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Curtis McKinney Posted on Aug 14, 2015
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My Lexus ls 400 1994 stall upon acceleration but picks up speed shortly afterwards what my possible solutio

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Bill Boyd

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  • Lexus Master 53,816 Answers
  • Posted on Aug 14, 2015
Bill Boyd
Lexus Master
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Joined: Jan 04, 2013
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Run the fault codes and look for problems in the accelerator position sensor , throttle motor , MAP/VAF sensors.

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Engine light, no power

check out the wiring connections of the light.some thing must be getting short or cut somewhere.
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I have a ls400 1993.My car starts fine. But when I accelerate it moves very slow them picks up speed after a few minutes. repeats at every stop... Please help.

Throttle position sensor may be faulty. They do not always show fault codes.

There is a vehicle speed sensor too that may also be at fault. but the TPS is easier to get at initially.
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Hesitation when accelerating

By now, your car probably has on average over 100,000 miles. I good solid tune-up with spark plugs and wires my solve your problem. However, your fuel injection system my be to blame as well. Have a qualified mechanic trouble shoot your problem.
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1994 lexus ls 400 is not acclerating fast (driving slow) picks up speed slowly whats the problem?

There may be a problem in combustion unit. If the fuel supply to the combustion unit is not perfect, you will not get a sudden pick up. Try to fix these problems to get a better drive. If you want a higher pick up add superchargers or turbo as it induces oxygen for a better combustion. Have a glance at this link http://www.carpartswarehouse.com/part/turbo.html
2helpful
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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.


3helpful
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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?

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.
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1993 Lexus LS400 acceleration stalls or surges

I HAD THE SAME PROBLEM WITH MY CAR. 93 LS 400. THAT WOULD BE YOUR FUEL FILTER OR THE FUEL PUMP GOING BAD. TRY CHANGING THE FILTER FIRST. THE DEALER TRIED TO CHARGE ME $980 TO CHANGE FUEL PUMP.
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Stalls upon acceleration and back fires during engine speed.

check your fuel presher . mazda have a high fuel presher,
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