BMW X5 Owners & Service Manuals

BMW X5: Engine Diagnosis

Engine Diagnosis

When attempting to diagnose driveability complaints, always consider the basics. Regardless of the level of technology employed on an engine, it still needs a few basic things to occur in order to run properly. Whether the engine is very basic or uses so-called "New Generation" technology always refer to the basic principles first.

Any engine using four-cycle spark-ignition principles must meet the same fundamental conditions to run properly. Most engine related driveability problems fall into a few basic categories:

Engine Diagnosis
Fig. 1: Sectional View Of Engine

When referring to engine basics, all engines need fuel, air and spark to run. However, in order for a spark-ignition engine to run properly, a few things must be taken into consideration. The fuel, air, spark principle can be broken down further into the following categories:

Engine Diagnosis
Fig. 2: Operation Of Valvetronic


 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 l

 Workshop Hints On Cylinder Leakage Testing

When performing cylinder leakage tests, the following tips might be helpful: Remove all spark plugs to allow easier rotation of the engine. (If this test is done after a compression test, the plugs s

 Ignition System Diagnosis

The ignition system on modern BMW engines consist of one ignition coil per cylinder. This arrangement is known as RZV, or Direct Stationary Ignition. The ignition coil receives fused power usually f


 Instructions For Handling Light Bulbs (Exterior Lights)

WARNING: Xenon headlights: Danger to life due to high voltage! Work on the entire xenon lighting system (ignition unit, control unit and lamp) may only be carried out by specialist personnel. WARNING: Halogen lamps are under pressure: To avoid injury, wear protective goggles and gloves. IMPORTANT:

 Removing And Installing / Replacing Master Brake Cylinder For DSC

Special tools required: 32 1 27032 1 270 PLUGS (SET) Necessary preliminary tasks: Remove expansion tank. Read and comply with General Information. After completing tasks, bleed brake system with DSC. IMPORTANT: Do not bend brake lines. Unfasten brake lines (2). Unclip retaining bar (1) and r

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