Hi all, not posted much on here back when I had my A3 but now as a 2.5 tdi owner I can see there is lots of knowledge on here about 2.5 TDI's and I seem to have an issue that as far as I can see does not fall under previous threads I've read - some very very long!
I will outline the issue and then the things I have done so far - later today I will try to get a video of the noise.
So the issue is that once warmed up thre is a plinking or almost air sounding noise (sounds like chtuk chtuk chtuk) that increases with RPM.
When you first start the car (is starts first turn every time) it's much smoother until warmed up when you start to notice this noise.
I will now explain the second issue which may or may not be related, when the car is colder (so not yet at 90 on the temp gauge which it does get to much quicker then my old 1.9) if you need to give it some hard acceleration and change gears and step on it again it will chug and stumble until you depress the clutch let the revs drop and go again and it's fine.
Once warm this issue goes away - this issue again could be unrelated and this weekend I wan't to Mr Muscle the turbo in case it's coked up on the VNT rings.
The last factor - again maybe this is VNT ring or perhaps the noise itself, occasionally I put my foot down and the car feels amazing perhaps upwards of 20-30hp of what I usually see.
Now for things that have been done and not resolved things:
Injectors reseated with new washers
Fuel filter and union changed
Injector return lines replaced
VCDS code's all checked fine
CAM's are fine - when I changed the injector seals they looked great.
Car is on 189k miles atm - I understand the IP was rebuild by DieselBob at 100k not sure if any rebuilds after this point.
I have a few things I'd like to still check but one of which I think I need full VAGCOM for timing checks?
However at this point just seeing what thoughts and opinion's people have, things I could be checking I might be missing or overlooked.
I will outline the issue and then the things I have done so far - later today I will try to get a video of the noise.
So the issue is that once warmed up thre is a plinking or almost air sounding noise (sounds like chtuk chtuk chtuk) that increases with RPM.
When you first start the car (is starts first turn every time) it's much smoother until warmed up when you start to notice this noise.
I will now explain the second issue which may or may not be related, when the car is colder (so not yet at 90 on the temp gauge which it does get to much quicker then my old 1.9) if you need to give it some hard acceleration and change gears and step on it again it will chug and stumble until you depress the clutch let the revs drop and go again and it's fine.
Once warm this issue goes away - this issue again could be unrelated and this weekend I wan't to Mr Muscle the turbo in case it's coked up on the VNT rings.
The last factor - again maybe this is VNT ring or perhaps the noise itself, occasionally I put my foot down and the car feels amazing perhaps upwards of 20-30hp of what I usually see.
Now for things that have been done and not resolved things:
Injectors reseated with new washers
Fuel filter and union changed
Injector return lines replaced
VCDS code's all checked fine
CAM's are fine - when I changed the injector seals they looked great.
Car is on 189k miles atm - I understand the IP was rebuild by DieselBob at 100k not sure if any rebuilds after this point.
I have a few things I'd like to still check but one of which I think I need full VAGCOM for timing checks?
However at this point just seeing what thoughts and opinion's people have, things I could be checking I might be missing or overlooked.