If battery is old no hold,alternator is not charging battery is death.
SOURCE: Where is the Alternator located in a 1997 Lexus LS 400 ?
in the frony under the hood on the passenber side at about the middle you will see it it have a belt that goes around it
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.
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SOURCE: hi i got a lexus LS 400 1998 and my starter die
the starter is located in the valley under the intake manifold. you must remove the intake to access the starter. its a pretty involved job. when reassembling take your time and make sure that every wire is plugged in and every vacum line is connected.
SOURCE: I have a 1990 Lexus LS 400 and...
I would inspect your wires at the starter. If you live up north then corrosion is bad, clean all wires going to starter. then clean wires to back of alternator. I seriously doubt that alternator is the problem, but if you remove it you can have it tested for free at most parts stores.
Testimonial: "Thank you! You was right, it was not the alternator, it was a 125 AMP that was blown."
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