Question about 1990 Lexus LS 400

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My 1990 Lexus LS 400 stalls unexpedly (at any speed).When put in neutral, it starts up and runs fine for a few minutes then stalls again. Why?

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Your fuel pump or fuel pressure regulator are not supplying constant fuel pressure. Too much or too little is causing it to kill. You can pull the vacuum line from the regulaor and check for gas. If there is none, you need a pump, it is weak.

Posted on Sep 17, 2009

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I have a 1990 Lexus ls 400, I had an issue with the alternator. I changed it, and now the car will die with out warning. Sometimes it will drive for several miles, other times it will turn over and shut right back off. I have had the computer diagnose done and it doesn't pull any codes... checked the ignitors, the crank censors, and the cam censors... dont know what else to try

Posted on May 13, 2014

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Computer, have it checked out. they are known for going bad.

Posted on Oct 02, 2009

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My lexus ls 400 will run for 30 minutes then stall and it will take at least 30 minutes for it to start


check engine temperature could be overheating or you have faulty throttle control motor.could have faulty mass air flow sensor.have vechicle code scan before buying new parts.

Oct 08, 2012 | 1990 Lexus LS 400

1 Answer

I have a lexus LS 400 (1995) model. What I don't


It is a bad (leaky) electrolytic capacitor in the dash board that cost a few dollars. The dealer wants to install a whole new dashboard assembly for big $$$.

Apr 20, 2010 | 1992 Lexus Ls 400

1 Answer

1990 lexus ls 400 security system went off now vehicle will not start. keys open door, turn alarm off but starter will not engage. had problem 2 months ago changed car battery. vehicle started, but the...


Okay you may want to check to see if the sensor on door lock cylinder hasn't fallen off from the lock itself. Pull of the door panels and check the wires at the door lock cylinder. Hope this helps.

Mar 25, 2010 | 1990 Lexus LS 400

1 Answer

My 1992 lexus ls 400 keeps stalling and idleis very low


Look for a small electric motor near the accelerator cable and near the top of the valve cover.

It's call IDLE AIR CONTROL (IAC) motor.

It's job is to increase the idle when load is added.
Example: turning on headlight,turning on AC.

Testing it is simple.

Warm up you car for 10 minutes.

Locate the IAC motor

turn on loads.....AC,headlights,etc


The motor should move the idle up


If the motor does not increase the RPM then it can be stick.

Try to give it few gentle taps to free up the gears.

It can be clean if your are up to it.


This electrical motor is very expensive. Please handle it with care.

====

The other trouble spot are

old accelerator cable

TPS Throttle position sensor

====

I will do a simple tune up and gas treatment before starting to replace any parts.


Please post reply on the comment window.


Oct 27, 2009 | 1992 Lexus Ls 400

1 Answer

Brakes locking up Intermittent problem


your abs system is malfunctioning. i would suggest that you take the car to a dealership asap

Apr 12, 2009 | 1990 Lexus LS 400

3 Answers

Will not start


Hi again,

Any developments with your Lexus?

Jun 18, 2008 | 1990 Lexus LS 400

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