400 quid all in, that's being replaced with a Sachs clutch too. It's not an uprated clutch, just a replacement OEM but my Audi indi who is doing the work chose the clutch with the knowledge it's being remapped in a few months and said it'll be able to cope no problems. I've read people on here paying 6-700....crazy!
4WD System not working
- Thread starter Lemon S3
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400 quid all in, that's being replaced with a Sachs clutch too. It's not an uprated clutch, just a replacement OEM but my Audi indi who is doing the work chose the clutch with the knowledge it's being remapped in a few months and said it'll be able to cope no problems. I've read people on here paying 6-700....crazy!
s3-Ryu
Quantum Quattro
This is also wrong, four wheels being driven is 4wd whatever label you stick on it. There is always drive to the rear to some extent (unless braking or h/braking) which becomes more so as the front loses traction, my car will donut on its nose in the snow or wet which indicates to me power being delivered to the rear. Every fwd audi i drive is all over the shop then i drive home in my S3 all is right with the world
I like how you defend the quattro system, to be honest I agree it is a very nice 4wd to have and it has been proven it performs better than most 4wd car etc out there, I am sure some of you have seen this but have a look at it.
http://www.youtube.com/watch?v=Dx2mgPw33r4
http://www.youtube.com/watch?v=Dx2mgPw33r4
my 4wheel drive is not working too. The first thing to check is the fuse? Then what? I only changed my oil, haldex filter a few days and now it does not work. Really annoyed, i dont know if this is normal but under hard acceleration the front of the car violently judders like the front wheels are wheel spinning? I have never had this before, has any1else? Im scared to boot it now as it feels unstable. Any help appreciate
Mpathe
1st gear
yep its the front wheels when it judders like that. did you disconnect any wire or the earth strap when you changed the oil and filter on the haldex
No i didnt disconnect any earth strap or wire when i did the haldex filter and oil, is it worth checking to see if i did? the violent judder seams painful lol
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For all you guys having trouble with your haldex I would do the following:
- Get car scanned for any faults as this may give you some idea of the problem before you start.
- Put car on grass or snow and get someone to check the rear wheels are spinning or not
- Check Fuse
- Check handbrake switch. is there a red handbrake light on the dash?
- Change haldex oil and filter. Costs about £30
- Check earthing strap on the haldex unit. If it is damaged/heavily corroded replace it. costs £5
- Check haldex pump with VCDS/vagcom
Unfortunately there is a lot of electrical components that contribute to the haldex unit working correectly so you will be better off if you can get the thing on vagcom.
- Get car scanned for any faults as this may give you some idea of the problem before you start.
- Put car on grass or snow and get someone to check the rear wheels are spinning or not
- Check Fuse
- Check handbrake switch. is there a red handbrake light on the dash?
- Change haldex oil and filter. Costs about £30
- Check earthing strap on the haldex unit. If it is damaged/heavily corroded replace it. costs £5
- Check haldex pump with VCDS/vagcom
Unfortunately there is a lot of electrical components that contribute to the haldex unit working correectly so you will be better off if you can get the thing on vagcom.
Top man.
the handdbrake light is off, i have changed the oil and filter on the haldex, the fuse for the haldex is intact, i need to check the earth strap- can you describe where this is please? or a photo?
cheers
the handdbrake light is off, i have changed the oil and filter on the haldex, the fuse for the haldex is intact, i need to check the earth strap- can you describe where this is please? or a photo?
cheers
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I dont have a photo but the strap is on the rear diff. If you get under the car and have a look round the diff and haldex unit you should be able to make it out. Someone on this forum had a corroaded strap that caused his haldex to stop working a few months ago. New strap for £5 sorted out the problem.
thanks Westle, i will try and get the car up on the ramps tonight at work. Just really puzzles me that it has done this after i have put fresh oil and filter in the haldex?! I dont think the haldex was working before hand now, thought it would great in snow and on ice
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i havent got anyone to look at them, but i opened my door fully and leaned out while the fronts were spinning and rears just rolled along and did not spin
I thought they were FWD until the fronts lose traction then the haldex clutch kicks in and engages the rear wheels. There is no drive the rears until this happens.
This is why you can see a delay between fronts losing traction and rears kicking in. I have a video taken the other day which shows this (got a friend to film me in the snow), but i can't post it because my plate is visible!
