why from Black smoke goin to blue smoke under boost

[fast90eclipse]

ok heres the problem under boost if u look back you'll see blue smoke under boost. but only under hard accelleration. then when u decel to a stop u'll see alil blue and then if u sit at a light for a minute or two it'll still smoke a lil blue for a while. but my question is what is causing it to do this. how can i fix this problem????

 

[4G63_Attack]

black smoke if from your fuel.

blue smoke: your burning oil. it can be from the followings: Turbo, piston rings etc.

you can take off the intake pipe and check turbo for play like in, out, side to side and up and down. for you compression you can do a wet test.

 

[marsh63]

how often do you have to put oil in the car?

sounds to me like valve seals but im not sure. also check to see if you have alot of oil in your piping to your intake.

 

[TunaTalon]

black smoke if from your fuel.

blue smoke: your burning oil. it can be from the followings: Turbo, piston rings etc.

you can take off the intake pipe and check turbo for play like in, out, side to side and up and down. for you compression you can do a wet test.

4G63_Attack has it right.

Black smoke is from running rich but the blue under boost is from burning oil.
My 91 Talon had a leaking seal on the turbo at about 80K miles. In addition to the blue smoke I had oil fouled plugs with a noticeable loss of power.

 

[fast90eclipse]

the valve seals r new. the heads been rebuilt by a good machine shop with less than 5k on the head the same for the turbo too. ### the head and the turbo was put on at the same time. ya havent replaced the plugs in a while. i put oil in it maybe every 1 or 2 weeks if its low which is not that often. plus my main oil feed line to the turbo leaks alil but right at the turbo. compression is great i dont remember what the number were but they are good across the board.

 

[fast90eclipse]

plus alil power lose too.

 

[TalonTSIawd1991]

We know that black smoke is running rich and blue smoke is oil. You could have turbo seals leaking. You dont have to be under boost to have blue smoke.

 

[fast90eclipse]

ya i fix the problem by putting my stock turbo on that i bought off craigslist for 50 bucks. no more smoke. so ya the evo 16g had alot of shaft play to were the seals would leak.

 

[turbolover10]

That sucks, glad to see you found the problem though.

 

[Talesin]

Yeah, just get it rebuilt (or get your cash back if you can). So long as there's no wheel damage to the compressor, turbine, or housings.. should be salvageable.
Didn't you check the turbo for shaft play before you put it on?