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Home >> BMW >> 1982 >> 528e Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> BMW MOTRONIC Emission Control System >> Testing >> Test 4: Cold Start Valve >> Valve Does Not Open
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Valve Does Not Open

  1. Remove valve, leaving fuel lines connected. Supply battery voltage to valve with jumper wire and be sure valve is properly grounded. Pull off Relay 1. Apply battery voltage to connector 87 in relay plug and check that fuel pump runs. Cold start valve should deliver fuel. If not, replace valve.
  2. If valve functions properly, check power supply to valve: Pull plug off valve and connect voltmeter between wires of plug. Start engine. Meter should read battery voltage while cranking engine. If not, trace circuit and repair wiring. See Figure.
  3. Check thermo timer as in Test 12 and replace if resistance values are not correct.
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