Finding out noises from your vehicle often is never reassuring, so discovering noises on your Lexus IS suspensions when you go over a speed bump can be stressful. This symptom may be a sign of a insignificant issue as well as a warning of a much larger repair to come. Whatever the case, it is fundamental to check the cause and take the necessary actions to resolve the issue, it is with this goal in mind that we wanted to write this document to help you see more clearly. We will first see the possible causes for a crack when the speed bump passes, after that, what can be the cause of a squeaking noise when a speed bump is being passed and finally what to do if you have another noise when a speed bump is passed.
Suspension cracking noise Lexus IS
Check Lexus IS suspension
If you notice a suspension noise when you pass a speed bump on your Lexus IS, and it is categorized by a “clack” or cracking, it is highly possible that your suspension block is the cause of it. In fact, it may be the suspension cups, which, when they are dead, have the rubber (silentblock) that acts as a buffer and shock absorber for the upper part of the suspension that no longer fulfils its role during small bumps that compress the suspensions. To check if this is the issue that worries you, take a dented road and listen to the noise coming from your front axle as you drive over holes. If it is indeed the cups, think of changing them fairly quickly or you may damage other parts and have to make more important repairs.
Check the cardan shaft
If you are here because you have searched for “Lexus IS suspension noise” and the suspension is not the cause of your problem, it may be that the cardan shaft is responsible. In fact, when the cardan bellows get out of date and the dirt/dust builds up inside them their working is deteriorated and it is possible to experience a noise when they are in torsion. To check this, you can try both types of torsion, first vertical with suspension compressions on the speed bump passages, and horizontal when you are going to make a turn at low speed. If it cracks in these two conditions you should consider replacing it or them. If you have the feeling that this noise is more like a a loud noise on Lexus IS, don’t hesitate to consult this content.
Check steering hinges/stabilizer bar
Finally, when you know a suspension noise when your Lexus IS passes over a speed bumps, it is possible that the hinges or the stabilizer bar are responsible. Exactly like the gimbals, the steering part is mobilized when you change direction. If this is the situation, the parts that may have been affected by normal wear and tear or impacts (e. g. sidewalks). The steering hinges, the stabilizer bar hinges. can be the origins of your noises, to check it, place it under the vehicle and apply twists on each of its elements to check that there is no special play on one of them, they are meant to endure you quite strongly over their entire travel. Please remember to take your vehicle to your auto mechanic or change them if they are involved.
squeaky noise speed bump Lexus IS
Check the stabilizer bar
If, alternatively, you have a noise that is more like a squeak when you go over a speed bump with your Lexus IS, it is possible that it is the stabilizer bar itself that is concerned. In fact, abnormal/pronounced wear of the latter can cause unusual friction which can generate this squeaking noise. Keep in mind to check by passing under your vehicle the condition of the paint on your bar which will reveal if there is friction. Second possible point, it may be your stabilizer bar silentblocks that are dried out and cause noise, in which case take them off from the cradle and grease them, this should solve the issue.
Check engine silentblocks
Finally, last case that we can check together, it is the engine silentblocks, actually, these silentblocks process as pads/shock absorbers between the engine and the cradle of the vehicle, a pronounced weakness of these will generate a subsidence and therefore a space between the engine and the silentblocks, it may happen that a squeaking noise shows up when you pass a speed bumps or any holes with your Lexus IS. To swap them go to your technician.
Other speed bump noise Lexus IS
If, despite all its assumptions, you still can’t find the origin of the noise your Lexus IS makes when you pass a speed bump, we suggest you to consult this content on a loud noise on Lexus IS or to visit your auto mechanic in order to carry an in-depth check on your Lexus IS and discover this issue.
