Blowing Smoke

[weeman1]

hey all, this is kind of a continuation from one of my old threads dip stick blowing out,

basicly my car has been blowing a white/ slightly blue smoke out the exhaust when i accelerate after being off the throttle. and sometimes when i first take off at a set of lights and im not sure why this is happening. to me it seems like the piston rings are stuffed and oil is building up in the combustion chamber while the car is idling or after coasting in gear then being burnt and pouring out the exhaust when i accelerate again, but then ive been reading on here that it might be the turbo oil seals, whats the best way to find out whats wrong?

my car is coming up to almost 200,000 k's so thats why im leaning towards the pison rings being stuffed, ill get a compression test sometime this week to confirm this otherwise if you guys have any ideas please throw them up, btw car is an R33 gtst pretty much stock, turbo is stock aslo, i have a bleed valve to control the boost also and theres a heap of oil comng out of that too

cheers

[payback21]

If its not rings or turbo, i would say it would be more like valve guides or valve stem seals in the head. I would suspect the head to fail more than the block and rings. It depends on what sort of a maintenace life the vehicle has had thru out its years.

[turael]

so your intake is full of oil?

if you want to take the turbo out of the equation, literally bypass it, connect your afm up to your throttle body and idle it for a bit, see if it blows smoke? just disconnect your normal IC piping.

edit

of course you'd have to actually remove the turbo too, sigh, proving difficult

i know someone that did it while testing for blown seals, but it would probably be a bit loud/effort for most people

Edited October 20, 2009 by turael

[Jez13]

If its not rings or turbo, i would say it would be more like valve guides or valve stem seals in the head. I would suspect the head to fail more than the block and rings. It depends on what sort of a maintenace life the vehicle has had thru out its years.

+1 definately a posibility with the deacceleration thing.

[Dorifta]

do a dry compression test and then do a wet test, this will isolate if ur top or bottom end is worn, could even be blocked pcv and breather hoses,