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Home >> Mercedes Benz >> 1979 >> 280CE >> Repair and Diagnosis (Single Page) >> Engine Performance >> Engine Control Systems >> Exhaust Emissions System - Exhaust Gas RECIRCULATION >> Testing >> EGR Control Valve >> 1977-78 230 Models
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1977-78 230 Models

Remove EGR valve. Connect Brown/Purple vacuum line to the removed valve. Run engine at idle speed, then slowly increase engine speed while covering openings in intake manifold. The EGR valve stem must lift off its seat. If not, replace EGR valve.

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