why engine off when key switch turned off?

what is the reason behind while we turned key switch off engine is also shut off give me to answers for if it is an petrol or diesel engine,2-wheeler or 4 wheeler or it is big heavy machine engines.every body will told that it will dis engage the spark plug connection,or shut off solenoid turned on.if this will occur the engine must have to air lock due to lack of diesel.

4 Answers

  • 9 years ago
    Best Answer

    interesting question but i'm sorry i think its bcoz of engine

  • 9 years ago

    Key off means no spark in a gas engine and no fuel in a diesel , and no there will be no air lock as the valves still work and air is still compressed. Very simple system to understand.

  • that is how it is designed. if it is a gas engine, the spark is lost due to a lack of power to the ignition coil. if it is a diesel, then the fuel is stopped and the engine stops due to that.

  • 9 years ago


    When you turn the key to off it disconnects the power supply to the ignition system, which supplies power to the plugs (spark or glow) and the power to any accessories, fuel pump, fan's ETC.

    hopes this answers your question

    good luck


    Source(s): 40+ years expeirnece
Still have questions? Get your answers by asking now.