure white or white with a blue-ish tint. Blue-ish tint means oil, white is coolant. Many times when valve seals go bad they will leak on decel and not always on accel, but with the amount of blow-by I would lean towards rings. Also check you PCV make sure it isn't stuck open. GL

 

White = coolant/water
Blue = oil
Black = fuel

Do a compression test and check your oil and coolant for signs of mixture. Look for black specs floating in the coolant or milky oil.