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Home >> Toyota >> 1997 >> Supra 3.0 D, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests - Non-Turbo >> Throttle Controls >> Throttle Opener
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Throttle Opener

  1. Warm engine to normal operating temperature. Ensure idle speed is within specification. See IDLE SPEED & MIXTURE in ADJUSTMENTS - NON-TURBO article.
  2. Disconnect and plug vacuum hose at throttle opener located on throttle body. See Fig 1. Start engine. Maintain engine speed at 2500 RPM. Release throttle and note engine speed. Engine speed should be 1100-1900 RPM.
  3. Replace throttle body if engine speed is not within specification. Reinstall vacuum hose on throttle opener. Start engine and ensure engine returns to proper idle speed.
Fig 1: Locating Throttle Opener & Components
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