Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSSUBARU1985GL 4D SEDAN, 1.8 5, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMSPARK CONTROL SYSTEMSYSTEM TESTINGANTI-AFTERBURNING SYSTEMANTI-AFTERBURNING VALVE (AAV)
1985 Subaru GL 4D Sedan, 1.8 5, Standard
Anti-Afterburning Valve (AAV)
1985 Subaru GL 4D Sedan, 1.8 5, StandardSECTION Anti-Afterburning Valve (AAV)
Hold a piece of paper under the AAV, run engine to 3000 RPM and close the throttle quickly. If paper is sucked to the AAV at this moment, the AAV is operating normally. If not, the AAV is defective. Replacement is necessary.
RENDER: 1.0x
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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.