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Home >> Mercedes Benz >> 1978 >> 280CE >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Exhaust Emissions System - EVAP >> Testing >> Purge Valve
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Purge Valve

  1. On 230 models, disconnect middle purge hose to carburetor at canister. On all other models disconnect black plastic hose at canister. On all models, start and run engine at idle, with finger on end of hose. No vacuum should be felt.
  2. Increase engine speed to 2000 RPM. Vacuum should increase as speed increases. If there is no vacuum, check all canister hose connections and hoses for damage. Disconnect purge hose at throttle housing and repeat check. If vacuum is felt here, replace purge valve.
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