Hi all, i could be classed as new but i am existing member but last car was a Polo...i now have a 54 passat 1.9tdi Highline and love it.

thing is its developed some strange querks lately, when driving at a steady pace(40 or 50 ish) i feel like a hesitancy in power and then the mpg on the trip comp drops a few and a black ploom of smoke outt he back, then it picks up ok.

got a hand scanner that does live readings and for the last week been watching it......also there are hidden error codes(P0236 for one).
i have replaced the MAF, MAP, de coked the EGR and manifild, checked intercooler pipes( well the bottom one doesnt seal propperly and you can feel it bulge when revved hard, seems a bit soft and a slight leak, orederd new seals) also i have some new pipes for the vacumes to the N75(which i am getting a new one today).

overall the car drives fine, good pickup when floor it, feel the turbo running, i did remove the pipe to turbo(big one from MAF) and feel the vanes on the turbo, looked ok, no slack and span ok.....

just this hickup thats doing my head in....dont have a VCDS but have erderd a cable and software, the hand held on work good.

any other areas i should for as i think i just about coverd it all....

oh its just gone 100,000 today as well, changed the oil(507.00),filter,fuel filter

PS, is that oil correct as i was told its the latest type for PD engines
and the MAP reading is an average of 114 and the MAF at idle is 6-7 then goes upto range of 50-80 when driving but does fluctuate

cheers all for reading and mybe throw a bit more light on this hickup...

kevin