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 MANUALSBMW1993740IL (E32/2) V8-3982CC 4.0L DOHC (M60)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSDESCRIPTION AND OPERATIONENGINE CONTROL SYSTEM OUTPUTSEXHAUST FLAP DAMPER CONTROL
1993 BMW 740iL (E32/2) V8-3982cc 4.0L DOHC (M60)
Exhaust Flap Damper Control
1993 BMW 740iL (E32/2) V8-3982cc 4.0L DOHC (M60)SECTION Exhaust Flap Damper Control
EXHAUST FLAP DAMPER CONTROL (MS41.1 328 & 323i/is Models)
To meet European noise level compliance, the silencer of the the above noted vehicles incorporate a flap that is designed to reduce exhaust noise at idle, low RPM and while coasting. Components of the system include:
- Exhaust flap with vacuum actuator
- Vacuum reservoir
- Switching solenoid
- Check valve
OPERATION
The MS41 .1 Control Module will power the switching solenoid and apply vacuum to the exhaust flap actuator for the following conditions:
- Engine idle - up to 2500 RPM
- Engine decel
This will close the flap allowing additional damping of the exhaust to take place.
The solenoid will switch OFF when accelerating above 2500 RPM. The vacuum is vented from the flap actuator and the flap opens. This allows the M52 engine to make maximum use of the backpressure effect for improved torque response
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.