Download Removal 1. Disconnect the battery ground cables. 2. WARNING: RED-STRIPED WIRE HARNESS CARRIES 115V DC. SEVERE ELECTRICAL SHOCK MAY BE RECEIVED. DO NOT PIERCE. CAUTION: Do not attempt to service the fuel injector. The fuel injector is serviced as an assembly. If the fuel injector is disassembled for any reason, the calibration of the fuel injector will be inaccurate. There are two different fuel injectors used in the 7.3L DI turbo diesel engine: a 49-state injector and the California injector (rate shaped injector). These two injectors must not be interchanged because the Powertrain Control Modules are calibrated to the specific injector. Before replacing any injectors, refer to the Vehicle Emission Control Information (VECI) decal for proper injector selection. Failure to do so can cause poor engine performance, high emissions levels or damage to engine. Remove the engine cover. 3. Remove the two (2) nuts retaining the air cleaner-outlet tube support bracket to the left valve cover.