Hi I am new to this site please excuse me if I post it in wrong place
I have 2010 Lexus rx350 with 230km on I hear some very strange and loud noise from rear left for 10-15 seconds intermittently and back to normal sometimes all day drive normal I attached audio of the noise
I hope somebody will help
thanks

 

That's quite bad I recommend you don't drive the car until the problem is solved. Could be the driveshaft or axle or even a loose wheel.

 

thanks for reply

Tire is good, if it would be driveshaft or axle it should make noise all the time, but mine is only first drive in the morning at the speed around 35-40kph and it last for 10-15 seconds if I slow down noise would slow down like end of the sound clip

 

Welcome to CL and our group of owners of aging Lexus RX350s and 450hs.
Although you appear rather dismissive of the offered advice, (and I disagree with your anaylsis) I too listened to the audio and agree that it needs to be inspected by a repair shop as soon as possible. That sound may be intermittent now but may become constant soon, or just lead to a catastrophic failure while driving without any additional warning. Something could be sticking and then loosen up after movement, but still be creating more wear. It won't go away or get better. You asked for advice and that advice is get it inspected since you don't know what is causing it even if you want to disregard the offered possibilites.

In my opinion based on your description and the sound, it is a rotating noise apparently from the left rear during intial movement which indicates one or more of several things back there. This includes but is not limited to the wheel bearings, braking system, CV joints, differential, differential support, driveshaft U joints, support bearings for driveshaft, suspension arm, sway bar or broken sway bar link, or any related parts.

Reminds me of the time in college when traveling with a friend and we heard a rattling sound from the right front. He had just picked his car up from a shop and they apparently failed to completely tighten the wheel nuts on the right front. This was in the days of hubcaps, so as the studs broke off and started rattling around inside the hubcap it finally got loud enough for us to hear it. When we pulled over, just outside Barstow, California at 4 am, only 2 of the 5 wheel studs were intact! We slowly drove into town and hung out at McDonalds until a local shop opened up to fix it.

 

My guess is wheel bearing.
Get her into Canadian Tire and have them do the once over in the left rear area, I’m sure it will be obvious once it’s up on the lift.

 

thanks I have taken it to the shop but didn’t find anything wrong mechanic couldn’t replicate noise

 

thanks I will try Canadian tire

 

Twice in my life I’ve had to do a wheel bearing replacement, even after initial mechanical checks by the garage could not see any obvious issues, that is, there was no free play or unusual noises detected at the hub.
It wasn’t until I persisted and had hubs removed and bearings replaced did the issue present itself, the bearings were damaged.

in the case of my beloved 92 Previa 4wd, it made a really unusual wop wop wop sound, only once in while while at 50-70 kph.
Kinda reminds me of your recorded noise but not exactly.
Everyone assumes bad wheel bearings always have free play, not true.

 

I know this sounds rather odd but here it is……do you hear this when u fill your gas tank beyond where the pump shuts off automatically? When I squeeze extra gas into the tank, I will hear this knocking sound from the rear aspect of the vehicle for about 30 miles until the fact the gas tank runs down a bit.