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Home >> Mercedes Benz >> 1986 >> 300E Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Cis-E Fuel Injection System >> Component Testing >> Cold Start System >> Cold Start Valve

Cold Start Valve

  1. Unplug connector from cold start valve. Connect multimeter to cold start valve connector. Remove ignition distributor transmitter plug from switching unit (Green cable) or install Protective Plug (102 589 02 21 00 ) on diagnostic socket.
  2. Check voltage while cranking starter motor. Reading should be at least 10 volts. Disconnect fuel line on cold start valve. Remove cold start valve and reconnect fuel line. Hold cold start valve into container.
  3. Disconnect electrical plug at thermo time switch. Connect terminal "W" on plug to ground with jumper wire. Below 45°F (5°C), it is not necessary to ground thermo time switch connector. Start engine. Fuel coming from cold start valve should be in shape of cone. Disconnect ground if used.
  4. Dry any gasoline from nozzle of cold start valve. No drops should form. Remove jumper wire. Install cold start valve with new gasket. Reconnect wiring to cold start valve. Install relay and reconnect fuel line.
NOTE: During warm-up and at operating temperature, current to differential pressure regulator is determined by coolant temperature sensor, O2 sensor and ECU.
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