Accord L4-1955cc 2.0L SOHC FI (1987)
Vacuum Advance Diaphragm: Testing and Inspection
Advance Diaphragm Inspection
1. Remove the distributor cap and vacuum hoses (# 12, # 15 for Fuel-Injected Engine or # 2, # 25 for Carbureted Engine) from the advance
diaphragm.
2. Connect a vacuum pump/gauge to advance diaphragm A (inside port).
3. When vacuum (more than 500 mHg, 20 in. Hg is applied to the diaphragm, the stator should turn counterclockwise and stay.
If the stator does not turn or stay, replace the diaphragm.
When vacuum is released, the stator should return.
If the stator does not return, repair or replace as necessary.
4. Repeat step 1 - 3 for advance diaphragm B (outside port.)