Question about 2006 Ford Fusion
This could be a combination of things. I'll suggest them and see how you go.
The tyre pressures have the most effect on road noise. Strangely there is more transmitted noise when tyre pressures are correct. Under inflation cuases a cushioning effect, whereas over inflation can make the tyre profile balloon reducing road contact.
Check that they are in limit.
Tyre tread profile can produce a humm if there are straight lateral bars. Good designs use offset bars to reduce this effect.
Cover any loadspace, and ensure sound deadening panels are in place.
Shock absorber top and bottom bushes come in different relilliancies. Hard provide tighter handling - but allow more road noise, soft absorbs noise, but allows more roll.
These bushes harden over time - thus transmitting more noise.
Shock absorber seals can swell enough to make a shock "sticky" - thus transmitting more noise.
Other suspension bushes likewise harden and become more solid with age.
So, - If it is bothering you, Check tyre pressure and condition. Cover loadspace with sound deadening material - A rubber mat in the boot works wonders.
Inspect rear shocks for wear/ corrosion.
Remove and replace bushes with new.
Replace shocks with new if required.
Inspect suspension bushes, & replace if cracked or perished.
This should solve the problems for you.
Posted on Jul 04, 2008
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