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Home >> Mercedes Benz >> 1974 >> 280 >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Exhaust Emissions System - Exhaust Gas RECIRCULATION >> Testing >> Exhaust Pressure Transducer >> 1977-79 Models
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1977-79 Models

Run engine at idle speed. Disconnect Brown vacuum line at EGR valve. Connect a vacuum gauge to vacuum line or close line with finger. Vacuum must be present at idle speed. If no vacuum is present, replace exhaust pressure transducer.