Audi 80 Quiz
MPI and MPFI Injection Systems

Fuel cut-off during overrun (coasting)

In this manual: MPI and MPFI Injection Systems
Technical Description — 39Engines — 41Exhaust System — 13Cooling System — 28Fuel tank and fuel pump — 12Air Filter and Intake Ducts — 13Mono-Motronic Injection System — 18Digifant Injection System — 19KE-III-Jetronic Injection System — 35MPI and MPFI Injection Systems — 32Clutch — 11Transmission and Driveline — 21Suspension and Steering — 33Brake System — 41Anti-lock brake system — 8Wheels and Tires — 13Body Electrical System — 35Ignition System — 24Lighting — 14Signaling Devices — 7Instruments and Auxiliary Equipment — 54Heating and Ventilation — 7Body Components — 18Troubleshooting — 6Specifications — 13
~1min read

When the vehicle is driving downhill and the accelerator pedal is not depressed, the engine does not require fuel. The vehicle moves under its own weight or by inertia. Based on high engine speed and the closed throttle position (via the throttle position potentiometer), the control unit recognizes overrun (coasting) mode and may switch to the "fuel economy" position.

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A quick Audi 80 quiz: every answer comes with an explanation and a link to the manual page.