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Home >> Mercedes Benz >> 1987 >> 300E >> Repair and Diagnosis >> Engine Performance >> System >> BOSCH Cis-E System >> Component Testing >> Cold Start System >> Cold Start Injector
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Cold Start Injector

  1. Disconnect cold start injector. Connect multimeter to cold start injector 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 injector. Remove injector 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 spray from cold start injector should be cone shaped. Disconnect ground test lead if used.
  4. Dry any gasoline from nozzle of cold start valve. No droplets should form. Remove jumper wire. Install injector with new gasket. Reconnect wiring. 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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