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Manual Transmission

  1. Warm engine to normal operating temperature. Ensure idle speed is within specification. See IDLE SPEED & MIXTURE in ADJUSTMENTS - 3.4L article. Remove cap, filter and separator from dashpot located on throttle body. See Fig 1.
  2. Start engine. Maintain engine speed at 2500 RPM. Plug Vacuum Transmitting Valve (VTV) hole in dashpot with your finger. See Fig 2.
  3. Release throttle. Dashpot should be extended and dashpot setting RPM should be 1800-2200 RPM. If dashpot setting RPM is not within specification, rotate dashpot adjusting screw to obtain correct RPM. See Fig 3.
  4. Repeat step 3) and ensure proper adjustment is obtained. To check Vacuum Transmitting Valve (VTV) operation, operate engine at dashpot testing RPM for a few seconds. Release throttle. Ensure engine returns to proper idle speed in approximately one second.
  5. Install separator, filter and cap. Ensure filter is installed with the coarse surface facing outward (away from dashpot).
Fig 1: Dashpot & Component ID
G96C09959Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 2: Vacuum Transmitting Valve ID
G96E09960Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 3: Dashpot Adjusting Screw ID
G96G09961Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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