Maximum fuel consumption of the engine vehicles is the fuel consumption during the stops and starts of the vehicle. Especially in urban use, fuel consumption during waiting period on traffic lights and idle running cannot be underestimated. With the Injector Deactivation, fuel consumption will be reduced during stoplight, standstill, idle running, downhill descents and quiet driving (at the straight road where the speed limit should not be exceeded). Besides this, another unnecessary consumption which cannot be underestimated and could be considered as a wastage is the fuel consumption on the roads with speed limits caused only due to the large engine volume, even though there is no need for more power. Therefore, in this type of engines, fuel economy will be possible as preventing unnecessary power generation by deactivating 1, 2 or more cylinders. With injector deactivation, at the situations where not much power is desired, the driver takes his foot off the pedal and the system developed by this Injector Deactivation will activate and fuel economy will be possible by deactivating 1, 2 or more cylinders.