BMW X5: Fuel Supply System

 Replacing Air Supply Unit (Version With Dynamic Drive)

WARNING: Danger of injury! Drain the air spring system before carrying out any work on the air supply unit, air pipes and air springs! Danger of injury if this instruction is not complied with! Risk of damage! Extreme cleanliness must be ensured in the connection area of the pipes during removal and

 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