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98 ls400 engine whine! idler pully? alternator?

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Old 04-21-11, 02:22 PM   #1
GX470GT
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Default 98 ls400 engine whine! idler pully? alternator?

98 ls400 engine whines as if there is a supercharger on it. it whines in sync with the rpm's. stops whinning around 2500rpm. idler pully? alternator?

the sound is not very loud, but its there and its annoying!

i can't figure out what pully its coming from. Anyone experience this before?

car has 73k miles
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Old 04-21-11, 03:15 PM   #2
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Unfortunately, this is one of those search and replace scenarios.
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Old 04-21-11, 03:44 PM   #3
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thats what i thought. oh man.... i guess ill start with the idler!
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Old 04-22-11, 07:29 AM   #4
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While the drive belt is off, check the engine-driven fan for back and forth movement. May be the fan bearing bracket.
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Old 04-22-11, 08:33 AM   #5
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mine is doing a similar thing but mine is more of a squeek
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Old 04-22-11, 08:34 AM   #6
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Quote:
Originally Posted by GX470GT View Post
98 ls400 engine whines as if there is a supercharger on it. it whines in sync with the rpm's. stops whinning around 2500rpm. idler pully? alternator?

the sound is not very loud, but its there and its annoying!

i can't figure out what pully its coming from. Anyone experience this before?

car has 73k miles
It could be any pulley. you have to remove the belt and spin them individually. A possibility, albeit probably not, is a water leak that is going on to the belt. That would make a high pitched chirp and go faster as you rev the motor.
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Old 04-22-11, 08:34 AM   #7
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Quote:
Originally Posted by GX470GT View Post
98 ls400 engine whines as if there is a supercharger on it. it whines in sync with the rpm's. stops whinning around 2500rpm. idler pully? alternator?

the sound is not very loud, but its there and its annoying!

i can't figure out what pully its coming from. Anyone experience this before?

car has 73k miles
It could be any pulley. you have to remove the belt and spin them individually. A possibility, albeit probably not, is a water leak that is going on to the belt. That would make a high pitched chirp and go faster as you rev the motor. Also possible to be the water pump. When was it changed last?
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Old 04-22-11, 08:42 AM   #8
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I had the same thing happen on a non-Lexus vehicle and I thought it was a number of things including water pump, alternator, pulleys, power steering pump, etc. Turns out that it was the drive belt which had hardened due to heat and age. Was a cheap repair so I would try replacing that first. Those type of noises are difficult to isolate sometimes.
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Old 04-23-11, 08:30 AM   #9
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A whine could be related to your transmission mounting or the rear engine mount (as they call it)... happened with me too... have a look at it first as it could be as simple as that... I thought that it was my engine too but it was definitely the mounting...
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3000, 96, 98, accord, engin, engine, es350, idle, lexas, lexus, ls400, pulley, rpms, squeak, whine, whining

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