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A4 Sline 1.9 170bhp hot exhaust smell and change in exhaust note

Discussion in 'Audi S4/A4/A4 Cab (B7 Chassis)' started by Applianceman2010, Dec 29, 2013.

  1. Applianceman2010
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    Applianceman2010 New Member

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    [Dec 29, 2013]
    As the thread title suggests i have a A4 Sline 1.9 170bhp with a hot exhaust smell and change in exhaust note . This has happened twice in the last few days after a long journey.(i regularly do long journeys and this has never happened before) The smell is like i've been gunning it and just driven through a large puddle ,the exhaust note is like the exhaust is blowing. I left it idling both times to get out and see what it could be,both times after about a minute it gives a bit of a judder and the car goes back to running normally.

    Any answers would be appreciated thanks in advance DJ
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  3. ChrisShepB7
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    ChrisShepB7 Member

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    [Dec 29, 2013]
    You sure it's a 1.9? As the 2.0 170 bhp have a DPF (diesel particulate filter) that when they start to get blocked the go into whats called re-generation where the ecu injects more fuel than normal to increase the exhaust temperature to burn off carbon inside the DPF.
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  4. Applianceman2010
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    Applianceman2010 New Member

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    [Dec 29, 2013]
    sorry yes 2.0....its been a long drive home. Ok that sounds plausible. i'm not getting any smoke when i put my foot down though. Do i need to be concerned or run some cleaner through it? etc.?
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  5. ChrisShepB7
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    ChrisShepB7 Member

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    [Dec 29, 2013]
    No you won't get any excess smoke. Don't be concerned it's totally normal, my lasses Lancer diesel shudders when it starts and finishes re-generation because of the ecu putting the extra fuel in then retuning to normal fuelling
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