manufacturer decided they wanted a unique system of fuel injection, at least different then that of most systems. The control valve may act up and not allow fuel to inject at intervals. Instead, it may take be clogged with debri, gunk, and other trash which needs to be serviced in a shop to be repaired. One very common activity with your fuel injector is it may cause the valve to stay closed and burn gas in a manner that is inconsistent with normal gas usage, the vehicle will start to blow out black and dark smoke out the rear end, trick your cars oxygen sensor, and allow the system to burn a larger amount of fuel for the same mileage. This problem needs to be solved in a shop where the equipment is available to make adjustments and flush out your system.