BMW X5 Owners & Service Manuals

BMW X5: Ignition Management

Most of the ignition system components have remained the same for all NG6 engines for 2007. There are some minor changes to the ignition coils that apply to all versions. The coils have been optimized for more durability.

Spark Plugs

The spark plugs for the N51 and N52KP remain the same as N52. However, the N54 uses a completely new spark plug from Bosch. The spark plug design consists of a 12 mm thread which contrasts from the 14 mm design on the N52 which prevents any possibility of improper installation.

The hex on the spark plug is also a 12 point design which requires a special tool. The tool (socket) has a "thinwall" design to facilitate access in the confined area of the N54 cylinder head.

Engine Service Information
Fig. 69: Identifying Spark Plugs

Spark Plug Diagnosis (N54)

Due to the proximity of the spark plug to the fuel injector nozzle, any divergence in the fuel spray may cause possible spark plug damage. This makes spark plug diagnosis an important part of N54 service concerns.

Information gained by the spark plug diagnosis may indicate possible fuel injector faults. Spark plug replacement interval has been reduced to 45,000 miles for the N54.

The Fig. 70 below can be used to assist in diagnosis:

Engine Service Information
Fig. 70: Identifying Spark Plug Wear Pattern


 Emissions Management

The N54 and N52KP meet ULEV II requirements for 2007. There are not many changes to the emission systems on these engines. The N54 engine has 2 underbody catalysts in addition to the "near engine" c

 Performance Controls

Cooling System The cooling system of the N54 engine consists of a radiator circuit and an isolated oil cooling circuit. The fact that there is an isolated oil-cooling circuit ensures that heat is not

 Steering And Wheel Alignment


 Fuel Pick-Up, Cleaning

GENERAL FUNCTION DESCRIPTION FOR FUEL SUPPLY SYSTEMS Fuel supply systems, spark-ignition engines Fuel system The electric fuel pump in the fuel tank generates the pressure in the fuel system which is set by the pressure regulator to a specific level. Tank venting system The tank venting system is a

 Danger Of Poisoning If Oil Is Ingested/Absorbed Through The Skin

Danger of poisoning! Ingesting oil or absorbing through the skin may cause poisoning! Possible symptoms are: Headaches Dizziness Stomach aches Vomiting Diarrhoea Cramps/fits Unconsciousness Protective measures/rules of conduct: Pour oil only into appropriately marked containers Do not po

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