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Dashpot Control System

  1. Warm engine to normal operating temperature. Ensure idle speed is correct. See IDLE SPEED & MIXTURE in ADJUSTMENTS article. Remove cap, filter and separator from dashpot. See Fig 1.
  2. Start engine. Maintain engine speed at specified testing RPM. See DASHPOT TESTING SPECIFICATIONS  table. Plug Vacuum Transmitting Valve (VTV) hole with your finger. See Fig 2.
  3. Release throttle. Dashpot should be extended and dashpot setting RPM should be as specified. See DASHPOT TESTING SPECIFICATIONS  table.
  4. If dashpot setting RPM is incorrect, rotate dashpot adjusting screw to obtain correct RPM. See Fig 3. Repeat steps 3) and 4) and ensure proper adjustment is obtained.
  5. Install separator, filter and cap. Install filter with the coarse surface facing outward (away from dashpot).
  6. To check VTV operation, operate engine at dashpot testing RPM for a few seconds. Release throttle. Ensure engine returns to idle in a few seconds.
Fig 1: Identifying Dashpot
G93D80542Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 2: Identifying Vacuum Transmitting Valve
G93F80544Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 3: Adjusting Dashpot
G93G80545Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
DASHPOT TESTING SPECIFICATIONS

Application Testing RPM (1) Dashpot Setting RPM
Tercel 2500 1500
(1) With electric cooling fan off (if equipped).
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