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S4 exhaust question

Discussion in 'A4/A4 cabriolet/S4 forum(B6 chassis)' started by s4mark, Jun 14, 2013.

  1. s4mark
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    s4mark Member

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    [Jun 14, 2013]
    Hi all, well had the s4 for a few months now and still so pleased however I have noticed that the left exhaust pipe gets very black and sooty quickly where as the right hand one seems to stay pretty clean. Anyone have any idea why this might be happening? Does one do more work than the other or may it indicate that a sensor has gone bad causing it? I plan to get it down to the specialist I use when i get a chance and no doubt they will stick it on vag com but just thought I would see if any one else has had this issue.

    Other than a slightly noisy fuel pump, I cant really fault it, car seems to run fine and check oil level religiously every week. Any ideas appreciated.

    Thanks
    #1
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  3. colinurquhart
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    colinurquhart Member

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    [Jun 14, 2013]
    The two exhausts are completely independent but my left one soots up quicker than the right also but it's never really bothered me too much. It will be interesting to hear what your specialist says so I'll keep an eye on this thread.
    #2
  4. dualmono21
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    dualmono21 Well-Known Member

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    [Jun 15, 2013]
    tiptronic or manual ?
    the tiptronic exhaust has valves in it which open at a certain rpm if one of the valves is stuck then this could be the problem
    #3
  5. Paul @ Unit
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    Paul @ Unit Active Member

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    [Jun 15, 2013]
    Maybe an Injector' Possibly EGR could be a few things maybe sooted up CAT theres a few possibilitys it could be
    #4
  6. colinurquhart
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    colinurquhart Member

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    [Jun 15, 2013]
    They all have the exhaust valve on the back box.
    #5
  7. s4mark
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    s4mark Member

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    [Jun 15, 2013]
    its a manual
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  8. colinurquhart
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    colinurquhart Member

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    [Jun 15, 2013]
    Also I doubt the valves would be the issue as I've just changed my exhaust and now have no valves and still my right pipe soots up quicker.
    #7
  9. dualmono21
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    dualmono21 Well-Known Member

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    [Jun 15, 2013]
    not seen a manual mate
    so didnt want to assume they were the same or indeed differant
    ive also changed my exhaust but both exhausts seem to soot up around the same
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  10. GeoffDunk
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    GeoffDunk Active Member

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    [Jun 15, 2013]
    I recently had my valves serviced and checked for operation as one side sounded louder at idle than the other and sure enough there was one stuck open, both now operating correctly and still the left hand tail pipe soots up a lot more than the right.

    Mine is also a manual and I had never really thought anything of it but would be intrigued to find out why this happens, seems common though.
    #9
  11. deano1978
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    deano1978 different gear

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    [Jun 15, 2013]
    Same with mine too. I put down to the way the pipes divide. If you have a Y shape splitter then it should split evenly. But mine is a straight through then branches off to the right.

    If you think of it like a long straight water slide,but then add a slide on the side,majority of water will still flow down the main slide,but some will flow down the side too. Just not as much.

    Thats my theory anyway :)
    #10
  12. GeoffDunk
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    GeoffDunk Active Member

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    [Jun 15, 2013]
    The S4's V8 exhaust doesn't split or intersect for that matter, individual pipes front to back, no Y-splitter.
    #11
  13. s4mark
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    s4mark Member

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    [Jun 15, 2013]
    at least it seems a common issue so that makes me happier. Once its been down for its health check i will post to let you all know what they say
    #12
  14. deano1978
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    deano1978 different gear

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    [Jun 15, 2013]
    :O
    #13
  15. Paul @ Unit
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    Paul @ Unit Active Member

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    [Jun 15, 2013]
    Same for the 3.0 V6 also
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