BMW X5: Engine

 Fuel Supply System - System Functions

> E65, E66 The fuel supply system on the BMW 7-Series is requirement-orientated and thus depends on consumption. The DME calculates the amount of fuel required on the basis of various operating variables. In turn, the engine's current fuel requirement is calculated from this value. The DME r

 Compression Testing

In order for an engine to run smoothly and efficiently, the combustion chamber must be free of leakage. An engine with low compression in one or more cylinders is inefficient and will run rough or lack in performance. Low compression may or may not cause the MIL to illuminate. Low compression ca