Where does the main belt on for a ls400 - 1991 Lexus LS 400

Your timing belt may have stretched and jump timing,take cover off to inspect belt,here's a link on how to do. How to Change the Timing Belt Water Pump1990 1994 Lexus LS400

check belt for damage or wear ---check all pulleys a bearing maybe bad and causing a wobble or not turning --check the tension pulley if no tention belt will be to loose

first look at belt if loose worn cracked glazed or just plain old and worn out change because a bad belt makes noise when slipping on pulleys ------if belt is good than look at belt tensioner ---- and pulleys to all components ---and listen to the area when vehicle running for grinding or squeal

You have to have adequate fuel pressure to start your motor and for your motor to keep started and run efficiently I would check your fuel pump I had a 2000 Lexus LS400 I had to replace the fuel pump

if the belt is nice and tight and is spinning around the pulley and fluids are full, then your steering pump is going bad

timing belt not broke but the teeth and come away from the belt ,its the belt 99% sure of it

How to set the timing on a Lexus LS400 when changing the timing belt

Yes it runs the water pump,the car will over heat almost as soon as the belt breaks wile driveing down the road.Thanks for using Fixya.....Ray

take the cover off and then ask assistant to turn engine over whilst you check the belt

Here is a website, that offers a tutorial, with step by step pictures on how to do this job. I have replaced two timing belts and this tutorial really helped me.

www.lexls.com/tutorials/engine/timingbelt.html

PS if you have any other questions, feel free to email me back. I have worked on several LS400's