[Westdubber]

Hi all,

I have just discovered this forum whle searching for info on the workings of VNT turbos!
I am living in West Ireland. I have been driving TDI Volkswagens and Audis for the last 8 years.

Currently I have a 2006 Audi A4 2.0 TDI 170bhp. Engine code is BRD. I have the car about 10 months now. Since purchasing it modifications have been a DPF delete and at the same time a remap.
This was done as the DPF blocked. I found it much nicer to drive with the DPF deleted. A lot more low down pull.

Unfortunately, recently, I have had more trouble with the car!! A flap in the EGR cooler broke and entered the cylinder head doing quite a bit of damage!!
I have fitted a second hand engine but the car is still not running nice.
When taking off, if you give the car throtle, it does not seem to boost - but if you lift off throtle and go again it boosts but on and off (quite violently)...

Currently I am suspecting a piece from my old damaged engine may have traveled through and into turbo and causing problems with vane movement....
Hence, the VNT Google search which has brought me here!
Any other suggestions are more than welcome!!!

Looking forward to being part of the community on here!!

 

[chittychittybangbang]

Welcome! This does sound possible, I assume the turbo was reused? Before removing it, I would also read the checklist for low power in the FAQ and see if one of those causes might be causing your problem. In addition to mechanical damage, a common problem is turbo control issues like sticking valve, solenoids, broken vacuum lines, etc. It could be as simple as a malfunctioning actuator. http://www.myturbodiesel.com/1000q/a4/VNT-wastegate-adjust.htm Here is an article on that, I'm not 100% sure but your car should be similar but with the smart sensor, the black part on the can.

 

[Westdubber]

Yes, the turbo was reused.
Thanks for the link - that is an excellent write up!
I will check the other possibilities before giving in to taking out the turbo again.
The advice is much appreciated! I will update the thread when I make some progress!!

 

[Seatman]

Hi, welcometomyturbodies. Hopefully nothing to difficult with the car.