I have already mentioned about thes tests in vagcom, further up in my posts......
with the engine ignition on only , run throguh the test and I'm pretty sure you should hear the pump make noise as it sets it on and then should stop when ending the test. Maybe someone who does not have any issues can try and confirm this for us.
Mine does not make noise - so I think there is a problem.
The startling discovery I have made is that when the engine is running and I run through the tests and put the laptop away I find the problem has completely gone away. Again what that means......I'm not sure (electrical Haldex controller issue ?).
This discovery is a fact because as I do a sharp righ(or left) out of my garage I feel like the rear wheels are locking/ceasing. So I stop hook up the laptop, run through the test , disconnect and continue on my travels with no issue.
When I switch the engine off and on the problem comes back.
Maybe someone can figure out what the h*ll is going on here. Upshot - this problem is electrical and NOT mechanical, well certainly in my situation.
Oh and I should add there is no corrosion on the wires/plug into the controller and no errors shown up on vagcom (which is pretty much nearly everyones experience with these issues).
Further last note, running through the tests when engine is off and then starting car basically does nothing - the problem remains.
yeaah it was me that said that. My garage quoted £150 for the job .
do you mind me asking which garage? I'm in kingston so if its not too far from me, might give them a call. I've had quotes of over £300...!
Okay so the update! I plugged the car into vagcom, ran the haldex test and nothing came up as an issue however i did not hear any of the pumps or anything making any sounds during the test. I took the car for a drive and the issue had in fact gone away, but since turning the car off after that and driving it again the issue has come back.
I am getting a very loud clicking/knocking noise from the back of the car when on turning or even when i slow down for a speed bump or something, as i change gear and re-engage i can hear that sound also. I am wondering if anyone may know what this could be and if this is some what interconnected with this haldex issue.
Thanks for any help !
The oil in the haldex lubricates the clutch if not serviced the plates dry and grind and wear. the haldex spins the rear wheels at different speeds...one of the wheels rotates a shorter distance from the opposite hence why you can hear the noise at lower speeds or turning. It is far cheaper and easier to replace the rear haldex with a 2nd hand one.
I've been having this problem since I upgraded my Haldex to a blue controller...when I do a 3 point turn my back wheels feel as if they are locking up and they make a clunking noise....Plus my Haldex pump is constantly ticking....
I had a similar problem with an old a3 quattro and it turned out to be a plug in the pillenium chamber (sp) might be way off the mark but might be worth a try. Basically it had a intermittent connection when driving.
Fundamentally, rear (or front) wheel skipping should only occur if a diff is locked and preventing differential wheel speeds on the same axle ... Plate diffs have inherrent drag and of course welded diffs will always drag, torsen diffs will lock or transfer torque but only when one wheel tries to spin.
The rear diff on the haldex system (on the S3 8L) is open so the haldex clutches working or not should have no impact on whether one rear wheel is grabbing or not whilst cornering unless the open diff is faulty due to perhaps one of the planet gears breaking and locking it up - this could make grinding noises if the broken parts are rattling about but still in place. Some systems use electronic braking of individual wheels to alter the torque distribution on the axle, to compensate for the diff being open, but I think the S3 only has this on the front wheels and not the rear so this should not cause rear wheel locking either.
Martin
It means your fault is electrical. Checked the earth strap yet?
Is this my Earth Strap...FYI it looks like my problem is the earth strap:
Oh, and pulling fuse 31 did solve the dragging issue in my case...
Is this my Earth Strap...