BMW 1999-2005 M3 Service Manual page 339

Fuel Injection
2 of 19
http://ebahn.bentleypublishers.com/BMW/3/E46/Repair%20Manuals/1...
Working above engine, disconnect
electrical harness connectors:
VANOS control unit harness
connector (A)
Connectors for oxygen sensors
(B)
Connector for intake air
temperature sensor (C)
CAUTION!
Mark oxygen sensor harness
connectors in order to avoid
reversing them during installation.
Incorrect reconnection can cause
serious engine damage.
Disconnect fuel injector electrical
connectors from injectors:
Use small screwdriver to pry one
corner of wire lock clip on fuel
injector 1 connector.
Repeat for all injectors.
Lift off connector loom and set
aside.
Unscrew schræder valve cap (arrow)
from fuel rail. Unscrew fuel tank cap to
release pressure to vent tank.
Using a brief burst of compressed
-
air (maximum of 3 bar or 43.5 psi)
blow fuel back through return line
into fuel tank.
2/25/2009 9:55 PM