Adjustment Procedure
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2003 Lexus SC 430, 2003 Lexus RX 300, 2003 Lexus LX 470, 2003 Lexus LS 430, and 2003 Lexus IS 300. However, it is still accessible from the selected car via links, so may be relevant.
- Ensure preliminary inspection procedure is performed before performing adjustment procedure. Using vacuum pump, apply 15.7 Hg in. of vacuum to throttle opener.
- To adjust open side adjusting screw, loosen lock nut on open side adjusting screw. See Fig 1. Loosen open side adjusting screw to provide clearance between open side adjusting screw and throttle lever on No. 1 throttle body. Tighten open side adjusting screw until it just contacts throttle lever on No. 1 throttle body. DO NOT rotate open side adjusting screw after it just contacts throttle lever, or throttle lever on No. 1 throttle body will not contact throttle stop screw, and improper adjustment will exist. Loosen open side adjusting screw 1/4 turn and tighten lock nut.
- To adjust close side adjusting screw, loosen lock nut on close side adjusting screw. See Fig 1. Loosen close side adjusting screw to provide clearance between close side adjusting screw and throttle lever on No. 1 throttle body. Tighten close side adjusting screw until it just contacts throttle lever on No. 1 throttle body. DO NOT rotate close side adjusting screw after it just contacts throttle lever, or throttle lever on No. 2 throttle body will not contact throttle stop screw, and improper adjustment will exist. Loosen close side adjusting screw 1/2-3/4 turn and tighten lock nut.
- After open and close side adjusting screws are adjusted, perform preliminary inspection procedure again to ensure proper throttle body lever adjustment.