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The haldex doesn't just apply power to the rears when it feels the front slip. It applies power to the rears in deifferent situations. for Example, if you are accellerating hard from a slow rolling start it will apply some power to the rears.
look at page 34 of this:
http://www.vaglinks.com/Docs/VW/Misc/VW_Haldex_AWD_SelfStudyGuide.pdf
look at page 34 of this:
http://www.vaglinks.com/Docs/VW/Misc/VW_Haldex_AWD_SelfStudyGuide.pdf
Just got off the phone to the mechanic, still no joy. He's replaced all kinds of sensors. Wheel speed, ABS, throttle position, handbrake etc still no joy. Nothing showing up on VAGCOM either 
i have heard the pre charge pump for the haldex can cause problems what were experiencing which wont show up on vag.com
I'll see if he's checked that when I speak to him later. He said he's waiting for a call back from a technician he knows who works for Haldex in Stockholme for some advice
keep us updated mate so we can point each other in the right direction with this problem. Cheers
I will do bud. When I was talking to the guy he said there's so many pathetic little things that can cause major issues with the Haldex system
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I will do bud. When I was talking to the guy he said there's so many pathetic little things that can cause major issues with the Haldex system
Get your mechanic to take a look at the PDF I posted above. It shows all the components that make the Haldex work. Page 20 shows you all the sensors that send signals to the unit. It also shows you how all the hydraulic stuff works too.
Yeah he's an audi specialist...he races, strips and rebuilds his TT so should be able to sort it soon. Fingers crossed anyway!
any updates with peoples cars? My S3 has still no four wheel drive when driven hard. Showing no warnings lights, check the haldex filter last night and it was loose so nipped that up, lost a little oil. Would this make any difference? I noticed 2 plugs on the side of the haldex but they are held in by spring washers, are these the check plugs?
cheers
cheers
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Did your haldex show and signs that it had been leaking before you nipped up the filter? You may need to put some new oil in, any idear when your last oil and filter change was?
my oil and filter must not have been changed since it was new since 2002. Even though i paid someone to supposidly do them both!
I changed the oil and filter last sat and the oil was black, had it up on some ramps, injected the oil in and hardly lost any. When i had it up on the ramps last night, there were signs that the haldex had been leaking through the filter because it wasnt tight enough. My question is, if it has lost that much oil, can it stop the haldex from working?
I changed the oil and filter last sat and the oil was black, had it up on some ramps, injected the oil in and hardly lost any. When i had it up on the ramps last night, there were signs that the haldex had been leaking through the filter because it wasnt tight enough. My question is, if it has lost that much oil, can it stop the haldex from working?
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If the haldex is dry faults can happen. I'm guessing you changed the oil and filter last week because your haldex stopped working? Did you check the rear diff earthing strap while you were under there?
i chnaged the oil and filter because im carrying out a full service on it, spark plugs, coil packs, fuel, oil, air filters and fresh oil.
The car was fine til a few hours after i had been driving it, whether because it has lost oil due to the filter working its way loose i dont know. Could this be a reason why the haldex has stopped working all together?
I didnt manage to check the earth strap, totally forgot but i will do. My guess is too cut my losses, drain the new oil from the haldex and buy some new oil and inject it in tommorow
The car was fine til a few hours after i had been driving it, whether because it has lost oil due to the filter working its way loose i dont know. Could this be a reason why the haldex has stopped working all together?
I didnt manage to check the earth strap, totally forgot but i will do. My guess is too cut my losses, drain the new oil from the haldex and buy some new oil and inject it in tommorow
Update folks. I've got the car back but still no Quattro. The mechanic is stuck He believes it to be an electrical fault, he said the pump is not getting any current from the wire that powers it. He doesn't think it's the pump itself. Anyone know where I can get hold of a wiring loom diagram for the S3?
He believes it to be an electrical fault, he said the pump is not getting any current from the wire that powers it. He doesn't think it's the pump itself. Anyone know where I can get hold of a wiring loom diagram for the S3?
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you could get a copy of elsawin off fleabay. you wouldn't even need the latest one so could be had for much cheapness. in that you will get the wiring diagrams and also the mechanical manual too. well worth it imho.
Errr. No it doesn't. It still uses the Haldex system, although a newer system than the 8L S3.
Cheers,
Alistair
can you get faults where the rears only kick in partly, when i've been getting stuck and trying to get up icy hills in mine recently, the rears only sometimes kick in and only for brief short periods of time.
i would have thought that as soon as the fronts start spinning the rears would kick in and stay on until the fronts start to grip again
i would have thought that as soon as the fronts start spinning the rears would kick in and stay on until the fronts start to grip again
The 8l system alway has drive to the rear just at times not noticeable. This is why all four wheels spin up on the ramp and when the system is broke they dont. Westle is also correct in his discription of the different times more or less power is supplied and when being nailed the drive to the rear is at its maximum, the 8p is just more advanced and works more on throttle position.
i managed to sort my problem out, the haldex oil was low so i drained it all and put a new tube of oil into it. All problems sorted! I didnt think the haldex low on oil would stop it completely working and its so much better to drive. Thanks for the advice guys
Can anyone tell me where the earth strap is, how to drain the haldex oil and top up and where the haldex filter is. Thanks in advance.
Not to worry about the filter and drain plug as I found this:
But still need to know where the earth strap is.
But still need to know where the earth strap is.
Also found this, not very clear and it's a golf but it's something.
http://www.youtube.com/watch?v=TCekYp8YuKk&NR=1
http://www.youtube.com/watch?v=TCekYp8YuKk&NR=1
