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'11 Mondeo rough ride around 30mph

Just got an '11 Mondeo 2.0 TDCI Powershift 'auto'

I noticed a vibration noise at around 30-40mph, but nothing through the wheel. The noise is in time with the rotation of the wheels, it sounds like it's coming from the nearside. Took it back to the dealer who went for a spin with me, they rebalanced all the wheels, which seemed OK at first, but it came back. Went back again, another spin with a different mechanic, he diagnosed a wheel bearing which was replaced under warranty.

I still get a noise though at 30ish, above 45 it goes & it's a nice smooth ride. If I drop it into neytral & coast the noise is still there. The garage is a main Jag dealer & the car was a trade in from the first owner with full FSH.

Any ideas what it could be? A mate says a wheel could be out of round, or it could be a CV joint?

The dealer is over 4 miles away so I'd like to nail down the problem before I go back.

Cheers

Reply to
ureds
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Has it got a spare wheel?

If so, rotate that around the four corners, taking one tyre out at a time, and see if that makes it go away. If so, that tyre's deforming.

Reply to
Adrian

Liking that idea...

Reply to
ureds

Is it just a noise, or a vibration and noise?

Does it change if you apply the brakes?

Reply to
Dave Plowman (News)

Just a noise comes in at around 25-30, gone at 50, It can increase in volume under braking, especially on smooth tarmac. Due to the shitty traffic I commute in, getting it above 30 to analyze it doesn't happen much. Computer has 15mph average at present.

Reply to
ureds

Duh, make that 45 miles ...

Reply to
ureds

First guess would be a wheel bearing. But it isn't always easy to know which one.

Reply to
Dave Plowman (News)

I've had this sort of thing on Vauxhalls, and the local garage says its the way the tyres wear. The ones originally fitted by Vauxhall wear in the shape of 50p pieces and produce a noise exactly like a worn wheel bearing.

Perhaps this is to encourage their tyre sales!

Reply to
Graham J

Is it worse if you are turning one way or the other?

If it's a wheel bearing, generally the noise gets louder when you turn the opposite way to the dodgy bearing and the load on the bearing increases.

Chris

Reply to
Chris Whelan

2nd visit to the dealer & they replaced the N/S front bearing. Have stuck the spare on this wheel, still getting the noise..

The front tyres are quite worn, O/S is almost on the TWI, N/S has about 1mm more. I may swap the rears over.

Reply to
ureds

It's really time to change the tyres then. Anything below about 3mm means less grip in the winter weather.

Reply to
rp

+1

Chris

Reply to
Chris Whelan

I'm on that. Done the first wheel replacement still go that vibration, will do the others. I'll get back on to the dealer after the new tyres are on & I still have the noise.

Reply to
ureds

Pending me getting a couple of tyres next week (happy for any recommendations on brand)I swapped the almost new rears to the front & vice versa. The noise is now definately behind me when it was in front before. Seems I have it nailed down to a specific wheel. The ride is a lot better with fresh rubber at the front too.

Reply to
ureds

2 new Goodyear Efficient Grips & not a vibration to be felt. 30 years of motoring & never had that problem with tyres at the end of their life, even when 1mm was the legal limit.
Reply to
ureds

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