Audi A4 2001 2.5tdi v6 misfire? juddering.
Hi I have an Audi A4 2001 2.5tdi v6 2001 tiptronic ( b6 ) I've had this problem for a while where as when on the motorway i could be giving the car some beans everything seems fine but when i relax the accelerator and then try to cruise ( just maintaining speed ) the car starts what feels like a misfiring session and judders quite bad. Had a snap on scanner on it and the only code is that was present was the transmission fault code P1857/18265 error message from ecu intermittent. I've had new fuel filter, New bosch maf sensor, coolant temp sensor and i have put a blanking plate on the egr valve. The turbo actuator arm looks nice and smooth. This fault code has not come back but the initial problem still remains...Is there anybody out there who can point me in the right direction. The car performs fantastic in every other sense other than this....cheers