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HOMESERVICE MANUALSFORD1985MUSTANG LX, 2D HATCHBACK, 5.0 FREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEM5.0L CFI TESTSTESTINGPREPARATION FOR TESTING
1985 Ford Mustang LX, 2D Hatchback, 5.0 F

Preparation For Testing

1985 Ford Mustang LX, 2D Hatchback, 5.0 FSECTION Preparation For Testing
NOTE: If vehicle is towed in or is suspected of having intermittent problems, DO NOT  turn the ignition key off. Diagnostic codes may be stored in the continuous testing memory.

Correct test results for this system are dependent on the correct operation of several related non-EEC components and systems. All non-EEC problems should be corrected before attempting to diagnose the EEC system.

Before hooking up any equipment to diagnose the EEC system, make the following checks:

  • Verify the condition of the air cleaner and air ducting.
  • Check all vacuum hoses for leaks, restrictions and proper routing.
  • Check the EEC system wiring harness electrical connections for corrosion, loose or detached connectors, wires or terminals, and proper routing.
  • Check the ECA, sensors and actuators for physical damage.
  • Perform all necessary safety precautions to prevent personal injury or vehicle damage.
  • Set parking brake and place shift lever in "P" for auto. trans., Neutral for man. trans. DO NOT  move shift lever during testing unless specifically directed to do so.
  • Turn off all lights and accessories, and make sure that vehicle doors are closed when making readings.
  • Check and correct coolant level.
  • Start engine and idle until upper radiator hose is hot and pressurized and throttle is off fast idle. Check for leaks around exhaust manifold, oxygen sensor and vacuum connections.
  • Turn ignition key OFF.

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When to See a Mechanic

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

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