1978 Ford FiestaFACTORY OEM SERVICE PROCEDURE

Processor Assembly

Housed in an aluminum case, this assembly continuously samples the 7 sensor signals and converts them to a usable signal for the computer. It also performs ignition timing, Thermactor and EGR flow calculations, and sends the proper electrical signal to the ignition module, EGR and Thermactor air control solenoids to adjust the timing and flow rates as required.

Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

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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.

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