1985 Subaru Brat AutomaticFACTORY OEM SERVICE PROCEDURE

Air Suction Valves ASV With Cut-Off Valve: Notes

  1. Remove ASV from engine. Without applying vacuum to section "A", blow compressed air through section "B" to see if a small amount of air is discharged from section "C". See Figure .
    Fig 1: Testing ASV with Cut-Off Valve
    G40363
  2. If too much air is discharged from section "C", reed valve is damaged or stuck open. Replace reed valve. If air discharge from section "A", diaphragm is broken. Replace air control valve.
  3. Apply 16 in. Hg to section "A". Blow air through section "B" to see if air flows smoothly through section "C". If air does not flow smoothly, reed valve is stuck closed. Replace reed valve.
  4. Blow air through section "C" to see if air flows through section "B". If air flows, reed valve is stuck open. Replace reed valve.
  5. If ASV has to be disassembled, inspect control valve by applying vacuum to the inlet vacuum port to determine if the control valve diaphragm operates normally and holds vacuum.
  6. Inspect the gasket for damage and cracks. After washing reed valve with gasoline, inspect for waves, cracks, or dents in the reed valve seat. Check for a cracked or broken reed valve. Inspect stopper for rust. Replace parts as necessary.
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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.

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