Distributor Advance Unit: Testing and Inspection

1986-87 CIVIC & CRX, 1986-88 ACCORD & 1988 PRELUDE W/CARBURETED ENGINE
1. Remove distributor cap and disconnect vacuum hoses at advance diaphragm.
2. Apply vacuum greater than 20 inches Hg to diaphragm top port and ensure stator turns counterclockwise and stays. If stator does not turn or stay, replace diaphragm.
3. Release vacuum and ensure stator returns. If stator does not return, replace diaphragm.
4. Using diaphragm bottom port, repeat steps 2 and 3.