LS - 1st and 2nd Gen (1990-2000) Discussion topics related to the 1990 - 2000 Lexus LS400

'91 LS400 Hums under NO load

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Old 12-24-12, 02:07 PM
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jbh1957
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Default '91 LS400 Hums under NO load

My apologies if this has been answered. I found a ton of posts about drive-train vibrations and noises under load, but I have the opposite problem.

When I back off the accelerator at freeway speeds, I get a deep-pitched humming noise. Almost like wind noise through a door seal or an exhaust note. From the driver's seat it sounds like it's coming from the rear passenger-side door. From the passenger seat I'm told it sounds like it's coming from the left side of the car.

And it's just a hum. No vibrations or anything like that. And the pitch doesn't seem to change with speed.

Any suggestions?

Thanks in advance!
Old 12-24-12, 07:30 PM
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mikes7ke
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I read something before saying to change the two rear diff bushings, front side diff bushing, or even the four bushings between the rear subframe and chassis. I sort of lost interest. Hope this helps though. Good luck.
Old 12-26-12, 03:07 PM
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jbh1957
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Originally Posted by mikes7ke
I read something before saying to change the two rear diff bushings, front side diff bushing, or even the four bushings between the rear subframe and chassis. I sort of lost interest. Hope this helps though. Good luck.
Thanks for the quick response. I'll look into doing those.
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