Engine Performance Diagnostic Procedures: Notes

2004 Ford Econoline E150, Van Cargo, 4.6 WSECTION Notes
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NOTE: Repair each problem detected before going on to the next step. If repair corrects the original complaint, it will not be necessary to proceed to the next step or diagnostic procedure. However, if complaint is not corrected, continue with the testing until complaint is corrected. Test procedures are written specifically for use with New Generation Star (NGS) tester. If a generic scan tool is used, ensure scan tool is certified OBD-II standard. A generic scan tool may not be capable of performing all necessary test functions.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.