Dashpot: Adjustments

1. Start the engine and warm up to normal operating temperature (cooling fan comes on).

Dashpot Diaphragm #6 Hose:

2. Disconnect the #6 vacuum hose from the dashpot diaphragm and check the engine speed.

ENGINE SPEED SHOULD BE:
Manual: 2500 ± 500 rpm
Automatic: 2500 ± 500 rpm

Bending TAB On The Dashpot Diaphragm:

3. If the engine speed is excessively high, adjust the engine speed by bending TAB.

Vacuum Check On The #6 Hose For The Dashpot Diaphragm:

4. If the engine speed does not change, connect a vacuum pump to the #6 vacuum hose and check vacuum. There should be vacuum.
-If there is no vacuum, check the #6 vacuum hose for proper connection, cracks, blockage or disconnected hose and replace the 3-way joint.
-If there is vacuum, replace the dashpot diaphragm and retest.
5. Reconnect the #6 vacuum hose and check the idle speed. Idle speed should be within specification.
6. If idle speed is not within spec., see "DIAGNOSIS BY SYMPTOM" under "Computers and Control Systems".