Question about 1992 Lexus Ls 400
I replaced the and tested the fuel pump, new fuel filter. no gas is getting to the engine. the engine turns over but will not start
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.
Posted on Oct 27, 2009
SOURCE: My 1993 Ls 400 Lexus runs fine for about 10 to 15 miles, then shuts off. it will not start for at least 2 or more hours. then it runs again. So far I've replace the fuel pump and fuel pump control
Need to check next time it quits,pull a wire and see if it has spark,
I suspect it is a ignition problem,not fuel.
Posted on Mar 24, 2012
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