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Matt, Mechanical Engineer
Category: Car
Satisfied Customers: 20383
Experience:  BEng hons Mech engineering, in auto industry 22 years
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I have Range Rover sport TDV6 3.0 2009 (2010 model) and have

Customer Question

I have Range Rover sport TDV6 3.0 2009 (2010 model) and have noticed a vibration / resainance at 90 mph if I slow down it goes away, there are no warning lights on the car but no loss of power however it is quite alarming. recently had 4 x new tyres and balanced. any ideas please.
Submitted: 11 months ago.
Category: Car
Expert:  Matt replied 11 months ago.
~Hello One other thing to check for which isn't covered by a wjheel balance check is out of round or bent wheels, if you use a dial gauge on the axle to measure the run out on the wheel rim this will ensure that the wheels are round and true also check for worn drive shaft joint - typically these won't produce any vibration unless badly damaged but they can be noisy or 'clonk' for a long time beforehand, turn the steering to full lock and look at the drive-shaft rubber boot there should be no rips or tears in it and the suspension should be clean and dry of any grease. If you reverse at a reasonable speed with the steering on full lock a worn joint will 'click'. also check for worn mountings - check the tightness of the engine and gearbox mounts and their condition - this is best done by using a jack to take the weight of the engine off the mounts and seeing if any cracks or splits open up in the rubber.Also check the tightness of the mounts bolts or it coudl be a broken or defective driveshaft vibration damper - some models feature a rubber mass about halfway along the driveshaft - this functions as a vibration damper so 'tuning out' vibration - the rubber needs to be not cracked and the damper firmly fixed to the shaft and running true - anything other than this and the entire shaft will have to be replaced as they are bonded in place Propshaft : then I'd suspect that the propshaft either has a worn joint or the centre bearing is worn or its out of balance you can easily check for for any slack in the propshaft joints by twisting either half by hand and feeling for any play as there should be virtually none the centre bearing is quite loosely mounted so this can be moved normally but if you can run the car in gear with the wheels off the ground and then feel the centre bearing housing for vibration if there's any then consider replacing the unit and then look along the propshaft for any signs of a missing balance weight as these take the form of little 3/4" squares that are welded onto the shaft - as they are only tacked on they can sometimes come loose and be lost resulting in the shaft being out of balance - if a joint is worn this can also shake them loose so if a joint is replaced its good practice to have the shaft re-balanced afterwards
Expert:  Matt replied 11 months ago.
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