It starts for about 5 seconds and then stall and can't start again unless the IG switch was off and on again or the battery terminal was disconnected
SOURCE: Lexus won't stay running
Having same issue here. Try to change mass air flow sensor (bad news for you, it costs about $400)
SOURCE: My 1990 Lexus LS 400 stalls unexpedly (at any
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.
SOURCE: for my 1998 lexus ls 400. i attempted to jump
make sure all doors, hood and trunk are completely closed. put the key in the driver door lock and lock and onlock the door three times.
SOURCE: 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.
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The other trouble spot are
old accelerator cable
TPS Throttle position sensor
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I will do a simple tune up and gas treatment before starting to replace any parts.
Please post reply on the comment window.
SOURCE: what is the firing order for a 1992 Lexus LS 400?
Here is a diagram that should help you out.
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