Special tools required:

WARNING: This page is about a different car, the 2003 BMW X5 and 2002 BMW X5. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: For Special Tool identification, see ENGINE - SPECIAL TOOLS - X5 (4.4L & 4.6L) .

110 224
110 226

IMPORTANT: High tension - mortal danger!
Cut off power supply to ignition coils (disconnect plug connection at DME control unit).

Necessary preliminary tasks:

Connect charger or a second battery.
Read out fault memory of DME control unit.
Pull fuel pump relay or fuel pump fuse.
Start engine and allow residual fuel to drain out (pressure reduction). Remove all spark plugs.

IMPORTANT: Check Schrader valve on special tool 110226 for tight fit.

Screw special tool 110226 by hand into spark plug thread and connect special tool 110224.

NOTE: Check that sealing ring is in perfect condition (see arrow).

Fig 1: Checking Schrader Valve On Special Tool

Courtesy of BMW OF NORTH AMERICA, INC.

Depress accelerator and actuate starter until compression stops rising.

Compression pressure.

Fig 2: Checking Compression

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.

Now clear the fault memory.