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.
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HOMESERVICE MANUALSBMW1987L7 (E23) L6-3430CC 3.4L SOHC (M30)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSCRANKSHAFT POSITION SENSORDESCRIPTION AND OPERATIONCYLINDER REFERENCE SENSOR (IN BELLHOUSING)
1987 BMW L7 (E23) L6-3430cc 3.4L SOHC (M30)
Cylinder Reference Sensor (In Bellhousing)
1987 BMW L7 (E23) L6-3430cc 3.4L SOHC (M30)SECTION Cylinder Reference Sensor (In Bellhousing)
Fig. 11 Speed sensor/Reference sensor:
This sensor is located in the bellhousing next to the engine speed sensor. It supplies the ECU with crankshaft position information. Once the ECU has determined the optimum timing advance (through the various sensors), it uses this position information to actually fire the ignition.
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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.