1987 Subaru XT DLFACTORY OEM SERVICE PROCEDURE

Ignition System

The ignition system is composed of battery, ignition coil, distributor, spark plugs, knock sensor, MPFI control unit and spark plug wires. A crank angle sensor is built into distributor and detects crank position. Electronic signal is transmitted to control unit. The control unit calculates spark advance angle and determines spark timing signal. The spark timing signal, determined by the control unit, is transmitted to the power transistor where it makes the primary circuit to ignition coil. High voltage is then generated in the secondary circuit.

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.