12 13 511 Replacing ignition coils (S63 B44 T 0)

Necessary preliminary tasks:

Read out the fault memory of the DME control unit.
Check stored fault messages and process procedure.
Switch off ignition.
Remove ACOUSTIC COVER
Release EXPANSION TANK for charge air cooler and place to one side, do not remove.
Release EXPANSION TANK for hydraulic steering and place to one side, do not remove.
Release DME CONTROL UNIT FOR CYLINDERS 1-4 and place to one side, do not remove.
Release DME CONTROL UNIT FOR CYLINDERS 5-8 and place to one side, do not remove.

IMPORTANT: Ignition coils must not be contaminated by fuel.
The resistance of the silicone material is reduced significantly by contact with fuel, which may cause the ignition coil to fail!
The silicone tube of the spark plug connector is coated with talc to reduce the pulling forces. The silicone tube must NOT be oiled or greased. This would greatly reduce the durability of the silicone material, which can lead to a malfunction of the ignition coil.

Remove left and right upper section of intake filter housing.

NOTE: Description for left air filter box. Procedure on right side identical.

Release connector (1) on hot film air mass meter and disconnect.

Release clamp (2).

Tightening torque 13 71 2AZ .

Release screws along line (3).

Fig 1: Identifying Connector, Clamp And Intake Filter Housing

Courtesy of BMW OF NORTH AMERICA, INC.

Tightening torque 13 71 3AZ .

Release hose (4) from intake silencer housing.

Remove upper section of intake filter housing (5).

Unlock connector catch (1) on ignition coil (2) and pull off connector (2).

Pull out the ignition coil (2) slowly in a smooth upwards movement.

NOTE: There is a possibility that the silicone tube will tear and therefore be destroyed.

This procedure is applicable to all ignition coils.

Fig 2: Unlocking Connector Catch

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note:

Position the ignition coil and gently push it to the limit position, if necessary by twisting it back and forth slightly. Then check anti-twist lock.

The rubber cap (3) must fully enclose the sealing collar of the cylinder head cover.

NOTE: If rubber parts are squashed, the ignition coil can slip out again during engine operation.

Push connector (1) with connector catch (2) open onto ignition coil.

Carefully close connector catch (2) in direction of arrow.

The connector catch must snap into place without great effort.

Fig 3: Pushing Connector

Courtesy of BMW OF NORTH AMERICA, INC.

The connector must be positioned on the counter piece with hardly any gaps when the locking lever is being closed. In the process, the cheeks of the lever are positioned inside the counter piece.

NOTE: The locking lever can become deformed if it is not installed correctly. This means that there is no longer a safety lock on the plug connection. As a result, the connector can slip out during engine operation (loose contact, misfiring).

NOTE: Delete fault memory.