Ideas / Advice Please - Cayenne S Auto 3rd Gear 'Judder'
Discussion
I have a 2004 Cayenne S which Ive been running for a few months now.
I had the coil packs and plugs replaced a while ago which sorted a misfire issue, but now I have a sort of 'juddering' normally experienced at low revs, with little throttle and normally in 3rd gear.
Im wondering if its something to do with the oversize alloys that came on the car (22" tech style), and its messing with the gearing / electronics when only on half throttle. (The onboard computer caters for wheel size up to 20" I believe, but not larger).
If I manually switch down to make sure that its not gearing itself too low at slow speeds it doesnt happen. Its spoiling what is an otherwise pleasurable, comfortable and capable experience!
So what could it be???
Advice welcomed.
Thanks
I had the coil packs and plugs replaced a while ago which sorted a misfire issue, but now I have a sort of 'juddering' normally experienced at low revs, with little throttle and normally in 3rd gear.
Im wondering if its something to do with the oversize alloys that came on the car (22" tech style), and its messing with the gearing / electronics when only on half throttle. (The onboard computer caters for wheel size up to 20" I believe, but not larger).
If I manually switch down to make sure that its not gearing itself too low at slow speeds it doesnt happen. Its spoiling what is an otherwise pleasurable, comfortable and capable experience!
So what could it be???
Advice welcomed.
Thanks
First thing is are all the tyres the exact same make and model number - this is absolutely critical since the transfer box will try and compensate for the difference in height - even 2mm difference in tyre size can cause damage to the transfer box.
Second, carden shaft also is a common issue
Third, gearbox itself can be the issue, but normally you would see errors in the TCU/DME that would point to something more serious.
If you have done coils, plugs and MAF then from engine side that should be it covered.
Do you get a low speed "clunk" from under the car in the middle - put the car in park, then reverse and put the brakes on - it you get a clunk noise then either tyres or carden shaft would be where to start.
BTW, really should run 20in wheel - anything above is not worth it and can cause more problems.
Second, carden shaft also is a common issue
Third, gearbox itself can be the issue, but normally you would see errors in the TCU/DME that would point to something more serious.
If you have done coils, plugs and MAF then from engine side that should be it covered.
Do you get a low speed "clunk" from under the car in the middle - put the car in park, then reverse and put the brakes on - it you get a clunk noise then either tyres or carden shaft would be where to start.
BTW, really should run 20in wheel - anything above is not worth it and can cause more problems.
Thanks chaps...
I would say its 'always' in 3rd, and it had crossed my mind to get the fluid checked anyway - what can be reset electronically that might sort it?
The 22" rims look great but are proving to be a right royal pain in the arse to be honest. Where I am, the curbs are high, the potholes are frequest and the road surfaces change like the wind...
Im assuming 20" is going to get me some increased comfort?
Going back to the gearbox thing - I wondered whether last winters horrific temperatures may have done some damage. It was minus 18 or so here and Im guessing the gear oil would have been like treacle. I didnt notice this 'judder' straight away then, or if I did I put it down to my lack of experience with the car thinking it was just the mighty V8 thumping in to action to haul me forwards...
Dont really need any big bills right now, but I think the wheels have to go, and the gearbox needs a bit of a once over from someone who knows...
I would say its 'always' in 3rd, and it had crossed my mind to get the fluid checked anyway - what can be reset electronically that might sort it?
The 22" rims look great but are proving to be a right royal pain in the arse to be honest. Where I am, the curbs are high, the potholes are frequest and the road surfaces change like the wind...
Im assuming 20" is going to get me some increased comfort?
Going back to the gearbox thing - I wondered whether last winters horrific temperatures may have done some damage. It was minus 18 or so here and Im guessing the gear oil would have been like treacle. I didnt notice this 'judder' straight away then, or if I did I put it down to my lack of experience with the car thinking it was just the mighty V8 thumping in to action to haul me forwards...
Dont really need any big bills right now, but I think the wheels have to go, and the gearbox needs a bit of a once over from someone who knows...
A911DOM said:
Thanks chaps...
I would say its 'always' in 3rd, and it had crossed my mind to get the fluid checked anyway - what can be reset electronically that might sort it?
The gearbox software learns how the car's driven so it could be a bit confused - resetting it can't do any harm (it'll re-learn how you drive the car, which would maybe be useful if you haven't had it long).I would say its 'always' in 3rd, and it had crossed my mind to get the fluid checked anyway - what can be reset electronically that might sort it?
A911DOM said:
Have you had something similar happen, or just want to reset for your own peace of mind?
I do a LOT of city centre driving, so the box has learnt that it is slow stop start granny driving. If a combo of key turns resets to factory settings i feel it may feel more livelythegoose said:
Normally in 3rd, or always in 3rd?
If "normally" then get the propshaft (comomon weak point) checked, if "only" then look at the gearbox - either reset the electronics, change the fluid or both, and see if it improves.
Having been out on several little jaunts today, I have noticed it mainly in 3rd and 4th and at low revs when at low speeds and then trying to accellerate. The gears tend to be a little slow changing back down (4,3,2) for my driving, and it very quickly gets in to 5th or 6th when sauntering around - which if I decide I want to take off means a slight delay in the kickdown. If "normally" then get the propshaft (comomon weak point) checked, if "only" then look at the gearbox - either reset the electronics, change the fluid or both, and see if it improves.
If I give it plenty of pedal I dont get any of these vibrations, it just powers through it... I had wondered if it was just a sort of 'flat spot' in the engine performance.
Im gonna have a word with Autowerke next time Im back and get him to check the prop, cardan shaft (?), change the gearbox oil and also try and get the memory reset... Hopefully covering all the bases will sort it.
Im going to look into to swapping the wheels for a 20" set to try and compensate for the s
t road surfaces I have to contend with (whilst at the same time falling within the recommended factory parameters) and see what difference that makes too. Well it didnt take long for the ugly truth to unveil itself with my 'juddering' issue.
After fighting with the Porsche garage near me to accept the car (I'll make comment on this at a later date). It turned out that my propshaft/transaxle (whatever you want to call it) had given up the fight. Between my initial post here and today it had developed into a horrible judder which was more akin to someone flapping a welly about under the middle of the car, whilst physically shaking the whole car under accelleration.
Not a cheap fix, but will hopefully resolve all those issues I had been experiencing.
ALSO, someone in this thread was asking about re-setting the gearbox memory:
This can be achieved either by plugging the car in to the dealership computers - OR BY DISCONNECTING THE BATTERY FOR ABOUT AN HOUR!
After fighting with the Porsche garage near me to accept the car (I'll make comment on this at a later date). It turned out that my propshaft/transaxle (whatever you want to call it) had given up the fight. Between my initial post here and today it had developed into a horrible judder which was more akin to someone flapping a welly about under the middle of the car, whilst physically shaking the whole car under accelleration.
Not a cheap fix, but will hopefully resolve all those issues I had been experiencing.
ALSO, someone in this thread was asking about re-setting the gearbox memory:
This can be achieved either by plugging the car in to the dealership computers - OR BY DISCONNECTING THE BATTERY FOR ABOUT AN HOUR!
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