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Exhaust smell inside car

Discussion in 'A4/S4 forum(B5 Chassis)' started by audi-a6, Jul 27, 2013.

  1. audi-a6
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    audi-a6 Member

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    [Jul 27, 2013]
    So, an a6 2.7t (posting here as similar engine to s4 and get more response) so as title says, just lately I've notice a strong smell of exhaust gasses inside car, but only when I put my foot down and on boost, if just pooling along at any speed at any rev it's fine, no smell at all, but as soon as on boost, it stinks inside car, I've checked under car, no exhaust blowing or any thing like that, any ideas?

    i might have lost a bot of power as well, as don't seem as torquey as it was but might just be I've got so used to the car
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  3. gen.heinz guderian
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    gen.heinz guderian Well-Known Member Regional Rep VCDS Map User

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    [Jul 27, 2013]
    Has the Pollen filter been changed?
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  4. Chillout
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    Chillout Active Member

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    [Jul 27, 2013]
    Try and restrict the exhaust with a rag and have someone look under the bonnet and chassis for leaks
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  5. shady-ninja
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    shady-ninja Active Member

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    [Jul 27, 2013]
    charcoal filter??
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  6. audi-a6
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    audi-a6 Member

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    [Jul 27, 2013]
    No the pollen filter has not been changed, but still the shouldn't be any gasses in the engine bay.

    does my car have a charcoal filter?

    with rags, worth ago I suppose
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  7. audi-a6
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    audi-a6 Member

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    [Jul 28, 2013]
    so, bunged up the tail pipes and no blows what so ever, so it must be between turbos and inlet manifold?
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  8. audi-a6
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    audi-a6 Member

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    [Jul 30, 2013]
    anyone got any ideas?
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  9. audi-a6
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    audi-a6 Member

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    [Jul 30, 2013]
    one thing i have noticed is that when the engine is cold, the smell is constant and only when the engine is warmed up is when it only smells under power load
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  10. Sulli79
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    Sulli79 Active Member

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    [Jul 30, 2013]
    Maybe a cracked manifold or turbine housing if your sure its not gaskets
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  11. audi-a6
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    audi-a6 Member

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    [Jul 30, 2013]
    would i not hear it though?
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  12. audi-a6
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    audi-a6 Member

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    [Jul 30, 2013]
    and it seems weird that when you first start car, you can smell the fumes on both sides at the back of the engine, (when your under the bonnet)
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  13. Sulli79
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    Sulli79 Active Member

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    [Jul 30, 2013]
    You may not hear it, both your turbos should be near the back on either side, you may be lucky and it's just gaskets
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  14. Todd1983
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    Todd1983 Member

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    [Jul 30, 2013]
    I had similar and was turbo-downpipe gaskets, but I could hear the leak
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  15. audi-a6
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    audi-a6 Member

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    [Jul 30, 2013]
    would that cause power loss?
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  16. Sulli79
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    Sulli79 Active Member

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    [Jul 30, 2013]
    Between manifold and turbo it will because less gasses to spin the turbine, and turbo to down pipe may see a minor drop due to loss of back pressure
    #15

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