1982 BMW 633CSi Automatic TransFACTORY OEM SERVICE PROCEDURE

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.
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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