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Home >> Mercedes Benz >> 1986 >> 560SL >> Repair and Diagnosis >> Engine Performance >> System >> Fuel Evaporation System >> Testing >> System Check

System Check

  1. Disconnect hose between purge valve and canister at canister. Place finger over hose end. Slowly increase engine speed to 3000 RPM. No vacuum should be present at idle; vacuum should gradually increase with engine speed.
  2. If no vacuum was present at hose, trace hose back to throttle valve housing. Blow through connection on housing and ensure hose is clear.
  3. If vacuum is still not present, remove White/Purple/Black hose from purge valve. If vacuum is now present, replace purge valve. If vacuum is not present, replace thermo valve.
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