Diagnostic Aids
WARNING: This page is about a different car, the 2003 Pontiac Sunfire, 2003 Pontiac Grand Am, 2003 Oldsmobile Alero, and 2003 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.
Monitoring misfire current counters, or misfire graph, may help isolate fuel injector causing condition.
Operating vehicle over a wide temperature range may help isolate fuel injector causing condition.
Perform the fuel injector coil test within the conditions of the customer's concern. A fuel injector condition may only be apparent at a certain temperature, or under certain conditions.