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 OUTPUTSDIFFERENTIAL AIR INTAKE SYSTEM (DISA)
1993 BMW 740iL (E32/2) V8-3982cc 4.0L DOHC (M60)
Differential Air Intake System (DISA)
1993 BMW 740iL (E32/2) V8-3982cc 4.0L DOHC (M60)SECTION Differential Air Intake System (DISA)
Vehicle: E36 - M42/M1.7, M44/M5.2
DISA allows the dynamics of the incoming air charge to take advantage of a long pipe at mid-range RPM. This produces a ram air effect that increases engine torque at mid range. At high speed the change over valve switches allowing the engines breathing dynamics to switch to the short air pipes.
This change enables additional power output at the upper RPM range. The change over valve is held normally open by spring pressure and closed by vacuum.Control of the DISA solenoid is an output function of the ECM. DISA is the intake manifold arrangement on the M42 and M44 that provides the advantages of both long and short intake pipes.
The system is activated initially by the ECM which provides a switched ground to the vacuum solenoid valve. The balance of the system operates via vacuum/mechanical functions.
RENDER: 1.0x
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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.