Quote:
Originally Posted by lenw
No creaking. It's more like someone bumping the underside of driver front with a hammer while going over washboard or road with small bumps. It's fine over big bumps or down the driveway curb. It's fine for my morning drive because it sat in a warm garage all night. During the day, after it reaches ambient temperature(5 degrees F or colder), it starts knocking. It does it in normal or sport mode. I've heard stuff like this in domestic crap i've had but didn't expect it from my BMW.
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You're comparing what's called high frequency vs. low frequency bumps.
I don't know how BMW tuned the X5's suspension, but they may have tuned it in a way to stiffen quickly in response to small bumps, and to respond less quickly to low frequency big bumps. Driving down your driveway curb, even though it may technically be a high-frequency bump, may be taken at a low enough speed in which the suspension reacts to it as if it's a low frequency bump and hence it does not become taunt.
The hammer description you're describing doesn't sound correct. It should be a "relatively" solid thud, or solid bang. You shouldn't feel any sense of looseness.
You might want to have them check it out, make sure everything is properly lubricated, no wheel bearings are out of whack, and your shocks are in good shape. Also, check your air pressure in your tires, etc. Make sure they're not overinflated (who knows, it's possible).
Also, what size rims do you have? Naturally if you have 20 or 21" rims with low profile tires, there's little you can do to escape "some" of what you're describing.