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Tacoma & 4Runner

  1. Start engine and warm engine to normal operating temperature. Ensure idle speed is within specification. See IDLE SPEED & MIXTURE in ON-VEHICLE ADJUSTMENTS - 4-CYLINDER article.
  2. Shut engine off. Disconnect and plug vacuum hose at throttle opener. See Fig 1. Start engine and note engine speed. Engine speed should be 1200-1500 RPM.
  3. If engine speed is not within specification, replace throttle body. Shut engine off. Reinstall vacuum hose on throttle opener. Start engine and ensure engine returns to proper idle speed.
Fig 1: Locating Throttle Opener & Disconnecting Vacuum Hose (Tacoma & 4Runner)
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