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If the device is correctly installed it should not kill the engine but prevent it from starting, just like smart keys.



Correct; usually the installer instructions will say to wire the hardware so it disables the starter motor. This means that the engine won’t stop, but rather be prevented from starting.

Some of the cheaper (AliExpress) hardware installation instructions say that the relay should be wired to the fuel pump.

I wonder if the starter vs. fuel pump is a regional difference? Perhaps in countries where vehicle theft is more prevalent/violent installers would lean towards cutting the fuel pump?


On a car with a manual transmission, killing the starter doesn't do much as you can bump start the car (get the engine spinning by driving the engine via the transmission rather than the starter).


As far as I know, most of the devices kill the engine, but only when vehicle speed is near zero.




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