1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

S3 8L Haldex Issues - Driving like a solid rear diff!

Jas Lad Oct 27, 2011

  1. larsmate

    larsmate Member

    121
    5
    18
    Thought you'd already swapped controllers. So you think the second controller was also a dud and now you're on your third?
     
  2. Jas Lad

    Jas Lad Member

    37
    0
    6
    My original diff was taken out inc its controller, swopped with 2nd hand diff and its controller, it was no better so i swopped it back to my original controller which made it worse, so with the change in behaviour im thinking its 2 duff controllers, I have a 110% working controller from an 01 4motion Golf to put in.
     
  3. larsmate

    larsmate Member

    121
    5
    18
    Best of luck!

    My car was two wheel drive for around six months until I replaced the pre-charge pump. This fixed the problem however now I get some slight locking of the inside rear wheel when driving very slow and on full steering lock. Probably not the same problem as yours but leads me to wonder two things - as someone mentioned earlier - the diff and the haldex are seperate but do they share the same oil? I have no controller problem but get similar symptoms to you except it only happens when the car is cold.
     
  4. Jas Lad

    Jas Lad Member

    37
    0
    6
    Answer me this, did you loose much haldex oil when removing the precharge pump or would I need another tube?
     
  5. thegoal007

    thegoal007 Another S3 owner....

    804
    26
    28
    not sure on the answer above, but bear in mind the majority of people who end up either replacing the diff or controller have never seen any errors show up on vagcom.....if only it was that straight-forward.
    Also bear in mind there are so many cars with this problem (well, i think so - a lot don't even want to mention it and rather just sell them on) it's best to get one off an Audi TT with frontal damage. Strangely I've not heard many TT owners complain about this rear locking issue.
     
  6. larsmate

    larsmate Member

    121
    5
    18
    Mechanic did the job but I did get charged for oil. I had no errors in vagcom saying the pump was dead but your pump is ok otherwise yourwheels wouldn't be locking up.
     
  7. Jas Lad

    Jas Lad Member

    37
    0
    6
    Ok another update.

    Got the controller off the mk4 4motion fitted tonite.... drives exactly the same as my last controller did. So i'm ruleing out the controller being the problem.

    All im left with now is to swop pumps from my old diff to this one and see if the behaviour changes. After that im out of ideas :(
     
    Last edited: Nov 17, 2011
  8. larsmate

    larsmate Member

    121
    5
    18
    So you've narrowed it down to being a mechanical fault (barring sensors). I don't believe there's any servicable parts in Haldex or diff so you'd better keep an eye out for a front ended TT.
     
  9. Jas Lad

    Jas Lad Member

    37
    0
    6
    Well im going to swap over my haldex pre charge pump to see if this fixes it or changes its behaviour, if it does i'll get the one off the 4motion.

    After that im calling it a day and selling it. I've spent hundreds.
     
  10. Jas Lad

    Jas Lad Member

    37
    0
    6
    Just a thought but would it be my steering angle sensor? Perhaps the car doesnt know what the steering angle is and thus doesnt know when to turn the pump off?

    Where is the sensor located at? VAGCOM shows the angle quite clearly correct so maybe not?
     
  11. Jas Lad

    Jas Lad Member

    37
    0
    6
    Has anyone a name or number of a haldex specialist I could get a chat with?
     
  12. Jas Lad

    Jas Lad Member

    37
    0
    6
    No one able to help? Looking like Audi is my last resort.
     
  13. beanoir

    beanoir Large Member

    2,171
    30
    48
    I use AmD in Thurrock and they know what they are talking about. Ben is helpful there. There may be an AmD closer to you.

    Plenty of others of course.
     
  14. Jas Lad

    Jas Lad Member

    37
    0
    6
    Thanks i'll give them a call, problem is im in Northern Ireland!
     
  15. thegoal007

    thegoal007 Another S3 owner....

    804
    26
    28
    I have to say, one fairly unique difference with your problem is that when you try the handbrake trick of lifting it up one notch then you never have a problem- 99% all rear locking wheel issues I have read stated that the handbrake trick did not work for them.

    Surely that must mean something to an expert and it's a fundamental point on where the problem is.
     
  16. superkarl

    superkarl MAN OF STEEL

    9,426
    2,392
    113
    To me that means electrical, not mechanical. Means the handbrake switch works and haldex controller works, otherwise itd do nothing.
    Steering angle sensor usually brings the esp light on.
    What happens when you have the car jaxked up and you spin 1 wheel?
     
  17. Broken Byzan

    Broken Byzan Photographic Moderator Staff Member Moderator VCDS Map User quattro Audi A4

    13,237
    465
    83
    Lifting the handbrake one notch tell the haldex unit not to activate the electronic controller. So i'd assume electrical too as the Haldex is engaged when it shouldn't be
     
  18. Jas Lad

    Jas Lad Member

    37
    0
    6
    Without no thanks from any Audi specialists or mechanics I fixed it myself, swapped the precharge pump and done an oil change... et voila, working 4wd :) PERFECT, so happy!
     
  19. beanoir

    beanoir Large Member

    2,171
    30
    48
    good news mate! Got there in the end.
     
  20. Jas Lad

    Jas Lad Member

    37
    0
    6
    I know im so glad its sorted, original diff must have had a seized clutch plate, 2nd diff had a faulty precharge pump... so now iv a spare working controller to sell which should recoup some costs I guess..
     
  21. superkarl

    superkarl MAN OF STEEL

    9,426
    2,392
    113
    in vagcom could you run a test on the pump tho? and hear it prime itself etc etc
     
  22. Jas Lad

    Jas Lad Member

    37
    0
    6
    Yep it all sounded normal enough but on the diagnostics you could see the pump on a low load basis wasnt dropping from a hi state into the low which it should have..
     
  23. thegoal007

    thegoal007 Another S3 owner....

    804
    26
    28
    which year, engine model is your car ?
    your fix is a first I've heard (pre charge pump failure) for this kind of issue.
    especially wierd when you couple the specific problems you were experiencing - so it doesn't quite make sense that was the issue.
     
  24. Jas Lad

    Jas Lad Member

    37
    0
    6
    Its a 2002 BAM... and the replacement diff apparently came out of one the same model.
     

Share This Page