Dashpot Control System

Warm engine to normal operating temperature. Ensure idle speed is within specification. See IDLE SPEED & MIXTURE in ADJUSTMENTS - NON-TURBO article.
Disconnect control cables from throttle body. Dashpot is located on throttle body, near throttle cables. See Fig 1. With engine idling, use screwdriver to push rod on dashpot to fully extended position. Note engine speed with rod fully extended.
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 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: Locating Dashpot, Rod & Dashpot Adjusting Screw