Passat 2.0 TDI Misfire @ 3-4k rpm?

You're right Gareth, I will look into getting the codes read asap. Can't help myself with stuff like this - I want to know how to fix it myself, I guess that works on a MK2 but on a new VAG not so much haha.

 

EGR valve has been de-gunked however the problem is still there.

Garage reckon it is due to carbon/****e build up in the turbo and will need to be removed and cleaned.

Anyone any similar experiences?

 

have you not had codes read yet?

 

Misfire

Hi. I have the same issue Willber described on my 2006 Passat tdi 140. I had it checked out by my local independant VW/Audi specialist and they drew a blank. Initially they found a fault code that they said meant either one of the following (althought it wasn't specific enough to indicate exactly what was a t fault):

- Faulty injector on number 1 cylinder

- Fuel Pump

- wiring harness to the injectors

However after resetting the code they decided to road test it with the computer connected. This time the 'misfire' manifested as normal while 'giving it the beans' up the ring road, but no fault code!

The result was that they said they were stumped and would have to have the car in and go through checking things manually. It was just before Christmas and I needed the car so I decided to have the car back and see if the fault got worse thinking this might help to diagnose it easier.

I've had the problem for over a year now, and oddly in January the fault dissapeared for a day or 2. Like you Willber, I think its fair to say that it is there about 90% of the time.

A mate of mine who used to oown a commercial van sales garage suggested that the prolem could be the fuel filter. In his experience, they used to change injectors quite a lot (because that's what the fault codes indicated) but this often didn't fix the fault and they ended up just changing the filter which resolved the problem. I was a bit dis-heartened to hear that this didn't fix your mis-fire especially as the symptoms seem to be the same. However I have nothing in my (VW) service history to show that this has EVER been done! I guess I should do this anyway seeing as the car has now done 96K.

Once I've done this I'll let you know how I got on...

Tony

 

Belated post approval, apologies for the delay.

 

I had the turbo removed and sent for shot blasting/intensive cleaning out. The turbo guy said it was one of the worst ones he had seen and stripped it down and fitted new bearings in it.
I bought the car @ 50k and have now done 81k so it could have never been thrashed for 50k which would explain the carbon build up in the turbo.
They also took the head off it and found 2 very hard lumps of carbon in one of the cylinders. The head was removed as a precaution due to the fact that the turbo guy said that it looked as though a piece of metal/hard object had passed through the turbo.
They also cleaned out the EGR valve and all other related pipework and components.

The car was back on the road and I ran it back in for 300 miles to bed the turbo seals in (turbo guys reccomendation) The car drove a lot better with the recon turbo but the problem still persisted when driving the car at full throttle. I took it to a local VAG specialist who spend 40 mins with the car and tracked it down to the fuel filter. The car is now driving perfectly and recently had 4 wheel alignment done to cure the uneven tyre wear.

Hopefully shouldn't have any problems for a while!