Mazda 323 1988 Workshop Manual page 396

Engine speed (rpm)
5B"O5X-03
9
DISTRIBUTOR (TURBO) 5
SPARKADVANCECONTROL
Centrifugal,
1. Warm up the engine to operating temperature.
2. Check that the idle speed and ignition timing are
correct.
3. Disconnect the vacuum hose from the vacuum
control unit, and plug the hose.
4. While gradually increasing the engine speed, use
a timing light to check the timing advance.
Excess advance weak governor spring
(if the governor spring is
broken, the advance will
rise very high)
Insufficient advance governor weight or cam
malfunction
Vacuum
1. Warm up the engine to operating temperature.
2. Check that the idle speed and ignition timing are
correct.
3. Disconnect the vacuum hose from the vacuum
control unit, and plug the hose.
4. Connect a vacuum pump to the vacuum control
unit and check by using the timing light while ap
plying vacuum.
I I I I I
1
(3.94) (7.87)(11.81)(15.74)(19.70)
Vacuum mmHg (inHg
63G05X-3:
323
Revised lo/87
5-37