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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 2: Fuel Injectors
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Test 2: Fuel Injectors

  1. Check for fuel delivery at injectors. If one or more injectors is not operating correctly, start engine and check for movement of needles in injectors. Movement can be felt with finger.
  2. If no movement is detected, check power lines and coil of fuel injectors according to procedures in BMW Service Test, L-Jetronic step 5  . If test value is incorrect, check wiring for shorts, breaks or poor connections and repair as needed. If wiring is okay, replace defective fuel injectors.
  3. If test value is correct, check power supply to injectors: Connect a voltmeter between wire 87 (Red/Blue) on Relay 2 and ground (relay plugged in). Meter should read battery voltage. If not, go to TEST 3  for Motronic Control Unit.
  4. If voltage is correct, check activation of injectors (BMW Service Test, L-Jetronic step  2). If test value is incorrect, replace MCU.
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