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 MANUALSBMW1999328I 4D SEDAN, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMMS42/MS43 - OVERVIEWMS42/MS43PERFORMANCE CONTROLSTORQUE INTERFACES
1999 BMW 328i 4D Sedan, Standard
Torque Interfaces
1999 BMW 328i 4D Sedan, StandardSECTION Torque Interfaces
If torque reduction or increase is required for ASC/DSC/MSR/AGS, the ECM will regulate engine power in the following manner:
- If less torque is required, the ignition timing is reduced (fast intervention), the idle speed actuator and MDK/EDK reduce intake air.
- If increased torque is required (MSR), the idle speed actuator and MDK increase intake air.
The data required for engine torque manipulation is relayed via the CAN bus.
RENDER: 1.0x
NO RELATED
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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.