Fuel Injector Balance Test

Circuit Description
Refer to Injectors 1-4-6-7 wiring view and Injectors 2-3-5-8 wiring view for an electrical diagram of this circuit. The Power Balance Check 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.