Dashpot Control System Test
- Engine must be at normal operating temperature. Check idle speed and adjust, if necessary. Remove cap, filter and separator from dashpot.
- Start engine. Maintain engine speed at specified testing RPM. See DASHPOT TESTING RPM table. Plug the Vacuum Transmitting Valve (VTV) hole with your finger.
- 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.
- 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
| Application | Testing RPM | (1) Dashpot Setting RPM | |||
|---|---|---|---|---|---|
| 2WD 4A-GE | 2500 | 1800 | |||
| 4WD 4A-FE | |||||
| Auto. Trans. | 3500 | 2200 | |||
| Man. Trans. | 3500 | 1800 | |||
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