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  1. #1
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    S4 exhaust question

    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
    2003 S4 Moro Blue Saloon

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  3. #2
    colinurquhart's Avatar
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    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.
    .
    2006 Audi A6 2.7 tdi Quattro S/line
    GONE BUT NEVER FOGOTTEN 2003 Audi S4 B6 Avant, LPG Converted, 19" BBS Speedlines, Stainless Creations Custom Exhaust.

  4. #3
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    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
    2003 pearlescent black s4 avant tiptronic - milltek exhaust - pre cats removed - remapped ...
    koni adjustable suspension front and rear
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    Paul @ Unit's Avatar
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    Maybe an Injector' Possibly EGR could be a few things maybe sooted up CAT theres a few possibilitys it could be

    2003 B6 Audi A4 Avant. 3.0 V6 Quattro Sport

  6. #5
    colinurquhart's Avatar
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    Quote Originally Posted by dualmono21 View Post
    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
    They all have the exhaust valve on the back box.
    .
    2006 Audi A6 2.7 tdi Quattro S/line
    GONE BUT NEVER FOGOTTEN 2003 Audi S4 B6 Avant, LPG Converted, 19" BBS Speedlines, Stainless Creations Custom Exhaust.

  7. #6
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    Quote Originally Posted by dualmono21 View Post
    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
    its a manual
    2003 S4 Moro Blue Saloon

  8. #7
    colinurquhart's Avatar
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    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.
    .
    2006 Audi A6 2.7 tdi Quattro S/line
    GONE BUT NEVER FOGOTTEN 2003 Audi S4 B6 Avant, LPG Converted, 19" BBS Speedlines, Stainless Creations Custom Exhaust.

  9. #8
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    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
    2003 pearlescent black s4 avant tiptronic - milltek exhaust - pre cats removed - remapped ...
    koni adjustable suspension front and rear
    alpine f1 dvi9990 -pxah990 headunit and processor - alpine d511r
    4 x focal 5ws midbass drivers - focal audiom 6w midrange - focal tce tweeters - velodyne df 12 sc servo controlled subwoofer
    3 x phoenix gold zpa 0.5 amplifiers

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    GeoffDunk's Avatar
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    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.

    Audi S4 quattro in Dolphin Grey Metallic, Silver leather, carbon inlays, RNS-E, 6 speed manual, electrically adjustable & heated seats, xenon headlights with power wash, cruise control, storage pack, 18" OEM RS4 wheels, RS4 ARB, LED lighting upgrade, FASH plus every bill since new.




  11. #10
    deano1978's Avatar
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    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 :-)
    A4 avant b6.1.9 avf 6 speed. Bv43 turbo.uprated fmic. More bhp custom map. Powerflow straight through twin pipes. Allard delete kit. Boost,egt, + voltage gauges. Ball,spring boost controller. Fk silversport coilovers. 312mm brake upgrade. B7 multifunc steering wheel. Full dis. Cruise control. Auto locks. Rs4 rear bumper. Full rs4 grills. Drls + hids. 10inch custom sub + amp. Rear parking sensors. Leds everywhere. Parrotkit full speaker streaming. silver 4d carbon interior.never ending...

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    GeoffDunk's Avatar
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    Quote Originally Posted by deano1978 View Post
    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 :-)
    The S4's V8 exhaust doesn't split or intersect for that matter, individual pipes front to back, no Y-splitter.

    Audi S4 quattro in Dolphin Grey Metallic, Silver leather, carbon inlays, RNS-E, 6 speed manual, electrically adjustable & heated seats, xenon headlights with power wash, cruise control, storage pack, 18" OEM RS4 wheels, RS4 ARB, LED lighting upgrade, FASH plus every bill since new.




  13. #12
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    Quote Originally Posted by GeoffDunk View Post
    The S4's V8 exhaust doesn't split or intersect for that matter, individual pipes front to back, no Y-splitter.
    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
    2003 S4 Moro Blue Saloon

  14. #13
    deano1978's Avatar
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    Quote Originally Posted by GeoffDunk View Post
    The S4's V8 exhaust doesn't split or intersect for that matter, individual pipes front to back, no Y-splitter.
    :O
    A4 avant b6.1.9 avf 6 speed. Bv43 turbo.uprated fmic. More bhp custom map. Powerflow straight through twin pipes. Allard delete kit. Boost,egt, + voltage gauges. Ball,spring boost controller. Fk silversport coilovers. 312mm brake upgrade. B7 multifunc steering wheel. Full dis. Cruise control. Auto locks. Rs4 rear bumper. Full rs4 grills. Drls + hids. 10inch custom sub + amp. Rear parking sensors. Leds everywhere. Parrotkit full speaker streaming. silver 4d carbon interior.never ending...

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    Paul @ Unit's Avatar
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    Same for the 3.0 V6 also

    2003 B6 Audi A4 Avant. 3.0 V6 Quattro Sport

 

 

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