LEMON Manuals: Even more car manuals for everyone
Home >> GMC >> 1997 >> C3500 HD 7.4 J, Automatic >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 5 (Engine Controls - System & Component Testing - 6.5L) >> Fuel System >> Injectors >> Spray Pattern Test

Spray Pattern Test

WARNING: This page is about a different variant/trim than selected.

The injector nozzles used with this system have several features that make pattern testing difficult. These features include longer nozzle overlap, greater pintle-to-body clearances and an internal wave washer between injector nozzle nut and injector. Typical injector nozzle tester cannot deliver fuel with sufficient velocity to obtain proper spray patterns. DO NOT  replace injector nozzle(s) based on spray pattern.