My 2005 Range Rover Sport Supercharged has suffered consistently with a knocking noise from the steering and front suspension. More recently it's developed a squeaking noise from the suspension on cornering or swift steering adjustments?
The anti roll bar bushes have been replaced several times to no avail and most recently the steering wishbone mechanisms were also replaced. The latter had some short term benefit but not complete correction but now the faults are back in their full glory!
Do you also get squeeking on bumps or when the suspension moves up/down/left/right or just on cornering? If so sounds like ball joints, they normall make a squeeking/creeking like old wooden floors when going bad or needing greased. If it only happens with the steering then you may have a bad power steering pump or rack & pinion. Kinda hard to know for sure without actually being there but all are possible causes for your problem. Check them all to rule out any or all..
For Vibration at highway speed this is caused by a valve in the steering rack that controls the amount of fluid to the variable speed steering. Owners with the vibration problem reported that if you accelerated slowly from a dead stop, the vibration did not occur. If you floored it, vibration every time. It appears that the valve could not keep up with a rapid change and malfunctioned (55 mph is where it is programmed to make a major adjustment in steering tension). The defective steering would then shake the car out of balance explaining why it would drive well for about a week after balancing, then vibrate again. The fix was a replacement part for the defective valve in the steering box. For Vibration felt at Standstill or very low speed This vibration now appears to be a separate issue from the valve problem mentioned above.You get vibration through the steering wheel with the car in Drive and your foot on the brake pedal.There is no vibration when you take your foot off the brake or switch into neutral or park.The vibration worsens a little when the car is warm and is lessened somewhat when the AC is turned on and the idle RPM increases. It appears that the base idle speed (without the AC turned on) was set too low from the factory. The idle speed has been reset and the vibration now seems normal. Turning on the AC now only causes a blip in the RPM as opposed to a jump. Another cause of low speed vibration is the driveshafts. The vibration felt at low speeds is most definately the drive shafts that need replacing.
The most common source of this type of noise is the suspension control arm bushings, this is not the sway bars but the arms that the provide the up and down movement of the suspension, also a source of noise is the rivets that hold the front pieces of the frame together, this would and could cause a knock type noise and at very least a pop or loud creak, to see if you have this problem lot at the large rivets that hold the frame pieces together, if they are loose and moving there will be rust around the heads of the rivets..
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I don't think that your response about the knocking suspension and therefore the loose rivets correction is accurate.The car has an electronic Dynamic Response Control Unit which apparently when disabled (tho not desirable) improves although does not completely eradicate the problem. Rivets I don't think so!
The last expert post about the suspension noise and knocking referred exclusively to a steering vibration that is not relevant to my car.The knocking noise comes from the suspension not steering I believe and the squeaking comes lock to lock movement in the steering rack.
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