Dashpot Control System
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 1990 Toyota Pickup, 1990 Toyota Cab & Chassis, 1990 Toyota 4Runner, 1989 Toyota Pickup, and 1989 Toyota Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
- Engine must be at normal operating temperature. Check idle speed and adjust, if necessary. Remove cap, filter and separator from dashpot. See Fig 1.
- Start engine. Maintain engine speed at specified testing RPM. See DASHPOT TESTING RPM table. Plug the Vacuum Transmitting Valve (VTV) hole with your finger. See Fig 1.
- Release throttle. Dashpot should be extended and dashpot setting RPM should be as specified. See DASHPOT TESTING RPM table. If idle speed is incorrect, adjust dashpot. See Fig 2.
- To check VTV operation, run engine at dashpot testing RPM for a few seconds. Plug the VTV hole with your finger. Release throttle. Uncover plugged hole. Engine should return to idle in about one second.
- Install dashpot separator, filter and cap. Install filter with coarser surface facing outward.
DASHPOT TESTING RPM
| Model | Testing RPM | (1) Dashpot Setting RPM | ||
|---|---|---|---|---|
| 22R-E | 2500 | 2000 | ||
| 3VZ-E | 2500 | 2000 | ||
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