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 MANAGEMENTTRANSMISSION CONTROL SYSTEMSDESCRIPTION AND OPERATIONFUNCTIONAL DESCRIPTIONGEARSHIFT COMFORT CONTROL
1987 BMW L7 (E23) L6-3430cc 3.4L SOHC (M30)
Gearshift Comfort Control
1987 BMW L7 (E23) L6-3430cc 3.4L SOHC (M30)SECTION Gearshift Comfort Control
Gearshift Comfort Control
The gearshift quality is controlled by way of the modulation pressure and the engine intervention function (torque reduction by retarding the ignition timing). The main pressure is constantly calculated by way of an algorithm with tuning-specific parameters (engine torque, differential speed [engine speed difference before and after shifting], output speed and constant pressure component).
The gearshift quality is controlled by way of the modulation pressure and the engine intervention function (torque reduction by retarding the ignition timing). The main pressure is constantly calculated by way of an algorithm with tuning-specific parameters (engine torque, differential speed [engine speed difference before and after shifting], output speed and constant pressure component).
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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.