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A3 20vt quattro smoky idle

Discussion in 'A3/S3 Forum (8L Chassis)' started by quattro rob, Sep 20, 2010.

  1. quattro rob
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    quattro rob Member

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    Hi guys i have a a3 running revo stage 2.5 and have recently fitted a decat pipe and since doing this it smokes quite bad on idle not blue smoke/oil just smells normal. any ideas wat can be causing this thanks
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  2. S3 Paul
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    S3 Paul Active Member

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    Did you have the post cat lambda sensor turned off?
    If you didnt that may be the problem. Failing that i would get the car logged and checked with vag com.
    A cat will hide a few things... worn engine parts being one of them.
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  3. Welly
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    Welly VX220 SC Driver :)

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    Are you sure it's smoke and not just condensation? Bear in mind you have no cat in there now - extra condensation is common.
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  4. badger5
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    badger5 RIP S3dave Site Sponsor

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    turbo... tired.. and or exhaust valve guides/stem seals
    change of backpressure on the seals without cat now can it seems draw oil out

    how oiley are your charge pipes?
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  5. quattro rob
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    quattro rob Member

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    Charge pipes have small amounts of oil, turbo was rebuild only 12k ago but it does have a hard life so maybe it time for second rebuild, or hybrid time :) if it still smokes be stem seals I guess, thanks for replys.
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