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Dashpot Control System: Turbo

  1. Warm engine to normal operating temperature. Ensure idle speed is correct. See IDLE SPEED & MIXTURE in ADJUSTMENTS article.
  2. Disconnect control cables from throttle body. With engine idling, rotate throttle linkage on throttle body until dashpot adjusting screw starts to separate from push rod on dashpot. Note engine speed at this position.
  3. Engine speed should be 1900-2700 RPM. If engine speed is not as specified, rotate dashpot adjusting screw until specified engine speed is obtained. Reconnect control cables to throttle body.
  4. To check throttle body Vacuum Transmitting Valve (VTV) operation, operate engine at 3500 RPM. Release throttle. Ensure engine returns to idle in a few seconds.
Fig 1: Identifying Dashpot & Components
G94I46035Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 2: Identifying Typical Vacuum Transmitting Valve
G93F80544Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 3: Adjusting Typical Dashpot
G93G80545Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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