Question about 1993 Lexus Ls 400

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1993 Lexus Ls400 loss of power a 2500-3000rpm when you accelerate hard on the gas pedel, hower if you press down on the gas pedal slowly the power will increase all the way up to 6000rps with no power lost. The power is only lost when you press on the gas pedal fast all the way to the floor of if you try to accelerate full power from a dead stop

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  • crazie_brit May 17, 2011

    i did the spark plugs and wires the injectors i have run cleaners throw it lot of them evere othere fill up but i guess i open then up clean my self cant trust them cleans to much thanks

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The mass air flow meter seams to be your problem, hope you checked the intake hose for rips or cracks, does the vehicle smell rich fuel at the tail pipe or you hear any whistle noise as you accelerate, may be a clogged catalytic convertor, if you unplug the mass air flow meter and the vehicle runs the same way this is your problem, if runs worst look else were.

Posted on May 09, 2014

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Sounds like your fuel filter is getting clogged up. Get that changed and it will be fixed. Should be an easy, cheap fix. Hope this helps, James Booth :))

Posted on May 17, 2011

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  • crazie_brit May 17, 2011

    i have change fuel filter ,o2 senors, tps, and fuel pump can it be the ecu ?

  • James Booth
    James Booth May 17, 2011

    Try your spark plugs and wires first. That will be WAYYY cheaper. And also check your fuel injectors to see if they are dirty and clogged.

  • Michael Sciarra
    Michael Sciarra May 09, 2014

    okay lexus. you changed the spark plugs on this car, was the car doing this before the spark plugs or fuel filter was changed ? stop changing parts. stop, at this point it would have been cheaper to pay a profesional mechanic. you are trowing money at it to see if it sticks to it, is not the fuel filter ovius, as the car accelarates fine when given gas slowlly, it wasn't the spark plugs for the same reason, on acceleration respond no many things there, fuel pump, it is okay, mass air flow meter or intake hose, so inspect the intake hose to air filter for any cracks or rips, make sure the clamps are there, then check the mass air flow meter, if you unplug the air flow meter and test drive the car does it do the same thing, does the car accelarate the same way slow or does it die out, when pluged do you feel the engine smooth it self or is the same. also try with a screw driver handle hiting the mas air flow meter, litelly, if it stall out. change it,

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Molson02536
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SOURCE: 1993 Lexus Ls400 loss of power at 2500-3000rpm

Check your MAF and MAP sensor. The first 80% of your throttle signal from the TPS works with the O2 sensor to try to keep the air fuel ratio to 14.7 to 1 with the ECM controlling the fuel injector spray time and timing the ignition. After the 80% to WOT the ECM puts the O2 sensor in to an open loop and takes the Reading form the MAF and MAP sensor to run the engine richer so there will not be any Detonation to the engine and burning holes in the valves for running too lean. That is why it always feel like you get a little more when you ease off on the gas peddle from WOT. Recap check the TPS, MAF,and MAP sensor and wires to those sensors, if you can get the car scanned that would be great and you may find out which sensor may have gone bad, the other thing to is the fuel pressure regulator may be going bad and at WOT the pressure may be to high causing it to run to rich causing the loss of power. Good luck and hope this helps. 

Posted on Jul 04, 2009

  • 1 Answer

SOURCE: 1993 Lexus Ls400 loss of power a 2500-3000rpm

Wish I had an answer - sounds very much like a problem I am having with my '92 LS400. I have a parts car, and have changed out the ECM, fuel pump, injectors, fuel pilter, fuel pressure regulator, ran the can with exhaust unbolted (check for clogged CATs, checked out my timing belt for slippage amoung other things, and nothing works. I have no check engine light on. Do you?


Posted on Jul 06, 2010

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1993 Lexus Ls400 loss of power a 2500-3000rpm when you accelerate hard on the gas pedel, hower if you press down on the gas pedal slowly the power will increase all the way up to 6000rps with no power...


Wish I had an answer - sounds very much like a problem I am having with my '92 LS400. I have a parts car, and have changed out the ECM, fuel pump, injectors, fuel pilter, fuel pressure regulator, ran the can with exhaust unbolted (check for clogged CATs, checked out my timing belt for slippage amoung other things, and nothing works. I have no check engine light on. Do you?


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Check your MAF and MAP sensor. The first 80% of your throttle signal from the TPS works with the O2 sensor to try to keep the air fuel ratio to 14.7 to 1 with the ECM controlling the fuel injector spray time and timing the ignition. After the 80% to WOT the ECM puts the O2 sensor in to an open loop and takes the Reading form the MAF and MAP sensor to run the engine richer so there will not be any Detonation to the engine and burning holes in the valves for running too lean. That is why it always feel like you get a little more when you ease off on the gas peddle from WOT. Recap check the TPS, MAF,and MAP sensor and wires to those sensors, if you can get the car scanned that would be great and you may find out which sensor may have gone bad, the other thing to is the fuel pressure regulator may be going bad and at WOT the pressure may be to high causing it to run to rich causing the loss of power. Good luck and hope this helps. 

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