Audi Q7: Instruments

 Radio Installation Instructions

Retrofitting Radio Systems General Information Before installing radios and telephone systems (radio systems), disconnect the negative terminal of the Battery -A-. Refer to →Electrical Equipment; Rep. Gr.27. Use the applicable wiring diagrams. Refer to → Wiring diagrams, Troubleshoo

 Ignition and Timing

Ignition A spark ignition (SI) engine requires a spark to initiate combustion in the combustion chamber. Voltage is supplied to the spark plug where the electricity will arc across a gap at a voltage as high as 100 kilovolts. The ECM determines the precise moment to fire each spark plug using ig