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Hopefully i can help..
When exactly does this noise seem occur? ie:- at speed? / cornering? / under braking? / does the noise change when the clutch is depressed? / Can noise or problem be felt through steering or pedals?
Does it happen when stationary?
It happens mainly at higher speed, it sounds like a tennis ball in a cardboard box, it comes from the back and it is a constant drumming noise. Checked tyre pressure, 36 all round, parcel shelf, spare tyre and boot floor space, all ok. Tyres factory fitted Hankook
Hi..thanks for your reply..
Ok...if both tyres on the back are fine pressure wise..but doesnt mean to say that one tyre could be faulty..in that either lost weights/tread/ tyre wall damage running the tyre out of balance which would most likely be felt at high speed.only will you know that once the tyres are balanced checked or swap tyres over from the front to that back and vice versa and then test drive again to see if the noise or problem has shifted....then it likely you maybe have suspension issue..this would involve haveing to check for movement at any of the mountings/bushings aswell a check of the both shocks - too check for handbrake cable security aswell as as braking components on the rear are secure..also each wheel will have to be rotated by hand and felt for any movement or rummbling due to failing rear wheel bearings.aswell as exhaust security and rear wheel arch lining for security.but first if possible try the tyre swap and se if the problem shifts or stops..if no then you know the tyres are ok and the problem will likely lay with either of the above areas which need to be inspected..I do hope this helps
We appriciate your help but most of the items you list have been checked out by my local Hyundai agent in Preston. My final comment after reading Autocar magazine is the KIA ceed says it does produce excesive tyre noise and as KIA are produced on the same production line as Hyundai we are leaning towards changing tyres on our car.