Civic Wagon 4WD L4-1590cc 1.6L SOHC (D16A6) MFI (1989)
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.