1985 Porsche 928 AutomaticFACTORY OEM SERVICE PROCEDURE

EZF Control Unit

The ignition control unit is next to the LH control unit in the passenger's footwell. It has a vacuum connection which is connected with the intake air distributor. In this manner the ignition control unit receives instantaneous information on the engine load and can change the ignition timing accordingly.

A 25-pin plug is used to connect the ignition control unit with engine related ignition system components. The plug connection also has a coding tab, to prevent incorrect connection.

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.