Very Smoky Diesel A6

[D_T_W]

Just wondering if anybody has any advice as to why? And before anybody starts, i know diesels are smoky anyway, but i was sitting at a set of traffic lights earlier and i could see it wafting past the window, and when i pulled away with even light acceleration and you could hardly see the car behind. Its done it a couple of times before, but not all the time.
Was thinking it might be a sticky injector, or something more serious, could a diesel additive clean it up and possibly solve the problem? Its a 98 A6 2.5 tdi with 110k on the clock, so i know it could be something more serious, just hoping its not

[00161wj]

Could be anything mate. Cant really diagnose it online tbh. Probably be the turbo though with that mileage. suppose the easiest thing for you to check to start with is that the air filter isnt goosed. Otherwise if you dont know much about cars take it to your stealers.

[motorwise]

without seeing it it's hard but if it's black smoke I'd be inclined to blame the MAF sensor (very common failure point on these) - as a crude cure unplug it and see if the situation improves, if it does you've almoast certainly found the culprit

good luck

[Dilligaf10]

There is an article in this months Audi Driver mag about the early 2.5TDi engines and problems with the camshafts, might be worth a look.

[00161wj]

motorwise said:

without seeing it it's hard but if it's black smoke I'd be inclined to blame the MAF sensor (very common failure point on these) - as a crude cure unplug it and see if the situation improves, if it does you've almoast certainly found the culprit

good luck

Never heard of airmass meters causing black smoke but could be wrong

[motorwise]

00161wj said:

motorwise said:

without seeing it it's hard but if it's black smoke I'd be inclined to blame the MAF sensor (very common failure point on these) - as a crude cure unplug it and see if the situation improves, if it does you've almoast certainly found the culprit

good luck

Never heard of airmass meters causing black smoke but could be wrong

you are

[old64er]

Black smoke is a common symptom of the MAF, mine was changed at 112k.

The early ones did suffer from camshaft wear, mine were replaced at 75k.