This instruction manual provides operating guidelines and safety precautions for the Precision Duty Cycle Tach-Dwell Meter. It is designed to assist users in performing general guide tune-up tests on vehicles with 12-volt electrical systems and resistive ignition wires only.
The document details specific testing procedures, including measuring engine idle speed and mixture adjustment, checking air injection pump efficiency, and testing dwell angles for both conventional and electronic ignition systems. It also covers duty cycle testing for GM CCC systems and point resistance checks.
This instrument is designed to be used on vehicles with 12 volt electrical systems and resistive ignition wire only.
The tester's black grounding clip must be connected first, and it is disconnected last when testing is completed.
If the dwell reading changes 3-4 degrees or more while slowly increasing and decreasing engine speed.