l990 Ls400 throttle problems - ClubLexus - Lexus Forum Discussion

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l990 Ls400 throttle problems

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Old 12-26-13, 04:41 PM
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90Ls4004JG
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Default l990 Ls400 throttle problems

Hi, first of all I'd like to thank you for taking the time to read my post. Well I recently purchased a 1990 Lexus and just a couple weeks ago the throttle uncontrollably accelerated now I can't even leave it in park otherwise the rpm's shoot up to 6-7000 RPM's. What would Cause this and how can I fix it? Thank You for your time!
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Old 12-26-13, 07:11 PM
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LScowboyLS
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this could be several things:

● throttle pedal (make sure it is snapping back and not getting hung up in floor mat) - it should return to original position when pushed and then let go with your hand
● throttle cable
● ECU
● throttle position sensor
● another sensor feeding the ECU incorrect information

please download the codes as shown here - car does not need to be running to do this

Last edited by LScowboyLS; 12-27-13 at 09:01 PM.
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Old 12-27-13, 07:09 PM
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YoshiMan
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It's likely something binding in the Throttle cable, or on the throttle itself. Have you checked under the hood to make certain everything is operating correctly? I bet the throttle is stuck wide open if not!
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