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Intermittent wobble?

scam75

scam75

Well-known member
Afternoon all

I have a bit of a strange issue. Car sometimes has a bit of a light shudder through the steering wheel between 70-80mph. Manifests itself when braking down through 80-70mph. There is no steering wobble or brake shudder below 70 or above 80.

Other times this phenomenon is not there and all is well. I am a bit perplexed, I can't seem to think of anything that would cause an intermittent shudder?

Any ideas?

Stuart
 
I have the same thing. Seems to only be a problem for the first 20 mins so i'm assuming it's a slight flat-spot on the tyres that rounds off once the tyres are warmer.
 
Could be wheel balance related Craig. It's the phenomenon of it coming and going that's foxing me. You would think a wheel needing balanced would be a constant.

Simdel - Interesting, can't say I've noticed if it's when tyres hot or cold. Definately wasn't doing it from cold yesterday. Will monitor that.

Stuart
 
Could be sticking piston but fronts recently refurbed and seem fine and rears were brand new a couple of years ago. It always brakes straight and no uneven heat build up.

Stuart
 
It does, sometimes drastically i have it first hand so much so that the car was undriveable, sticky front brake pistons was the root cause !
 
If it goes away shortly like Simon says mate I would say flat spots but if it is persistent when it is there then it is definitely geometry related if not the brakes. Could be balancing or even a bucled wheel. Doesn't to be much out of kilter either.
 
Had a similar issue on my turbo Stuart, on investigation it appears to be the intermediate steering shaft with the UJ at either end. Has to be at just the right angle to set the wobble off, which can then fade shortly after. At most speeds it's not noticable, and sometimes I can't get it to do it at all. There is play evident and a 'notch' part way through the manipulatioon of one of the UJ's. Seems if I drive and the UJ falls into this 'notch' (very very small window of error) then I can get the wobble, for all other angular positions it is fine.

Word of warning though, if you're going to buy a replacement part from OPC, ALL UK stock is currently no good ! I purchased one two weeks ago and had an issue fitting it, found it to be manufactured incorrectly. Reported back to my OPC and they sent my pics to Porsche UK who have now checked UK stock and confirmed they are all in that condition. Apologised profusely, but can't sort it out till next week when Germans are back from national holiday.

So, car is currently out of action [:mad:]

Hope this helps.

Mike
 
Thanks guys. My steering shaft is fairly new and ok I think as are my steering arms.

I am going to get the wheels on a balancer later today and make sure the nuts are torqued correctly before going any further.

I have noticed that from cold the issue is not there, it takes a couple of miles to start happening then it is constant?

What is the torque setting for the wheel nuts?

Cheers

Stuart
 

ORIGINAL: mike220

Had a similar issue on my turbo Stuart, on investigation it appears to be the intermediate steering shaft with the UJ at either end. Has to be at just the right angle to set the wobble off, which can then fade shortly after. At most speeds it's not noticable, and sometimes I can't get it to do it at all. There is play evident and a 'notch' part way through the manipulatioon of one of the UJ's. Seems if I drive and the UJ falls into this 'notch' (very very small window of error) then I can get the wobble, for all other angular positions it is fine.

Word of warning though, if you're going to buy a replacement part from OPC, ALL UK stock is currently no good ! I purchased one two weeks ago and had an issue fitting it, found it to be manufactured incorrectly. Reported back to my OPC and they sent my pics to Porsche UK who have now checked UK stock and confirmed they are all in that condition. Apologised profusely, but can't sort it out till next week when Germans are back from national holiday.

So, car is currently out of action [:mad:]

Hope this helps.

Mike
Click to expand...

ORIGINAL: TTM

Mike, what's wrong with the manufacturing of the shaft?
Click to expand...
Would love to see some pics and more info on this. I bought one these from an opc last year...
 
Bought new torque wrench, all wheels were over 130nm so backed them off and torqued up to correct setting and all seems to be well. Very sensetive creatures if that's been the cause! I can understand if a nut was loose but they were all too tight, maybe at different torques though as were tightened without torque wrench before. [&:]

Won't celebrate just yet as the problem was intermittent although more there than not there. Will see how it goes over the weekend.

Cheers

Stuart
 
Have noticed the same point Simdel makes.
For the first 5 miles after an overnight parking, and more so in cold weather, on either conti sports or T1R's, there is a small steering wobble which eventually disappears.
I also put it down to the flat spot theory, coupled with steering geometry which is very "live" on a 944.
On an A4 or A6 I could take the strut out on a kerb, and not feel anything thru the wheel[8|]
interesting to hear some one else noticed the same thing.
George
944t
 
ORIGINAL: Jonny944CS


ORIGINAL: mike220

Had a similar issue on my turbo Stuart, on investigation it appears to be the intermediate steering shaft with the UJ at either end. Has to be at just the right angle to set the wobble off, which can then fade shortly after. At most speeds it's not noticable, and sometimes I can't get it to do it at all. There is play evident and a 'notch' part way through the manipulatioon of one of the UJ's. Seems if I drive and the UJ falls into this 'notch' (very very small window of error) then I can get the wobble, for all other angular positions it is fine.

Word of warning though, if you're going to buy a replacement part from OPC, ALL UK stock is currently no good ! I purchased one two weeks ago and had an issue fitting it, found it to be manufactured incorrectly. Reported back to my OPC and they sent my pics to Porsche UK who have now checked UK stock and confirmed they are all in that condition. Apologised profusely, but can't sort it out till next week when Germans are back from national holiday.

So, car is currently out of action [:mad:]

Hope this helps.

Mike
Click to expand...

ORIGINAL: TTM

Mike, what's wrong with the manufacturing of the shaft?
Click to expand...
Would love to see some pics and more info on this. I bought one these from an opc last year...
Click to expand...

Sorry boys, not been on the forum over the weekend. Issue is a mis-alignment of pinch bolt at one end to the other. Effectively meaning that you're steering wheel would be 180 degrees out if you fitted the pinch bolts where they needed to go on both the rack and column shaft ends. I do have a pic next to the original one, which I'll try and post in a minute (if I can).

The bad news is, I now have everything back together but my intermittent wheel wobble is still apparent (above 60 ish [;)] mph). Done plenty of miles over the weekend after doing my silicone Vac lines, and on a straight road I can get the wobble come on if the surface is bad or I have unweighted the front by giving it the berries, then settle again no problem. A bump further down the road will see it come back etc. etc.

Frustrating isn't the word. Wheel balance will be done this week, and I know I need an alignment after changing suspension and castor bushes etc. so hoping these two things will bottom it out finally - it's starting to annoy me now [8|]

Cheers,

Mike

 
Spot the problem........................


IMAG0429.jpg


Edited to sort out the mahoosive pic I just uploaded haha - Well I tried, struggling to resize it. You get the idea anyway.........

Mike
 
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