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Home >> Mazda >> 1977 >> GLC Base, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Exhaust Emissions System - Exhaust Gas RECIRCULATION >> Testing >> EGR Valve >> 1976-78 Models

1976-78 Models

Remove air cleaner. Start and run engine at idle. Disconnect vacuum sensing tube from EGR valve. Connect EGR valve directly to intake manifold vacuum source. When connection to EGR valve is made, engine should run rough or stall. If so, EGR valve is operating properly. If not, replace EGR valve.

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