Question about 1998 Lexus Gs 400

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98 gs300 loud screeching noise that last for about 5-10 seconds

I have a 98 gs300 I have noticed that whenever I stop and may even sit for a moment a loud screeching noise that last for about 5-10 seconds and then I smell smoke. After awhile no noise and no smoke. What could this be?

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  • ddlexleo Feb 27, 2009

    I have the same problem

  • Anonymous Mar 09, 2009

    (knocking on wood) This has not happened again, but my ac was not on when it did happen.

  • Anonymous May 11, 2010

    Yes your a.c on?

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  • Lexus Master
  • 2,361 Answers

The only four rotating items under the hood are
engine
power steering pump
A/C compressor
and smog emission pump.
==== I would check the fluid level on the power steering first. Check for pink fluid leak on the ground,
==== Check the A/C system with the wheel turn to one side and APPLY ALL LOADS.
Example: high beam on,A/C max,radio on and deforster on.
This will give you system a stress test.
All eyes on the pully and locate to part that generate the loud screeching noise.
My bet is on the power steering pump.

Please post more info on the comment window.
I will follow up on it.

Posted on Aug 24, 2009

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Belt noise when i start the car and it is cold. Last for about 15 secs. It has a new timing belt.


no engine stated, and this varies by ,, engine.

the belts , if new , screech for only 2 reasons
1: loose (or oil soaked, watch a guy last weak oil it to stop this)sad.
2: or the accessory its driving is seized.

id bet the cogged, timing belt will never screech, its idler might.
did you inspect all parts as you asssembled the engine.
no engine stated, so be hard for the blind to answer with savvy,
accurate answers, no?

ACCESSORY belts are tension'ed, 3 ways. (3 classes of systems)
1; manual tension. means you sit it to spec.
2: auto tension'ers
3: some look like auto type and are not.... the book for your engine tells all this.

the cam belt as special tension'g steps, did you follow those.
we cant guess what you did wrong.
nor if you even followed all steps.
below is technician loosing the auto tensioner
if the tensioner feels weak or bad, it is.
my guess, (useless) is that the cam belt is ok
but you skipped the accessory belts tension steps.
if it didnt screech before.451adf4b-5c25-45c0-9005-5e285b255e75.jpg

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Well, when I have a screeching problem, I try to use Wagner Thermoquiet brake pads that have the shim built in, instead of standard ones.

They seem to stop more quietly than other brands.

The technicians that say that there is nothing wrong are probably just measuring the thickness of the brake discs, and the thickness of the brake pads, and maybe look at the surface of the brake discs for glazing, and don't want to replace parts unnecessarily.

So, I would ask them about this problem and see if they can install the Thermoquiet Wagner brake pads to rectify the problem.

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