Visual Inspection
NOTE:
All DFI diagnosis should begin with a thorough visual inspection. Visual inspection can often lead to the repair of a simple problem without the use of diagnostic charts.
Visual inspection should include:
- Checking vacuum hoses for damaged and proper routing.
- Checking for proper ground connections (ground eyelets connected to ground points). Ensure star washers are installed (if equipped). The engine/DFI fuel system grounds are located as follows: ECM and ALDL connector ground is located on body ground stud, near battery. Fuel pump ground is located in front of engine, near starter. The oxygen sensor reference circuit is grounded on engine, at rear bank of cylinders, with a ground eyelet on power steering line retainer clip.
- Checking for blown or missing fuses or relays, or installed in wrong locations.
- Checking air cleaner for proper installation. Heat tube and vacuum tap must be connected. PVC hose from rocker arm cover must be installed.