Coilovers clunking or rattling? Trouble Shooting Guide.

October 21 2022, by Andrew Baird, 5 min reading time

Suspension Noises?

The coilovers arrived and have been installed, but you hear squeaks and clunks that weren’t there before. This can be annoying, having to deal with unexpected problems. In this post, we’ll help list possible problems and fixes as a way to educate those that haven’t upgraded their suspension yet. For those that have already installed the new suspension and are having issues, we hope this post will help as a troubleshooting guide so that you can resolve the issue and start enjoying your new suspension.

What could it be?

The first thing to consider is that bushings, most mostly made of rubber, making up a crucial part of your suspension. The bushings provide a cushion for the suspension and help to reduce NVH (Noise, Vibration, & Harshness). Bushings help to keep the suspension comfortable, quiet, and long lasting.

However the bushings are wear & tear items that will eventually need to be replaced. Some of those bushings include:

Upper Strut Mount Bushings
Lower & Upper Control Arm Bushings
Anti Roll or Sway Bar Bushings
Drop Link or Sway Bar End Link Bushings
Trailing Arm Bushings
Coil Spring Isolators

When bushings become worn out, they can develop excess play which reduces performance and will cause the suspension to become louder. When suspension components like coilovers or stiffer sway bars are installed, the stiffer added component can make any existing issue more evident or help in making worn components wear to the point of failure or noise.

Where do I start? Ask yourself the following:

When did the noise start?

Most of the time when we get a call or an email regarding noises happening immediately after installation it will, in most cases, point directly to the installation itself. If your new suspension has not been installed correctly or parts are worn out, it will almost always result in noise and performance issues. Check the installation against installation manuals and factory component orientation to ensure everything is being installed correctly.

When something is changed such as installing a stiffer sway bar or a new coilover suspension kit, it can alter the dynamic of the suspension and put more stress on worn and failing bushings. Check the bushings mentioned above for obvious signs of dry rot, cracks, or worn/torn sections. If any of these issues arise, it is time to replace the problematic bushing(s).

What type of noise can we hear?

We want to assess the type or kind of noise.

Clunk – If there is a clunk and you have confirmed that installation is correct, there is play somewhere in the suspension or there may be suspension components coming in contact with other components. The play often comes in the form of a worn bushing(s) while components contacting each other often happens after a vehicle’s ride height is raised or lowered.

As mentioned above, look for failing bushings and consider replacing the likely worn bushing(s). In the case that there is contact between suspension parts, you’ll need to assess what parts are contacting and how the suspension geometry can be changed to move these components away from each other. This can often be done with adjustable components such as adjustable end links, adjustable control arms and/or adjustable sway bars.

Squeak – Squeaks, most often, originate from rubber components or contact points where two components of the same material are touching another. Check all rubber components for wear or to see if they need to be lubricated. When lubricating bushings, lubricants like silicone grease will be longer lasting than other general lubricant options like WD-40.

If you are having two components of the same material (ie steel to steel or rubber to rubber) touching and making noise, ensure that you have installed all components in the proper order. It isn’t common to have two like materials touching as there will often be buffer like rubber or plastic between metal components. A good example of this is a spring to control arm contact point. There almost always will be a rubber isolator between the two. Check all contact points for problematic areas.

Popping – Specifically when steering, if you’re hearing any popping noises, it is very likely that the upper strut mount bearings are worn out. These bearings help to keep the suspension moving together and when they are worn out, it causes the top or bottom of the spring to not turn with the rest of the suspension with movement of the steering wheel. We highly recommend replacing any worn upper strut mount bearings as soon as possible as damage can be done to other suspension components, including the shocks and springs of the vehicle.

In the end, seeking the help of an experienced professional will be your best bet in resolving any issues. However, several of the mentioned fixes above can be done by those that enjoy a hands on approach with the knowledge and skill to do so. This will save you money in the long run.

Have any questions?

Email ab@raceland.com