Question about 1990 Lexus LS 400

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My lexus ls 400 has no power but it is running. What's the problem.

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  • Lexus Master
  • 14,036 Answers

Could have faulty spark plugs and wires,incorrect gapped spark plugs, clogged fuel injectors,clogged fuel filter,plugged air filter,could have low transmission fluid level or need transmission fluid changed, checked for restricted exhaust system, plugged muffler or catalytic converter will take away engine power.check the engine compression worn pistons rings and valves will cause power lost.you can hook vacuum gauge to intake manifold vacuum port,good steady engine vacuum will be 17 - 25 hgs. if engine vacuum gauge needle drops to 5 hgs more likely you have restricted exhaust system, either muffler plugged or catalytic converter could be plugged.

Posted on Feb 06, 2012

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  • Lexus Master
  • 75,822 Answers

The first thing to have checked is the fuel pressure, low pressure kills the power.

Posted on Feb 06, 2012

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Posted on Jan 02, 2017

  • 51 Answers

SOURCE: 1997 Lexus LS 400 Fuel Filter location

The fuel filter is located under the vehicle on the left side before the rear axle.

Posted on Oct 13, 2008

  • 1 Answer

SOURCE: 1994 lexus ls 400 problem with dash board light

Try rotating the ignition switch slightly after you turn it to on and see if the lights come on...had the same problem and changed the switch fixed the problem...

Posted on Feb 14, 2009

Mustgo
  • 2359 Answers

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.

====

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

  • 41 Answers

SOURCE: need to know what type of power steering fluid to add

almost a personal choice all fluids have to meet a certain standard

Posted on Apr 25, 2009

mkv0525
  • 358 Answers

SOURCE: 92 lexus ls 400 check engine and traction control light came on at the same time, 92 lexus ls 400.

the track off light will come everytime yhe check engine light comes on. this is normal. you need to have the check engine light checked first.you can go to your local parts house they will scan it for so you at least see what area you problem is in and then you can start from there. let me know lf you find out youe engine codes.

Posted on May 27, 2009

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1 Answer

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Toyota products usually don't use a shut-off for the fuel system.
If the fuel pressure is low, you would need to check the fuel pump relay for power and then the pump.

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