M.E. Posted May 4, 2023 Share Posted May 4, 2023 2011 GS350 w/ 176k miles. Bought it used 2 weeks ago. It drives beautifully except . . . . with the car in motion, starting at about 25mph on up to 80+ mph, a metal-to-metal grinding noise is heard in the cabin. With the car not moving, in Neutral, and revving the engine it does NOT manifest. With car in motion and slipping it into Neutral, the noise does NOT change. Varying speed (25-80+mph) does NOT change the pitch or loudness of the sound. A Lexus shouldn't be this noisy - it is my 3rd. The transmission fluid was just topped off. Wheel bearings? Maybe it is the Bridgestone tires about half-way through their life (but changing speed did NOT change the sound) ? Not putting on my traditional Michelins just yet. Any thoughts? Quote Link to comment Share on other sites More sharing options...
RX400h Posted May 4, 2023 Share Posted May 4, 2023 Typically, a bearing-related noise will increase in loudness as the vehicle is rounding a curve, either to the left or right. I guess this can happen while the vehicle is going straight, but it is less likely to do so. Any mechanic should be able to pinpoint whether a bearing is the culprit. Quote Link to comment Share on other sites More sharing options...
Bykfixer Posted May 4, 2023 Share Posted May 4, 2023 Is it a scraping sound? Rattling sound? Rattling would probably be a loose heat shield or similar somewhere along the exhaust pipe. Scraping sound should change pitch as the speed quickens. You say it does not. So it could be an exhaust hanger allowing the pipe to rub back and forth. My 'guess' is it's exhaust pipe related. Quote Link to comment Share on other sites More sharing options...
M.E. Posted May 4, 2023 Author Share Posted May 4, 2023 Thanks for the replies. I'll take up the exhaust hanger issue with my mechanic. 1 Quote Link to comment Share on other sites More sharing options...
RX400h Posted May 4, 2023 Share Posted May 4, 2023 8 hours ago, Bykfixer said: Is it a scraping sound? Rattling sound? Rattling would probably be a loose heat shield or similar somewhere along the exhaust pipe. Scraping sound should change pitch as the speed quickens. You say it does not. So it could be an exhaust hanger allowing the pipe to rub back and forth. My 'guess' is it's exhaust pipe related. Grinding noise 😉 Quote Link to comment Share on other sites More sharing options...
dcfish Posted May 5, 2023 Share Posted May 5, 2023 Is the sound front or back of cabin ? Left or right ? Have some one ride along for better description of said noise. 4 ears are better than 2.... Quote Link to comment Share on other sites More sharing options...
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