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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 (Non-Turbo)
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Dashpot Control System (Non-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, 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 Figure. 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.
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