Question about 1991 Lexus LS 400

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1991 LS400 BOGS DOWN WHEN YOU ACCELERATE - 1991 Lexus LS 400

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Posted on Jan 02, 2017

co7196
  • 3433 Answers

SOURCE: ls400 1991, I replaced the throttle postioning

The MAF sesortells the puter how much fuel is needed for proper air fuel ratio. It is located in the duct coming from the air filter. the first sensor. Good luck.

Posted on Jun 03, 2009

masteria
  • 355 Answers

SOURCE: 1991 lexus ls400 doesn't accelerate

Clean, inspect and, or, Replace your crank sensor or, crank sensor wiring A loose crank sensor bracket or, a start relay has caused this before

Posted on Jun 15, 2009

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


It sounds like a fuel delivery issue so it could be many things such as low fuel pressure from the pump,clogged or partially pluged fuel filter, a malfunctioning throttle posisitioning sensor (if you have a check engine light on) or if its turbo it could be turbo lag etc.

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1991 lexus ls400 doesn't accelerate


Clean, inspect and, or, Replace your crank sensor or, crank sensor wiring A loose crank sensor bracket or, a start relay has caused this before

Jun 15, 2009 | 1991 Lexus LS 400

1 Answer

Ls400 1991, I replaced the throttle postioning sensor and it still idles and won't go when I accelerate.


The MAF sesortells the puter how much fuel is needed for proper air fuel ratio. It is located in the duct coming from the air filter. the first sensor. Good luck.

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