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Home >> Subaru >> 1985 >> GL 4D Sedan, 1.8 5, Standard >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Spark Control System >> System Testing >> Anti-Afterburning System >> Vacuum Line
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Vacuum Line

Check vacuum line for leakage and looseness. To do so, disconnect vacuum hose from Anti-Afterburning Valve (AAV), then run the engine. Ensure that air is sucked into vacuum hose. If not, vacuum line is defective.

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