On a technical note, a "starter interrupt" could not reasonably affect a running vehicle (the starter motor only runs when turning over a stopped engine). Howe

On a technical note, a "starter interrupt" could not reasonably affect a running vehicle (the starter motor only runs when turning over a stopped engine). However, if these devices actually operate inline with the ignition system--delivering or interrupting spark to the fuel-air mixture during operation--that's an entirely different matter and cause for safety concerns.