Dashpot Control System

Warm engine to normal operating temperature. Ensure idle speed is within specification. See IDLE SPEED & MIXTURE in ADJUSTMENTS article.
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.
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.
To check throttle body Vacuum Transmitting Valve (VTV) operation, operate engine at 3500 RPM. Release throttle. Ensure engine returns to proper idle speed in a few seconds. Reconnect control cables at throttle body.

Fig 1: Adjusting Typical Dashpot