Very very light high frequency noise....
Thread Starter
Intermediate
Joined: Jul 2017
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From: Holland
Very very light high frequency noise....
Hello Lexus friends,
When I am cruising my LS430 I hear a very high frequent noise. When i,m off the throttle it disappears and when I touch the throttle again, it comes back.
Its really not loud and it reminds me of my old Mercedes. The differential started to fall apart after 60k miles and it started exactly the same but that sound got louder and louder and this sound seems to be the same after many miles.
And its mostly noticable from 60mph
Does anyone have a clue?
When I am cruising my LS430 I hear a very high frequent noise. When i,m off the throttle it disappears and when I touch the throttle again, it comes back.
Its really not loud and it reminds me of my old Mercedes. The differential started to fall apart after 60k miles and it started exactly the same but that sound got louder and louder and this sound seems to be the same after many miles.
And its mostly noticable from 60mph
Does anyone have a clue?
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Joined: Feb 2013
Posts: 2,498
Likes: 244
From: Milwaukee, Wi
Could be a number of different things... Drive shaft support, wheel bearing, differential, something in the Transmission...
Hard to say, really...
Heck, it could even be the fuel pump making noise under the rear seat..
Hard to say, really...
Heck, it could even be the fuel pump making noise under the rear seat..
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Joined: Dec 2017
Posts: 716
Likes: 168
From: FL
Hello Lexus friends,
When I am cruising my LS430 I hear a very high frequent noise. When i,m off the throttle it disappears and when I touch the throttle again, it comes back.
Its really not loud and it reminds me of my old Mercedes. The differential started to fall apart after 60k miles and it started exactly the same but that sound got louder and louder and this sound seems to be the same after many miles.
And its mostly noticable from 60mph
Does anyone have a clue?
When I am cruising my LS430 I hear a very high frequent noise. When i,m off the throttle it disappears and when I touch the throttle again, it comes back.
Its really not loud and it reminds me of my old Mercedes. The differential started to fall apart after 60k miles and it started exactly the same but that sound got louder and louder and this sound seems to be the same after many miles.
And its mostly noticable from 60mph
Does anyone have a clue?
Thread Starter
Intermediate
Joined: Jul 2017
Posts: 468
Likes: 32
From: Holland
Thanks for the reply guys!
The level of difficulty is the reason why I posted it here.
I have sound isolated all the trunk and back seats bottom + back + the doors with Silent Coat resonator + the Silent Coat foam etc. and I really believe this makes it a Bentley Killer (With the silence ofcourse)
Thats why I cant really believe that its the fuel pump but I never know for sure when I dont make a real diagnose. I should take out the back seat and make a testdrive with 2 people.
One more thing. Can It really be the pump when the sound its only noticeable from 60mh + and only when I toch the throttle? (or cruisecontrol)
The sound is btw continuously.
The level of difficulty is the reason why I posted it here.
I have sound isolated all the trunk and back seats bottom + back + the doors with Silent Coat resonator + the Silent Coat foam etc. and I really believe this makes it a Bentley Killer (With the silence ofcourse)
Thats why I cant really believe that its the fuel pump but I never know for sure when I dont make a real diagnose. I should take out the back seat and make a testdrive with 2 people.
One more thing. Can It really be the pump when the sound its only noticeable from 60mh + and only when I toch the throttle? (or cruisecontrol)
The sound is btw continuously.
Moderator
Joined: Feb 2013
Posts: 2,498
Likes: 244
From: Milwaukee, Wi
I guess I'd be most suspect of something in the driveline, more than anything.
What about removing the rear tires, and putting it in gear and running the car at 60 mph or so to see if you can hear anything while it's off the ground? There would be no load on the drivetrain, but it may yield a result??
Thread Starter
Intermediate
Joined: Jul 2017
Posts: 468
Likes: 32
From: Holland
The fuel pump would whine continuously, regardless of speed and engine load, so perhaps the fuel pump is not the most likely candidate.. Power steering pump is a good thought, but you're stating the noise is definitely coming from the rear of the car?
I guess I'd be most suspect of something in the driveline, more than anything.
What about removing the rear tires, and putting it in gear and running the car at 60 mph or so to see if you can hear anything while it's off the ground? There would be no load on the drivetrain, but it may yield a result??
I guess I'd be most suspect of something in the driveline, more than anything.
What about removing the rear tires, and putting it in gear and running the car at 60 mph or so to see if you can hear anything while it's off the ground? There would be no load on the drivetrain, but it may yield a result??
Maybe I should run my car on the dyno. I can always acces a nice 4x4 dyno for free but I have never putted my cars on it because i'm quite OCD on my cars....
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Joined: Feb 2013
Posts: 2,498
Likes: 244
From: Milwaukee, Wi
As far as running the car on Jack Stands with the rear tires removed? No risk at all. Really no different than jacking the car up with the engine shut off. There's no drive to the front wheels, so it really can't go anywhere. Put a couple of chocks in front of the front tires and you'd be golden...
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Joined: Dec 2017
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From: FL
The Dyno would be a better option, but they can be inherently noisy and you may not hear what you're trying to hear.
As far as running the car on Jack Stands with the rear tires removed? No risk at all. Really no different than jacking the car up with the engine shut off. There's no drive to the front wheels, so it really can't go anywhere. Put a couple of chocks in front of the front tires and you'd be golden...
As far as running the car on Jack Stands with the rear tires removed? No risk at all. Really no different than jacking the car up with the engine shut off. There's no drive to the front wheels, so it really can't go anywhere. Put a couple of chocks in front of the front tires and you'd be golden...
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Thread Starter
Intermediate
Joined: Jul 2017
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From: Holland
Ill try to make a test when I have the opportunity but it will take a wile. When I do ill keep it updated here.
If anybody has another suggestion, please let me know!
About testing on jackstands. It still makes me a bit scarred but Ill have to get over that and its a really simple test to do....
Ill do that when I change my differential fluid.
If anybody has another suggestion, please let me know!
About testing on jackstands. It still makes me a bit scarred but Ill have to get over that and its a really simple test to do....
Ill do that when I change my differential fluid.
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