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Check that throttle linkage moves freely at throttle body. Ensure no vacuum ports on throttle body are restricted. Procedure for checking vacuum supply at throttle body is not available from manufacturer.
Check that no clearance exists between throttle stop screw and throttle lever when throttle is fully closed. See Fig 1. If clearance exists between throttle stop screw and throttle lever with throttle fully closed, go to next step.
Loosen lock nut on throttle stop screw. See Fig 1. With clearance between throttle stop screw and throttle lever, hold throttle fully closed and tighten throttle stop screw until it just contacts throttle lever. Once throttle stop screw contacts the throttle lever, tighten throttle stop screw an additional 1/4 turn and then tighten lock nut. Ensure Throttle Position (TP) sensor operates properly after performing this procedure. See THROTTLE POSITION SENSOR under ENGINE SENSORS & SWITCHES.

Fig 1: Locating Throttle Stop Screw & Throttle Lever (Highlander)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Throttle Body: Highlander