'93 LS400 noise from engine compartment
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Joined: Jan 2014
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From: FL
'93 LS400 noise from engine compartment
'93 LS400 148,000 kms
Only after the car warms up after being on the road. When slowing down into quiet areas there is some noise coming from the front. There is no separate noise while steering. It coincides with the engine rev, it seems to increase in pitch when you accelerate a bit. It is also audible in park. It makes a sound similar to an electric motor.
Any ideas, thanks in advance,
Only after the car warms up after being on the road. When slowing down into quiet areas there is some noise coming from the front. There is no separate noise while steering. It coincides with the engine rev, it seems to increase in pitch when you accelerate a bit. It is also audible in park. It makes a sound similar to an electric motor.
Any ideas, thanks in advance,
Racer
Joined: Nov 2001
Posts: 1,383
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Unbelievably I just started having a similar issue in a 90 LS just at the cusp of crossing the 300K mark.
It sounds like there is a 2nd electric type motor under the hood & it has been coming & going but ran for a long time on my last outing today.
It does not at all sound like a fan clutch is going out & the rotating assembly of the 1UZ-FE sounds as stout as ever.
No clue what this could be?? Seems to be a tad harmonic in nature.
This seems to be something spun by the Accessory Belt that is starting to revolt.
Note: My Alternator is a couple months post replacement. Denso
It sounds like there is a 2nd electric type motor under the hood & it has been coming & going but ran for a long time on my last outing today.
It does not at all sound like a fan clutch is going out & the rotating assembly of the 1UZ-FE sounds as stout as ever.
No clue what this could be?? Seems to be a tad harmonic in nature.
This seems to be something spun by the Accessory Belt that is starting to revolt.
Note: My Alternator is a couple months post replacement. Denso
Last edited by damon; Oct 14, 2015 at 08:33 PM.
Intermediate
Joined: Sep 2015
Posts: 431
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From: CA
Is it like a 'whirring' sound that follows the revs? Mine does it after it warms up. '98 with 200k. I'm thinking it might be timing belt related, perhaps the water pump or one of the idlers. I'm actually due for a water pump / timing belt replacement.
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Driver School Candidate
Joined: Aug 2015
Posts: 17
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From: Hawaii
Very easy to take off belt on a 96, just put a 14mm wrench on tensioner pully and as you put turning pressure (CCW) the belt can basically slip off.
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