Check injector valves for leaks:

WARNING: This page is about a different car, the 2003 BMW 530i, 2002 BMW 530i, and 2001 BMW 530i. However, it is still accessible from the selected car via links, so may be relevant.

Check injector valves for leaks: Clip fuel injectors into special tool 13 6 205.

Fig 1: Clipping Fuel Injectors Into Special Tool 13 6 205

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Connect special tool 13 6 206 to the injector valves.

Fig 2: Connecting Special Tool 13 6 206 To The Injector Valves

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To catch remaining fuel, wrap fuel injectors in clean cleaning cloth. Connect special tool 13 6 206 to a 12 V car battery.

Connect special tool 13 6 205 to compressed air connection of max. 5 bar.

Residual fuel is now blown out of the injector valves.

CAUTION: Carry out leak test only after remaining fuel has been blown out of injector valves.

Separate special tool 13 6 206 from the injector valves.

Separate special tool 13 6 206 from the injector valves. Install injector valves with special tool 13 6 205 in a container with hot water (60-80°C).

Adjust air pressure at connection (1) on special tool 13 6 205 to max. 3 bar (motorsport models max. 5 bar).

Fig 3: Adjusting Air Pressure At Connection (1) On Special Tool 13 6 205

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Note volume of air emerging.

Permitted volume of air emerging: 2 air bubbles per injector valve within a 15 second period.

Note injector valves with larger volumes of air emerging.

Injector valves with larger amounts of air emerging must be cleaned.

Remove fuel injectors from water and dry thoroughly with compressed air.