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 OPERATIONDIGITAL MOTOR ELECTRONIC (DME)FUNCTIONAL DESCRIPTIONSKNOCK CONTROL
1993 BMW 740iL (E32/2) V8-3982cc 4.0L DOHC (M60)
Knock Control
1993 BMW 740iL (E32/2) V8-3982cc 4.0L DOHC (M60)SECTION Knock Control
Knock Control:
DESCRIPTION
Signals produced by the knock sensors are compared to set values in the Digital Motor Electronic (DME) programming. When these predetermined values are reached, that combustion process is viewed as "knocking" and the timing is immediately retarded (e.g. 3 deg.). This can occur for one or more cylinders as needed. The ignition retard occurs well before the knock poses a hazard for the engine.
Following knock retardation, the ignition is advanced step by step until the optimum timing point is reached, or until knock is again detected.
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.