Test Description

WARNING: This page is about a different car, the 2003 GMC Sierra and 2003 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The number below refers to step number in diagnostic procedure.

3 - Engine Coolant Temperature (ECT) must be below operating temperature in order to avoid irregular fuel pressure readings due to hot soak fuel boiling.

Fig 1: Injector Balance Test Example

Courtesy of GENERAL MOTORS CORP.