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Home >> Toyota >> 1993 >> Supra 2JZ-GE, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Emission Systems & Sub-Systems >> Throttle Controls >> Dashpot Control System (Turbo)
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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 throttle linkage. 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. See Fig 1. 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: Adjusting Dashpot
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