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LS - 1st and 2nd Gen (1990-2000) Discussion topics related to the 1990 - 2000 Lexus LS400

throttle issues

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Old Oct 21, 2025 | 06:16 PM
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UCF20hunna's Avatar
UCF20hunna
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Default throttle issues

my car sat for a few months and now i got the new parts finally and well popped my hood and noticed my throttle position sensor was cut re wired with solder and i jumped the car and now it takes atleast 60% of the gas pedal being pressed until it acts like it revs up car hasnt ever done this and no CEL on i added a video of my issue thats what the file is

Last edited by UCF20hunna; Oct 21, 2025 at 06:17 PM.
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Old Oct 22, 2025 | 07:25 AM
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Year of car might be helpful to include.

At least for my 1995, there is a procedure in the FSM to calibrate the throttle position sensor / see if it’s within spec. It’s a mild hassle but all it requires is a multimeter, some feeler gauges and basic hand tools. Easiest done with throttle body off the car.
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Old Oct 22, 2025 | 11:17 AM
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my bad its a 1999 VVTI
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Old Oct 22, 2025 | 02:08 PM
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I believe procedure for 1998-2000 will be different from 1997 and prior so I cannot help directly but it should be covered in the factory service manual for your year. Perhaps someone who has tested / calibrated at TPS for 1998-2000 can comment directly.
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Old Oct 22, 2025 | 04:04 PM
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Here's the adjustment procedure.

https://www.clublexus.com/forums/ls-...-shifting.html

What parts did you have to replace? I'm assuming those parts were why the car sat for a few months? Make sure the battery is fully charged as well. Low charge can cause weird issues.

I don't see your video anywhere.
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Old Oct 23, 2025 | 02:12 PM
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UCF20hunna
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my bad and it was suspension parts that i have to replace and i did mess my break wear sensor so i have to re pin that but other then the UCAs i had to re wire the TPS bc it was cut
Attached Files
File Type: mov
IMG_4083.mov (16.05 MB, 5 views)
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