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02-22-2015, 02:55 PM | #1 |
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Knocking noise in front suspension
Hello. I have a 2007 E86 with two issues that I need your help on that are related to the suspension. The car has 48k miles on it. It also has Vorshlag adjustable camber plates (about 20k old) and a front strut bar. Everything else is stock.
1) When I drive over dips in the road (potholes, or drops between sections of pavement) I hear a sharp knocking noise. The best I can tell is this occurs when the wheel drops from one level to a lower level in the pavement. The noise does not occur on rising travel. I looked under the car, and everything seems solid, and the FCAB bushings do not look cracked. Could something have got loose within the camber plates after driving on them in city streets over a couple years? 2) And maybe it is just me getting older, but the car seems to be riding rougher lately. Even the slightest gaps in the pavement transmit through the car, to my seat and back. It's getting to the point where I just don't like to drive the car anymore unless it is on the smoothest pavement. Could it be that I need to replace all the suspension bushing on the car? I know that when rubber ages, it loses some of its elasticity. I also know that when I replaced the stock camber plates with the Vorshalgs, I expected some NVH, but it seems to be worse now. Should I be replacing the bushings on a 48k mile, eight year old car? Thanks for any comments and suggestions. |
02-22-2015, 04:48 PM | #2 | |
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02-22-2015, 06:04 PM | #3 |
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Check your motor mounts
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02-25-2015, 05:31 PM | #4 |
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I have TC Kline camber plates in mine and had a similar knocking noise begin at about the 2 year mark. Mine have replaceable bearings, but the problem was actually a mushroomed washer which I replaced with a redesigned washer from TCK that was slightly larger diameter and thicker.
Re your ride degradation, could be shocks/struts but it could also simply be aging of the tires...especially if they are run-flats. |
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03-02-2015, 01:29 PM | #5 |
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At 48K miles your front control arm bushings are likely shot, whether they look it or not. Plus the car is likely over 7 years old now, time to replace it, whether that is the source of your noise or not. Could very well be the source of your ride degradation (besides the fact that the dampers are likely shot as well, or at least, far less effective than when they're new).
Motor-mount related issues should show up while idling at a light as a vibration that can be felt throughout the chassis, but again, if you haven't done so already, the bolts on the mount should be replaced. I would replace those two parts above first and foremost because they're probably due anyway. If that doesn't solve the issue, it's likely that a bolt attaching the triangulated strut brace to the firewall may have come loose. It's a pretty common problem on earlier Z4 Coupes but is suppose to have been fixed for MY2007. Inspect the bolts at the firewall and at the strut side, make sure they're properly tighten with zero slack. If the above STILL did not solve your problem, then it's likely something has worn out in the camber plate. It shouldn't, but it's not out of the realm of possibility. If you still have your stock strut hats, swap them back and see if the noise goes away. If it does, then you've isolated your culprit. The LAST possibility I would check, is check your sway-bar mount. It's not common, but it's a failure point in the E46 chassis and it is also a weak point on the E85/E86. But typically I see this sort of failure on cars with larger aftermarket sway-bars or cars track HEAVILY or both. The twisting forces of the bar literally rips the bolt out of the mount.
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