Do you perceive a metallic noise on your smart forfour when ever you drive? We know that this is not pleasant and that you have questions. Hearing such a noise is not always a good sign, but it may also be nothing severe. To support you resolve this trouble, our redaction decided to compose this content to help you in this search. In order to execute this research as accurately as possible, we will first look into the conceivable origins of metallic noise in the front of your car, and then, if the metallic noise comes from the rear of your car.
Metal noise smart forfour coming from the front end of the car
I hear a metal rattling noise coming from wheels
- Metallic noise coming from your bearing
- Metalic noise coming from brake
- Stabilizer bar worn
One of the possible causes of metal noise symptoms on your smart forfour, may be that one of your bearing is tired, it will commonly produce a loud noise that increase when stressed (turns faster and faster). So think about to verify by taking speed (neutral gear and window open to pay attention only to noise of the wheels) that the noise is well established here, if this is the case swap it or them quickly. If, on the other hand, this noise only manifests itself with an engaged speed, examine this guide on loud noise on smart forfour, you will most likely find a solution to your trouble.
If you hear a metalic noise on smart forfour and you have the feeling that it comes from your front wheels, it is highly conceivable that it is your pads or discs that are the reason. Indeed, a disc or a set of dead plates will make a strong metallic friction noise that you will inevitably feel. To verify this, put your car on safety stand, and verify the condition of your discs and pads by taking away the wheel. If they are involved, swap them as soon as possible , otherwise you will no longer be able to brake. If you experience a metallic noise from your car, and you want informations about it, examine this guide for more details about brake noises on xxx.
If it is rather when you are turning, passing over a bump or sidewalk that you hear a metallic noise on your smart forfour, then your rods may be worn. Whether it is the steering or the stabilizer bar, their wear will cause a metallic snap when they hit or change direction. To verify this, position yourself under your car, without the wheels, and move your rods, if they only oppose very little force it is likely that they will have to be changed. If this is your case, we advise that you browse this content for a complete guide about steering noises on smart forfour.
Other sources
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- Engine silentblock
- Dead gearbox, or broken pinion
A bit like worn stabilizer bar, if your engine silent blocks are harmed, you will feel as you pass over damaged roads or sidewalks, loud metallic noises on your smart forfour. Once screwed up, they will no longer fulfill their purpose as shock absorbers and, with each impact, or violent acceleration, a noise will come out. Therefore, bear in mind to verify their status and swap them if necessary. Feel free to read this content which is a complete file about strut mounts noises on smart forfour, how to verify their condition and change them.
Finally, the last typical reason of metallic noise on smart forfour. It’s because your transmission system is the origin. It is conceivable, either because of improper use of the gearbox or because of excessive wear, that some gears in your gearbox have broken and are wandering around in it. They will then develop a continuous metal rattling sound. That you shouldn’t feel in neutral. If this is your case, we advise that you read this detailed guide on the sources of steering noises on smart forfour.
Metallic noise smart forfour coming from the rear end of the vehicle
Exhaust pipe
If, on the other hand, you feel an exhaust noise that is more of a metallic type, it is conceivable that one or more parts of your exhaust may be damaged. Indeed, it is conceivable that either the catalyst or the silencer may be the reason of this sound. To be certain, go under the car, cold, and knock each of the previously stated units with a hammer to identify the origin of the noise. You should hear things moving in the problematic part, if it’s the exhaust baffles, you can try to hammer in the section a little to try to block them and limit their movements. If it is a dead catalyst, it will be required to consider changing it, as well as the silencer. In this case, to stop the metallic noise on your smart forfour, you will either have to find a second hand one and do it yourself, or go to your mechanic.
Noise from wheels
- Bearings
- Brake pads or discs
As for the bearings of your car, it is conceivable that with wear they are at the origin of your metallic noises on your smart forfour. Go a little further up in the article where you will find information of the solution already exposed for the front part of the car.
Finally, if the noise originates from your discs brakes or pads, you should refer to the part in question in the first section of this manual.
