Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1985 BMW 635CSi AutomaticFACTORY OEM SERVICE PROCEDURE
Test 2: Fuel Injectors
- Check for fuel delivery at injectors. If one or more injectors are not operating correctly, start engine and check for movement of needles in injectors. Movement can be felt with finger.
- If no movement is detected, check the power lines and the coil of the fuel injectors according to the procedures in the BMW TEST KIT, L-JETRONIC PROCEDURES BROCHURE, step 5). See DESCRIPTION . 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.
- 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.
- If voltage is correct, check activation of the injectors. See BMW TEST KIT, L-JETRONIC PROCEDURES BROCHURE, step 2). See DESCRIPTION . 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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