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 MANUALSBMW1994318IS (E36) L4-1796CC 1.8L DOHC (M42)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSDESCRIPTION AND OPERATIONFUNCTIONAL DESCRIPTIONSDECELERATION FUEL CUT-OUT
1994 BMW 318is (E36) L4-1796cc 1.8L DOHC (M42)
Deceleration Fuel Cut-Out
1994 BMW 318is (E36) L4-1796cc 1.8L DOHC (M42)SECTION Deceleration Fuel Cut-Out
OPERATION
To reduce fuel consumption, the deceleration fuel cut-out is activated when the throttle valve is closed and the engine speed is above approx. 1000... 1200 rpm. The Digital Motor Electronic (DME) cuts out the injection and shifts the ignition timing in the retard direction until the engine speed has dropped below the cut-in speed. Below this engine speed, fuel injection cuts in once again and the ignition timing moves towards the advance direction once again. The cut-in speed is dependent upon the engine temperature and the drop in engine speed.
To reduce fuel consumption, the deceleration fuel cut-out is activated when the throttle valve is closed and the engine speed is above approx. 1000... 1200 rpm. The Digital Motor Electronic (DME) cuts out the injection and shifts the ignition timing in the retard direction until the engine speed has dropped below the cut-in speed. Below this engine speed, fuel injection cuts in once again and the ignition timing moves towards the advance direction once again. The cut-in speed is dependent upon the engine temperature and the drop in engine speed.
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.