Power Balance Check

Fuel System Diagnosis (Power Balance Check):

Circuit Description

Refer to Diagrams/Electrical for an electrical diagram of this circuit. Electrical Diagrams

The Fuel Injector Balance Test compares the performance of each of the cylinder by using the PCM to shut off fuel injection. This measures the performance of each cylinder by the amount of RPM drop caused by that cylinder not producing a power stroke. If proper fuel delivery has been determined, then a cylinder that does not show good performance (RPM drop) indicates either an ignition or mechanical problem.

Test Description

Number(s) below refer to the step number(s) on the Diagnostic Table.

3. Idle quality should get worse when an injector is disabled. The engine should miss and the idle will become rough.