What does it mean that the concentration of Discovery 3 4.4 displacement system is too thin?

There are several main reasons for your situation.

First, the fuel pressure is too low, which is generally caused by the damage of the oil pressure regulator or the pressure relief of the oil return pipe.

Second, the engine intake pipe leaks air, resulting in too much intake air and too thin mixture.

Third, the nozzle hole is blocked, which may generally be caused by your nozzle not being cleaned for a long time.

Fourthly, sensor failures of electronic control system generally include water temperature, intake air temperature, air flowmeter, throttle position sensor, atmospheric pressure sensor, oxygen sensor, etc.

Finally, there is something wrong with the engine computer, but it rarely happens.

I hope I can help you. Have a nice trip! If there is something wrong with your car, ask the car mechanic. 4S shop professional technician, 10 minutes to solve.