black smoke no power help

[I_am_stealth]

I believe you had two problems, you fixed one of them..
The second problem you might have seems to be the variable geometry of the VNT turbo. That is a common problem..The vane control mecanism may need cleaning, and that is all.

[minty0_10]

i dont think its going to mater much now if there a hole or not there.
i was hit up the back side tonight by a landrover discovery. must say through what a well built solid car the a4 is. back hatch has had it. but rear quaters and boot floor are un marked!
still down to the insurance to sort it out for the time being.

[I_am_stealth]

Sorry to hear that....

[minty0_10]

mmm gutted was a nice car with all the toys to.
no sure if it will be repaired or not from what i can see its going to need
back hatch and glass
1 rear quater glass
bumper
and rear light.

[Huweth]

Gutted, do you think the turbo has been damaged in the crash also?

[minty0_10]

if only

[barney2]

hi Minty,
what a great pity your car's dead. I followed your symptoms with exitement, my car's a audi a6 1.9tdi avant. and has the exact symptoms. Smoke with little turbo power pulls in 1st and 2nd dies off in 3rd. No smoke and no power at all. I've changed everything apart from the turbo. Each time work is done on the fuel system it runs well for a while,then nothing.
please help.

[I_am_stealth]

Well, have you checked all the piping from the turbo-intercooler-inlet manifold?
If you are getting black smoke you should not be running excess of fuel/shortage of air... I strongly recommend you to check the thick tubing coming from the turbo-inlet manifold. Very likley that to be the reason.
Alternatively you could do with a log using VAG com, that way it will be obvious if your required pressure values are not achieved.
What do you mean by "it runs well for a while, then NOTHING?"

[barney2]

thanks for that stealth,
I would have to get that checked out at the garage, only i do think there is something wrong with the fuel system dragging in air..i did have a garage change out the fuel filter afterwards the turbo worked fine for a few minutes then nothing ...no turbo power no kick in the back feeling. I have read somewhere on here where a guy changed out the deisel lift pump cause it was dragging in air is this possible?
thanks.