Originally posted by craig1410
quote:
Originally posted by MakeEverything
Wheel bearing?
Have you checked?
Yes, I did get a knocking noise on overrun on mine, not vibration though.
Either way, worth a quick check of the wheels I would think. Or you could just ignore it and I'll not contribute again.
[Edited on 14-1-12 by MakeEverything]
Russell - 14/1/12 at 09:21 AM
Can't help you with saying what the cause is but maybe I can help you to eliminate some stuff...
I recently replaced an inner CV joint on my VW Polo due to wear. The symptoms were the exact reverse of those you describe i.e. excessive vibration
but only when accelerating and nice and smooth on the overrun.
Further to your comment above, dual mass flywheels were fitted to VW group vehicles starting in the 1990s so it's possible you have one. Smaller
petrol engines tended to have solid flywheels though. Again, my experience of a failed DMF is excessive vibration on acceleration, not on the
overrun.
Russ
adithorp - 14/1/12 at 01:09 PM
Gut reaction from your description (heard thousands of descriptions and traced cause over the years) would be a rear tyre out of shape. Experience
also tells me that it could be dozens of things.
Start with the simple stuff. Jack it up and check the tyres don't have any lumps/bumps on them and check for play in the steering and suspention
joints, then get the wheel balance checked.
owelly - 14/1/12 at 01:48 PM
I'd be looking for loose ball joints, track rod ends and stuff that could cause the wheel assembly to wobble when not under load. Wheel bearing is a possubility but if it was that bad, you'd notice excessive brake pedal travel.
phelpsa - 14/1/12 at 02:01 PM
Ball joint would be my guess. Fine when you load it up, wobbles around when unloaded.
craig1410 - 14/1/12 at 02:47 PM
quote:
Originally posted by MakeEverything
quote:
Originally posted by craig1410
quote:
Originally posted by MakeEverything
Wheel bearing?
Have you checked?
Yes, I did get a knocking noise on overrun on mine, not vibration though.
Either way, worth a quick check of the wheels I would think. Or you could just ignore it and I'll not contribute again.
[Edited on 14-1-12 by MakeEverything]
Richard,
It sounds like I have somehow offended you or given you the impression that I don't value your contribution. Having read my reply again I'm not quite sure how I managed it but if you are somehow offended then it was not my intention. Perhaps you misinterpreted my tone or something.
I've not been out to look at the car yet but rest assured I will be checking everything suggested by everyone until I find the cause. My gut feel is that it is an inner CV joint but there have been many suggestions made with good reasoning and I'll check each of them. That's why I posted my question in the first place. I was hoping to hear from someone who had the exact same problem on an Altea or Golf or equivalent Audi but I'm not that lucky it seems. It was a long shot...
Thanks to all who have posted, I'll let you know what I find.
Craig.
MakeEverything - 14/1/12 at 03:48 PMquote:
Originally posted by craig1410
quote:
Originally posted by MakeEverything
quote:
Originally posted by craig1410
quote:
Originally posted by MakeEverything
Wheel bearing?
Have you checked?
Yes, I did get a knocking noise on overrun on mine, not vibration though.
Either way, worth a quick check of the wheels I would think. Or you could just ignore it and I'll not contribute again.
[Edited on 14-1-12 by MakeEverything]
Richard,
It sounds like I have somehow offended you or given you the impression that I don't value your contribution. Having read my reply again I'm not quite sure how I managed it but if you are somehow offended then it was not my intention. Perhaps you misinterpreted my tone or something.
I've not been out to look at the car yet but rest assured I will be checking everything suggested by everyone until I find the cause. My gut feel is that it is an inner CV joint but there have been many suggestions made with good reasoning and I'll check each of them. That's why I posted my question in the first place. I was hoping to hear from someone who had the exact same problem on an Altea or Golf or equivalent Audi but I'm not that lucky it seems. It was a long shot...
Thanks to all who have posted, I'll let you know what I find.
Craig.
Hi Craig, no not offended at all. Just a bit puzzled as to why you asked me what you did, and no-one else! I was adding to a growing list of things that I would check. I've seen bearings do what you describe on large fans, the torque from slowing causes them to twist inside the play that they have and judder when worn.
To be honest, it could be a multitude of things, or even a combination. I would start at e bearings, bushes, tyres etc and go from there.
craig1410 - 14/1/12 at 04:30 PMHi again,
Okay finally got around to having a quick look at the car and it looks to be engine/gearbox mount related.
If I open the bonnet and grab the engine and push and pull firmly there is a lot of movement, perhaps an inch or so and a sound coming from down near the gearbox which could be a loose bolt moving around or it might be something broken or a rubber mount failed. I can't really see very well as it is underneath the battery box and I don't want to start dismantling now without knowing what I'm likely to find. I've got the SEAT workshop servicing software "Elsawin" so I'll have a look at that and see how the mountings are arranged. Then I can have a proper look tomorrow once I know what I'm letting myself in for.
@Richard, no problem mate. I did actually respond to each and every post up to and including yours but it was starting to feel as if I was responding a bit too quickly so I decided to back off until I was in a position to actually do something about it. Sorry if this gave you the wrong impression. No hard feelings.
Thanks all,
Craig.
T66 - 14/1/12 at 06:28 PMOne of the rear wheels on my Saab lost all its weights
Up to 50 nothing to note, came on as a gentle thrum between 60 and 70. And was easily low enough to ignore.
By 70+ up to 90 it sounded like and engine undertray hanging down in the air stream under the car, and vibrated like a PIG !
Took it to HiQ and got them to balance the fronts, both were fine, when I told them to do the rears the fitter fell about laughing, pointed out he had never needed to balance rears before.
Ate his words as the rear was missing 60g of balance weights. Once fitted, the vibe disappeared completely.
When running the car at speed it was very hard to tell what was going on, ie whether it was front or back, driving or overrun etc.
T66 - 14/1/12 at 06:29 PMPS - Ignore my last post
craig1410 - 15/1/12 at 05:25 PMHi,
Just a quick update.
I took the battery and battery support out today to get a good look at the engine mount and it does appear to be pretty knackered. It creaks when moved and I can move it by finger pressure a bit too easily. I'm assuming that these mounts should be able to resist finger pressure without moving much? I've never seen a new one before hence the question.
So unless anyone comes back and tells me that they are supposed to move easily by hand pressure then I shall order a new one (about £45 from a quick check here http://www.hansautoparts.co.uk/1K0199555NMounting.aspx ) and fit it next weekend. It should be okay until then I think as my wife only drives about 10 miles a day on local roads so vibration at speed isn't a big problem for her. To help it stay together I squirted a dose of glue into the gap between rubber and metal. I doubt if it will help much really but might firm it up a tad.
Only problem I have now is that my airbag warning light has come on, presumably due to the battery being disconnected. I've got a VAG COM cable but my daughter had the only Windows laptop we've got left and she's away from home at university. I think she's home in a couple of weeks so hopefully I can reset the fault code then. I'm hoping that is all that is required - anyone seen this happen before?
On a positive note I got the oil and filter changed which is a bit overdue and completed a few other service items.
Cheers,
Craig.