Smoke on idle and on decel.

[g4ebguy90]

Well. I think my turbos dead .

Just some info.

Engine appeared rebuilt when purchased. 120 psi across all cyls. This was with throttle closed, every CYL was 120, engine wasn't even broke in when I got it.

Anyways, after having a month long boost leak and low boost. I replaced my throttle body and fixed everything. But now I think my turbo is dead.
Boosts just fine, but I got a little smoke at idle now all the time kind of a light grey/blue. But when I get to around 5 psi+ and let off, it blows off a big huge cloud of blue smoke... The higher the psi the bigger the cloud.

I assume my seals are shot due to a overspeed from my previous boost leak. Weird thing is, just last week I checked the turbo and it had no shaft play, but oil was in the intake.
What you guys think....
No it don't overheat, and oil can burn white.

 

[92AWDHX40]

Sounds like the turbo seals are shot pull her out and have it inspected.

 

[925awdtalon]

Yeah sounds like oil seal in turbo. Did you check the oil? maybe there is too much in there blowing past the rings.

 

[CrackedDSM]

Usually a blown turbo will do the smoke-screen under full boost. Smoking at idle, and under decel(not ACCEL) sounds like you have another issue like valve stem seals, or rings. 120psi is pretty low, I believe the service limit is somewhere around 135?

 

[JusMX141]

With compression numbers that low there's no doubt some excessive crankcase pressure which is hindering the turbo's ability to drain properly. It's one of those "chicken or the egg" situations- but if the turbo's old I'm sure it can benefit from a rebuild regardless.

Most guys buy up used 14B's and throw them on without ever giving thought to the fact that these turbos are now at least 16 years old. Turbo seals are nothing more than spring steel, and 16 years of constant heat cycling from daily driving will take it's toll on a turbo's ability to function as it should.

Do I think the turbo is the cause of your smoke? In all likelihood, yes- but I don't think it's the whole problem.