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Faint whine when accelerating on 98 LS

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Old 09-15-18, 11:18 PM
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WaveRunner
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Default Faint whine when accelerating on 98 LS

I notice yesterday a faint whine almost like a low pressure turbo or supercharger from the front of my 98 LS400 with 143k miles when I accelerate. The car performs normally with no impact on performance. The AC is off. Anyone experience this? I have researched on this site and it seems like it could be a number of things including pulleys, cracked hoses, water pump (mine was changed 30k miles ago), transmission needing fluid replacement, among other things. I don't think it is a big deal unless it impacts something like mpg.
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Old 09-16-18, 11:00 PM
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Mine has it too wonder what it is. Gonna get the tranny flushed next weekend see if it was that.

Everything in your opinion was changed out recently. The runnin and water pump was fine 40k ago. Only thing left is the tranny fluid.

Last edited by Sin1UZFE; Yesterday at 08:18 AM.
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Old Yesterday, 12:18 PM
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Also on mine, the nose is only happening when moving forward. Nothing on idle when revving.
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Old Yesterday, 01:21 PM
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Don't want to alarm anyone, but a year ago right before my transmission started puking oil- I began to hear a howling high pitched sound. Shortly thereafter my transmission starting losing oil out of the bell housing.
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Old Yesterday, 01:27 PM
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Originally Posted by jaaa View Post
Don't want to alarm anyone, but a year ago right before my transmission started puking oil- I began to hear a howling high pitched sound. Shortly thereafter my transmission starting losing oil out of the bell housing.
..............
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Old Yesterday, 07:42 PM
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Originally Posted by WaveRunner View Post
I notice yesterday a faint whine almost like a low pressure turbo or supercharger from the front of my 98 LS400 with 143k miles when I accelerate. The car performs normally with no impact on performance. The AC is off. Anyone experience this? I have researched on this site and it seems like it could be a number of things including pulleys, cracked hoses, water pump (mine was changed 30k miles ago), transmission needing fluid replacement, among other things. I don't think it is a big deal unless it impacts something like mpg.
Driveshaft center bearing?
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Old Yesterday, 09:01 PM
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Originally Posted by jaaa View Post
Don't want to alarm anyone, but a year ago right before my transmission started puking oil- I began to hear a howling high pitched sound. Shortly thereafter my transmission starting losing oil out of the bell housing.
And what did you do to remedy the situation and for what model year/mileage? It is weird cause I don't really hear it anymore but I'm not sure if it is intermittent. I just got my oil changed and tires rotated at a Lexus dealer cause I had a coupon. The front wheel weights chafed the brake calipers causing this strange rotating sound which is not what was discussed in my original post. Had them sand it down. While looking over the suspension I was informed the right rear height sensor was torn/broken. Apparently it is for the HID headlamp auto leveler. They recommend changing the control arm it is attached to for ... wait for it ... $1698! Are they out of their minds? When the service advisor told me I just smiled at him and he knew damn right was I was thinking.

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Old Yesterday, 09:14 PM
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Originally Posted by WaveRunner View Post
And what did you do to remedy the situation and for what model year/mileage? It is weird cause I don't really hear it anymore but I'm not sure if it is intermittent. I just got my oil changed and tires rotated at a Lexus dealer cause I had a coupon. The front wheel weights chafed the brake calipers causing this strange rotating sound which is not what was discussed in my original post. Had them sand it down. While looking over the suspension I was informed the rear height sensor was torn/broken. Apparently it is for the HID headlamp auto leveler. They recommend changing the control arm it is attached to for ... wait for it ... $1698! Are they out of their minds? When the service advisor told me I just smiled at him and he knew damn right was I was thinking.
The remedy was a new transmission from a 1995 LS. For me it was a very strange sound- like air was being forced through a small opening. I had a 1996 LS that at that time was at 230k miles. More than likely you have some other problem. $1700 for a control arm sounds crazy.
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Old Yesterday, 10:59 PM
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Originally Posted by YODAONE View Post
Driveshaft center bearing?
Would that cause the same noise when reversing?
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Old Yesterday, 11:10 PM
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Originally Posted by jaaa View Post
The remedy was a new transmission from a 1995 LS. For me it was a very strange sound- like air was being forced through a small opening. I had a 1996 LS that at that time was at 230k miles. More than likely you have some other problem. $1700 for a control arm sounds crazy.

I'm hoping that just flushing the fluid will be rid of it. As we changed all hoses and checked the pulleys ( changed tensioner as it was broken and locked in place)
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Old Today, 01:18 AM
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Originally Posted by Sin1UZFE View Post
I'm hoping that just flushing the fluid will be rid of it. As we changed all hoses and checked the pulleys ( changed tensioner as it was broken and locked in place)
I hear so many different things about servicing the transmission. Some say don't flush. Others say just swap the fluid. Others say don't touch it period. I do notice mine occasionally has a less than smooth downshift when decelerating. It is weird cause I also have a Saab which has a Japanese-built 5-speed AISIN auto transmission (The LS has an AISIN transmission as well, the company is partly owned by Toyota) and it does the same thing every now and then. Saab service recommends you drain and refill (not flush) the fluid every 60k miles. On my LS, I'm just jumping the gun assuming the slight rough downshift means it needs new fluid or god forbid it is in early stages of slipping but I think that's just the way they are designed especially when you cruise then hit a patch of traffic or stop sign/light.

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Old Today, 06:31 AM
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Lots of stories here that removing 2 qts tranny fluid every 15,000 miles or so is a great service for these cars with excellent results.Use ONLY Toyota's Type IV or Mobil 3309,no to Maxlife,no to additives.This tranny wants only what Lexus says to use,the 2 I mentioned.Mobil makes the Toyota fluid.

That seems to be the advice given on this board.

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Old Today, 07:11 AM
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I figure To do it since I don't know the maintenance records for it except the timing belt, seals and water pump. Also, I can't find the tranny dipstick to check. A 99
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Old Today, 07:16 AM
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Originally Posted by Sin1UZFE View Post
I figure To do it since I don't know the maintenance records for it except the timing belt, seals and water pump. Also, I can't find the tranny dipstick to check. A 99
Get your records here for free

https://drivers.lexus.com/lexusdrivers/history
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Old Today, 07:40 AM
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Originally Posted by spuds View Post
Get your records here for free

https://drivers.lexus.com/lexusdrivers/history
I already tried it. Records end in 05.
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