smoking exhaust

[key750]

This is my problem:
I have started the car (M12 2.5), whait two minutes, back out from garage and.... .... .... OMG!
SMOKY everywhere!!!
I have drove 200 meters thinking it's a small oil depositin in the turbo housing but smoke continous. Smoke a lot!
Shut down engine but a minute later restart for understand from what turbine oil exit. But....... ..... Nothing smoke! Zero! Nada! Niente!
All ended!!
Any idea?

[mgbond]

Wha colour is the smoke?

[Gadgeroonie]

you may have a faulty turbo

does it clear if you give it a rev

can you show us a video

[R0162]

oil restrictor to turbo?...

[key750]

Oil burned smoke, orribile oil burned stink.
Engine idle perfectly!

[R0162]

do you have stock exhaust?

[key750]

R0162 said:

oil restrictor to turbo?...

Both original fitted!

Not original exhaust! Why this question? Do you think an residue starvation?

[key750]

tomorrow i control the oil return tube to oil pan... if are blocked i have found a possibile cause

[Lakelord]

key750 said:

R0162 said:

oil restrictor to turbo?...

Both original fitted!

Not original exhaust! Why this question? Do you think an residue starvation?

Think the question about the exhaust is to help diagnose which turbo ( if it is a turbo ) is failing. Stock exhaust has one back box so both exhausts flow in and out of it and as such, you can't tell which turbo may be failing. Modified exhausts like the Rousch system have independent exhausts on either bank so you can see which side is smoking.

[jamie g]

Mine used to smoke really badly if I let it idle for a few minutes, once driving it was fine. It ended up needing a refurbed front turbo but I decided to get them both done to yellowshed spec along with other mods

[key750]

smoke are exit from rear turbo exhaust
Now I remove rear spark plugs to control situation in combustion camber.
After I remove return oil tube from turbine.
Thankyou Noble users!!

[key750]

It's official: I looking for a rear T25!

If someone havel one for sale I m here!!

[andygtt]

be clear... I think you are looking for a T25 from a 2.5L... the T25 on the 3.0L is larger.

[key750]

andygtt said:

be clear... I think you are looking for a T25 from a 2.5L... the T25 on the 3.0L is larger.

Yes, T25 rear to fit in a 2.5 GTO, thankyou!

[ludoZ3]

How did you go about troubleshooting the issue, I have something very similar on my car but didnt have too much time to look into it :s

[Blu3R]

ludoZ3 said:

How did you go about troubleshooting the issue, I have something very similar on my car but didnt have too much time to look into it :s

As Lakelord and jamie g mention, having a fully dual exhaust helps diagnose a duff turbo but ultimately if you start the car and allow it to idle, as the temperature rises one (on a dual system) or both exhaust tails will begin to puff blue smoke which can become a bellow if really bad. Basically the oil seals in at least one turbo have failed/are failing. The car will idle fine and you'd be hard pushed to notice any real performance loss. The other tell tale will be a trail of oil reside tracking up the boost hose from said turbo towards the intercooler, and if not noticed for some time - through the intercooler, along the other boost hose and into the throttle body and beyond.
A straight forward rebuild of the turbo will solve the problem but it would be very sensible to have the pair done together.

[R0162]

Lakelord said:

Think the question about the exhaust is to help diagnose which turbo ( if it is a turbo ) is failing.

[ludoZ3]

that's exactly what I have, start the car, no fumes for 30s-1min then lots of smoke for 2-5 mins then fine. I just had a turbo rebuilt as I spotted oil in the intake side to intercooler and even throttle body. They must have done something wrong :/

[R0162]

oil can drip, when the turbo and exhaust gets warmed up it burns it off then it when its burned the smoking stops...this i would say is normal, i heard something about changing the oil restrictors..

[ludoZ3]

it didnt smoke at all before turbo rebuilt though. I didnt change it myself so I dont know if oil restrictor have been replaced or not.