Actron Advance Timing Light CP7528 - Manual (Page 22)

DIGITAL TIMING LIGHT
1. At distributor, leave vacuum line disconnected and plugged. Connect
vacuum pump to distributor.
2. Increase engine speed to RPM specified by vehicle manufacturer.
Push and buttons until moving
mark is aligned with stationary “0” degree
mark. Note advance at specified RPM.
3. Use pump to apply vacuum specified by
manufacturer.
4. Push and buttons until moving
mark is aligned with stationary “0” degree
mark. Note degrees advance with vacuum applied.
5. Subtract degrees advance without vacuum from degrees with vacuum
applied. Difference is amount of vacuum advance.
6. Remove vacuum from distributor and return engine speed to idle.
NOTES
RPM XXXX
VACUUM XXXXX
ADV. RPM XX
VACUUM XX
ADVANCE WITH VACUUM
- ADVANCE WITHOUT VACUUM
Contribution of Vacuum
21