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Home >> Toyota >> 1995 >> Supra 2JZ-GE, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests - Non-Turbo >> Throttle Controls >> Dashpot Control System
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Dashpot Control System

  1. Warm engine to normal operating temperature. Ensure idle speed is correct. See IDLE SPEED & MIXTURE in the ADJUSTMENTS article.
  2. Disconnect control cables from throttle body. With engine idling, use screwdriver to push dashpot rod to fully extended position. Note engine speed with dashpot rod fully extended.
  3. Engine speed should be 1400-2200 RPM on A/T models or 2200-3000 RPM on M/T models. If engine speed is not within specification, rotate dashpot adjusting screw until proper RPM is obtained. See Fig 3. 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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