I have a 98 Lexus ls400 had issue on engine - 1998 Lexus LS 400

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

It should fit. The issue is the engine wiring harness reference: 1uz-fe(1996) and 1uz-fe vvti (1999). and some engine accessories relocation. GL

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 ).

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

I have a 1999 LS400 an the VSC light was continually coming and finally I disconnected the battery over night and that reset it and haven't had anymore problems.

hello skeen... you will need Metric socket wrench set, Screwdrivers,, Pliers and Open-end metric wrenches. If you would like to review all of the steps involved, go to the link below. Joe
Thanks for choosing Fixya!

How to Replace the Starter on a Lexus Ls400 ' eHow.com http://www.ehow.com/how_4828284_replace-starter-lexus-ls.html#ixzz1JAiysdUX

I had the same problem with my 1992 LS400. My Lexus mechanic fixed it by replacing the MAF(Mass Air Flow).

This used to drive me crazy when the weather was hot.

the starter is located in middle of engine , to acces remove air intake chamber , its a big job

there located on top of engine under the cover thats says V8 FOUR CAM 32, 4 S.P. on each side,remove both covers and its easy access after that.

sounds like an engine immobilizer problem. close all doors,hood & trunk completely. lock and unlock the car three times with remote, then put key in door lock and lock & unlock three times.
did you accidently try to start with wrong key?