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Home >> Lexus >> 1998 >> SC 300 >> Repair and Diagnosis >> Engine Performance >> Engine Controls - Adjustments >> Throttle Opener

Throttle Opener

  1. On all except ES300, for testing and adjustment procedures, see THROTTLE CONTROLS in SYSTEM/COMPONENT TESTS article.
  2. On ES300, warm engine to normal operating temperature. Ensure idle speed is 650-750 RPM. Disconnect vacuum hose from throttle opener, and plug hose end. Run engine at 2500 RPM then release throttle. Throttle opener set speed should be 900-1950 RPM. If throttle opener set speed is not as specified, replace throttle body.
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