Power Balance Test
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2016 Ford Transit-350 HD, 2016 Ford Transit-350, 2016 Ford Transit-250, 2016 Ford Transit-150, and 2016 Ford F-550 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.
The power balance test determines the relative power contribution of each engine cylinder. During the power stroke of each cylinder the test monitors the acceleration of the crankshaft. The crankshaft acceleration is recorded and displayed in firing order for all cylinders. This procedure may be used to assist in diagnosing a low contributing cylinder or injector concern.