Poolmane

On 5/9/2022 at 2:53 PM, Spock66 said:

Brand new cars can have faults, if you discount this as a possibility without evidence you narrow down the possibility of finding the problem.

The car handles very good. Since I have the knock sound from beginning there is no fault with the handling. I have a safety training with the car and it was the "best" in the round of other cars. It handles very good.

On 5/9/2022 at 9:49 AM, PaulWhitt20 said:

Check the spare wheel gunk is fixed tightly to the top of the battery and the jack is in tight. mine was a bit loose and it seems better now.

Now just need to sort the squeak at low speeds. 

The spare wheel gunk i since 3 weeks on the right side of the trunk. That's not the fault.

I upgrade the Battery to 55ah 12v custom Battery so that there is no more space for the wheel gunk.

But thank you for your suggestions 🙂

4 hours ago, PaulWhitt20 said:

Check the spare wheel gunk is fixed tightly to the top of the battery and the jack is in tight. mine was a bit loose and it seems better now.

Now just need to sort the squeak at low speeds. 

Hey, as I said I have a hybrid and there is no spare wheel.

i I really can't imagine that something on the chassis/suspension is defective. I mean the vehicle has just run 47000km.

It's more a clean muffled knock noise when the suspension is working.

I didn't have a spare wheel it's a hybrid

Hi friends,

I have a IS300h F-Sport (from 2017, about 47000km on it) since last year. Sadly I have a thumping dumping sound from rear.

I'm trying to describe it: when I'm driving on a road that is slightly bumpy or not brand new, I hear a dull rumble from behind. Especially at slow speeds.

It is not a rattle or a metal sound. It is a clean dull muffled knock/bump. Everytime it's the same noise with the same volume.

A month ago I was at service and addressed this. They could hear it but they couldn't find anything and said it's normal. That drives me crazy! I looked through various forums in Germany but couldn't find any help .

The error occurs with both summer tires and winter tires. The vehicle is completely original.

Additionally i sound deaded the whole car, which makes it super quiet and comfy but the thump bump bump bump at lower speed destroys the experience.

I appreciate all your help and I tied to discribe the problem properly.

Sorry for my slight bad English 😄
Thanks a lot and best wishes from Germany

Timo