LS400BOY

i know theres topics about this but cant find none with this problem wondering if yall can help me,firt off its a 92 ls400, i know my power steering pump needs to be fixed but i know this noise is not comming from that at all cuz i just topped it off with oil, it started today when i was taking wife to work it was a loud whinning noise it goes in and out sometines and gets real loud and anoying at times? i parked the car stated it up and it wasent making no noise then i reved it up then it started to make the loud whinning, what is is?? i thought it was my water pump going out but never heard no whinning noise that loud from a bad water pump, could it be my belt? i kinda smelled a funny smell like it could be the belt but i may just be just asuming stuff? any help plese from you lexus guys thanks much

JimsGX

Don't rule out that the power steering pump is the source of the noise. Since you said you had to add fluid to it, if it got too low, it may be airbound / have air in the system. Does the power steering work without issue?

There's many a thread on here under the sticky that explains how to get air out of the system. It involves getting the front of the car up on jackstands, starting the car and turning the steering wheel lock to lock a good 25~30 times to purge any air out of the system.

Jim

LS400BOY

It seem to work fine when first noticed the loud whinning ima double check right now but it seemed good to me tho??

miles56

My 1992 ls400 been making a noise for awhile thought to be ps or water pump but last night it turn out to be idler pullly froze up ripped serpine belt.

benjanet

I'll share some advice that I just followed.

Remove your accessory drive belt. If the whine persists, check under the car: it could be your transmission pump starving for oil because you have a clogged transmission sump pickup screen. $30 to replace, plus about 2.5qts of Dextron III T-II equiv.

PureDrifter

iTrader: (10)

this is either wrong or miswritten.

dexron III/Mercon spec fluid is NOT toyota type-iv compatible. they are NOT interchangeable.

p.hase

i had the same on my 1992 SC400 - it sounds like the end of life of your alternator.

LS400BOY

well i just got done about a week ago plugging my acv and replacing my alt so now something else making a noise?? it gets louder as i pick up speed, i had got some belt dressing and put it on that didnt help at all, could this just be a sign of a worn belt????

LS400BOY

stupid question but does the tenstioner move to or the belt just slips off it??

deanshark

If it's not turning then there is your noise. (belt squealing as it drags across the pulley) I say try taking the belt off and spin all the pulleys (alt, PS, AC, tensoiner) and see if any are making noise.
Also, when you just changed your alt you might have put your belt back on the opposite way that it originally was and it's worn on one side, causing the noise.

LS400BOY

so the tentioner suppose to turn? why is it stuck then??

deanshark

If it's not turning then the bearing is siezed up. Time to get a new one. I'm not sure if the bearing can be changed or ya gotta get a new tensioner. If you keep driving like that the belt will just wear down and eventually snap.

PureDrifter

iTrader: (10)

you did make sure there's tension on the belt and it's not just loose....right?

LS400BOY

damn always somrthing huh!! so what they usally run for?? and is it easy to replace

LS400BOY

i really doubt its loose if so it slip off right? ill double check but last i seen when i put the belt on its tight