Diagnostic Aids

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2003 GMC Sonoma, 2003 GMC Safari, 2003 GMC Jimmy, 2003 Chevrolet S10 Pickup, and 2003 Chevrolet Blazer. However, it is still accessible from the selected car via links, so may be relevant.

Monitoring fuel injector circuit status with scan tool, while moving fuel injector harness, may help isolate an intermittent condition.
Performing Fuel Injector Coil test may help isolate an intermittent condition. See FUEL INJECTOR COIL TEST .
For an intermittent condition, go to INTERMITTENTS in TROUBLE SHOOTING - NO CODES - 4.3L ASTRO, BLAZER, JIMMY CANADIAN, SAFARI, SONOMA & S10 PICKUP article.