JMB RetrofitsChris Nott
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  1. #1
    Crazypete00's Avatar
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    Possible cure for the annoying S3 over revving when changing gear

    First a quick background.

    Had the car for over 2 years, around about 18months ago my car had a new clutch slave cylinder fitted and since then i noticed the annoying over revving when changing gear. not so bad back then but a year later it started getting really bad. change at about 4k rpm and it would shoot straight up to 6krpm.

    Car - Audi S3 2001 facelift
    Jabba custom map before i bought the car
    not alot else done to it.

    So i replaced the clutch switch (the one on it was broken anyway. - didnt cure the over revving
    Replaced a N75 valve from another S3 which didnt have the problem - didnt cure it
    removed and cleaned TB then re-aligned - didnt cure it
    replaced the DV with a forge one. - didnt cure it

    But yesterday, i was checking the car over, checked the brake fluid res, rear left under the bonnet as if you are standing in front of the car. Noticed a rubber pipe directly above it which runs alongside my charge pipe had split, well gone brittle and cracked where it connects to a 90 degree bend. At the time all the garages had closed and i needed a quick fix to get me where i was going. so i used duct tape, taped the crack and the connecter so nothing leaked, plus a cable tie to make sure. - well this seems to of cured the over revving while changing gears. drove for around 350miles the past 2 days and its been great, it still does it very slightly but heared that remapped S3s so it slightly anyway to keep the turbo spinning.

    so anyone who has this annoying issue check your rubber pipes around the brake fluid res and see if you have any split.

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  3. #2
    Y83OLK's Avatar
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    The servo pipe?.

  4. #3
    s3dave's Avatar
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    interesting thanks...

  5. #4
    S3 Owner

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    Got any pics of said pipe?

  6. #5
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    the only one it could be would be the servo hose, the other pipes would be hydraulic related

    definately get the hose changed.

    it says a lot about the places youve been taking your car to tbh

  7. #6
    Crazypete00's Avatar
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    not sure its the servo pipe, it runs down behind the engine towards the turbo then 90 degree bend and follows the charge pipe down the front of the engine.

    what do you mean about the places ive been taking my car? it has dont 150k miles so its probably the age.

    ye getting a replacement today

  8. #7
    Chugger

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    Yeah its the servo pipe, Mine original and in perfect condition. When you rev your engine does air blow out of the crack, because if it does that means the pcv check valves are letting by which could be the reason its split in the first place.

    I may be wrong but pretty sure servo is ment to get vacuum only, unless there is a check valve futhur up the line?
    Last edited by sportstractor; 9th June 2010 at 10:13. Reason: afterthough
    57 A3 2.0 TDI Sportback (140)

  9. #8
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    is the clutch switch correctly adjusted?

  10. #9
    Crazypete00's Avatar
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    ye the new switch doesnt need adjusting, the pin doesnt click in and out like the old one, its the new revised switch.

    the picture below with the red line is the one thats split




  11. #10
    Crazypete00's Avatar
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    you can see the green tape at the top were ive temporary fixed it.

  12. #11
    S3 Owner

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    What engine do you have as im 99% sure i dont have that hose?

  13. #12
    Crazypete00's Avatar
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    its the amk engine

  14. #13
    S3 Owner

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    Hmmm gonna have a look at this when i get home as i have an AMK and im pretty sure i dont have that?

  15. #14
    Crazypete00's Avatar
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    ok, maybe it should go under that top boost hose, but let me know as im 100% sure mines a amk.

  16. #15
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    iirc that hose is indeed part of the pcv system and as far am im aware should not cause over revving?!

    check out about half way down this page for a good picture and description:
    http://www.audi-sport.net/vb/showthr...ght=pcv+system

  17. #16
    Chugger

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    Quote Originally Posted by jonny87 View Post
    iirc that hose is indeed part of the pcv system and as far am im aware should not cause over revving?!

    check out about half way down this page for a good picture and description:
    http://www.audi-sport.net/vb/showthr...ght=pcv+system
    i checked this, and noticed there is a oneway valve futhur towards the servo, which means that pipe it under positive and negative pressure where it split. So it will make it over rev, hesitant and hunt on idle if this pipe is damaged
    57 A3 2.0 TDI Sportback (140)

  18. #17
    Crazypete00's Avatar
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    ye just checked it, took the tape off and it started over revving again, what sportstractor said makes sense so replaceing it has sorted my over revving problem.

 

 

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