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Way more smoke then there should be for a diesel!

Dougie'76 Apr 20, 2014

  1. Dougie'76

    Dougie'76 Member

    Evening all,

    So I've got an A4 TDI 170 and recently its been kicking out pretty substantial amounts of smoke with unburnt diesel mixed in for good measure. There doesn't seem to be any real pattern for when it happens but when it does, it can get really crazy and leave serious smoke clouds at the back of the car!

    I've just spent ages reading various threads on here using the search bar, in the usual fashion, but I'm still unclear as to what to check first and what it could be.

    VAGCOM hasn't thrown up any fault codes and apart from the smoke, the only other thing I've spotted when looking over the car is oil in the diesel filter. That said, there's not huge amounts and I'm not losing so much that I'm having to top the oil up. No issues with low coolant levels or anything else like that either.......so I'm stumped!

    From reading through the search results the tandem pump seems to be getting mentioned quite a bit but as it's not the cheapest of parts to replace on the off chance it works, I thought I'd test the water to see what else you guys thought it could be? Or if there are any tests I can do to try and figure out what the hells going on?

    As usual, thanks in advance for any help you can give!
  2. lynallbel

    lynallbel Active Member

    Have you checked simple things first, like air filter, air filter mesh?
    Egr valve?
  3. ajax1976

    ajax1976 Well-Known Member

    Coolant temp sensor could be worth a try, just disconnect it first to see if it makes any difference.
  4. stevegrass777

    stevegrass777 Member

    Replace the gasket on the tandem pump first and see if it fixes the oil in fuel problem.

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