Loss of power on a lexus ls400 - 1992 Lexus Ls 400

Believe it is fuse no. 17 but go to bing.com and type in 1997 lexus Ls400 fuse panel. There are many diagrams there and you should be familiar with what your panel looks like.

best ask a steering specialist shop as the engine identification shows a es300 as a 1mz-fe (3.0 ltr) and a ls400 as a 1uz-fe (4.0 ltr)
there may be mounting differences between the engines

1995 Lexus LS400 specifications, information, data, photos ...

www.carfolio.com/specifications/models/car/?car=23507
1995 Lexus LS400 automobile specifications & information. ... The Lexus LS400's engine is a naturally aspirated petrol, 4 litre, double overhead ... 4 valves per cylinder... bmep (brake mean effective pressure), 1171.5 kPa (169.9 psi ).

Wish I had an answer - sounds very much like a problem I am having with my '92 LS400. I have a parts car, and have changed out the ECM, fuel pump, injectors, fuel pilter, fuel pressure regulator, ran the can with exhaust unbolted (check for clogged CATs, checked out my timing belt for slippage amoung other things, and nothing works. I have no check engine light on. Do you?

As mentioned check ps fluid. If it wines when turning and still no power then the pump is internally bad.. If the fluid is dissapearing fast then its a hose or most likely a leaking rack& pinion assembly..

check the computer known for going bad. auto computer exchange in Davie fL can fix it

Check your MAF and MAP sensor. The first 80% of your throttle signal from the TPS works with the O2 sensor to try to keep the air fuel ratio to 14.7 to 1 with the ECM controlling the fuel injector spray time and timing the ignition. After the 80% to WOT the ECM puts the O2 sensor in to an open loop and takes the Reading form the MAF and MAP sensor to run the engine richer so there will not be any Detonation to the engine and burning holes in the valves for running too lean. That is why it always feel like you get a little more when you ease off on the gas peddle from WOT. Recap check the TPS, MAF,and MAP sensor and wires to those sensors, if you can get the car scanned that would be great and you may find out which sensor may have gone bad, the other thing to is the fuel pressure regulator may be going bad and at WOT the pressure may be to high causing it to run to rich causing the loss of power. Good luck and hope this helps. 

1993 Lexus LS400 wont idle but will run

You just go to the link I attached I'm sure you will get the solution of your problem 1991 LS400