Dashpot: Testing and Inspection

Dashpot System Test





1. Check the vacuum line for leaks, blockage or a disconnected hose.





2. Disconnect # 6 vacuum hose from the dashpot diaphragm, and connect a vacuum pump/gauge to the hose.
3. Start the engine.
4. Raise engine speed to 3,500 rpm.

Vacuum should appear on gauge.

- If no vacuum, check that the vacuum port on the throttle body.
5. Release the throttle.

Vacuum should go out slowly.

- If the vacuum holds or goes out quickly, replace the dashpot check valve and re-test.





6. Connect a vacuum pump to the dashpot diaphragm.
7. Apply vacuum and check that the rod pulls in and vacuum holds.
The rod should pull in and vacuum should hold.
- If the vacuum does not hold or the rod does not move, replace the dashpot diaphragm and retest.