How do i set the timming on 94 mercury villager van

You only set base timing to 15 degrees BTDC (before top dead center).

Ignition Timing

1. CAUTION: Parking brake control should be applied.
   Depress the parking brake pedal, and warm the engine to the normal operating temperature.

1. Turn off all electrical loads.

1. Rev the engine to 2000-3000 rpm two or three times and allow the engine to return to the idle.

1. Turn off the engine and disconnect the throttle position sensor electrical connector. (not really necessary)

1. Start the engine and rev it to 2000-3000 rpm two or three times and allow the engine to return to the idle.

1. Check the idle speed. The idle speed should be between 700-800 rpm in PARK (P) or NEUTRAL (N) position.

1. NOTE: Make sure that the timing pointer is pointing to the 15° Before Top Dead Center (BTDC) mark on the crankshaft pulley. Each notch on the crankshaft pulley represents 5 degrees.
   Check the ignition timing with a timing light.
go here for villager help

http://autos.groups.yahoo.com/group/villagerquest/