1987 Subaru XT GL, AutomaticFACTORY OEM SERVICE PROCEDURE

Engine Performance: System: Turbocharger: Description

The turbocharging system is designed to be effective at low engine speed with larger torque for enhancing both fuel efficiency and power output. To prevent knocking and heavier thermal loads on the engine, the turbocharger has been equipped with a wastegate which diverts exhaust gases to reduce maximum boost pressure.

An additional safety device, the air relief valve, is mounted on the intake manifold. This device will discharge excessive boost pressure to atmosphere if wastegate fails.

Fig 1: Subaru Turbocharging System
G34715Courtesy of SUBARU OF AMERICA, INC.
Factory Service Tools

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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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