Removing the intake plenum

Preliminary work 

• Refer to MOVING THE HOOD TO THE SERVICE POSITION .
• Refer to REMOVING THE ACOUSTIC COVER .
• Refer to REMOVING ACOUSTIC COVER AT REAR .
• Refer to REMOVING THE FRONT UNDERBODY PROTECTION .
• Refer to REMOVING THE STIFFENING PLATE .
• Refer to REMOVING THE COVER OF THE STEERING ASSEMBLY .
• Refer to DRAINING THE COOLANT FROM THE LOW-TEMPERATURE COOLING SYSTEM .
• Refer to CONNECTING THE COOLANT LINE TO THE AUXILIARY COOLANT PUMP .
• Refer to REMOVING LOW-TEMPERATURE COOLANT EXPANSION TANK .
• Refer to REMOVING TANK VENT VALVE .

• Loosen screw (1).
• Guide tank ventilation line (2) out of clamp (3) and remove it.

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• Unlock and release the plug connections (1).
• Unlock the locks (2).
• Guide tank ventilation line (3) out of clamp (4) and remove it.

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• Unlock the locks (1).
• Feed the tank ventilation line (2) out and set it aside.

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• Unlock the locks (1).
• Feed out the wiring harness section (2) for the sensor system 2 and set it aside.

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• Loosen screws (1).
• Feed out charge air line (2) and place to one side.

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• Unlock and release plug connection (1).
• Loosen clamp (2).
• Thread off coolant line (3) and place to the side.
• Loosen screw (4).

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• Unlock and release plug connection (1).

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• Unlock the locks (arrows).
• Feed out the wiring harness section (1) for the injectors and ignition coils and put to one side.

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• Guide tank ventilation line (1) out of clamp (2) and place it aside.

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• Feed out the wiring harness section (1) for the injectors and ignition coils of the cylinder head cover (2) and put to one side.

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• Loosen screw (1).

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• Unlock and loosen coolant line (1).
• Catch and dispose of escaping coolant.

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• Loosen screws in the order (7) to (1).
• Slightly lift intake plenum (A) in arrow direction.
  Fig 1: Intake Plenum Screws Loosening Sequence

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  NOTE: TECHNICAL INFORMATION 
  The tension rod screws and mounting bolts from the connecting neck on the intake plenum are not  allowed to be opened.
• Do not release screws in the marked area  on the intake plenum (1).

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  NOTE: TECHNICAL INFORMATION 
  Additional coolant can leakage. Make sure that no coolant enters the intake port of the cylinder head.
• Unlock and release the coolant line (1) under the intake plenum (2).
• Catch and dispose of escaping coolant.
• Feed out the intake plenum (2) and remove it.
• Empty the remaining coolant (2) from the intake plenum (1).

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  NOTE: TECHNICAL INFORMATION 
  The tension rod screws and mounting bolts from the connecting neck on the intake plenum are not  allowed to be opened.
• Do not  release screws in the marked area  on the intake plenum (1).

Courtesy of BMW OF NORTH AMERICA, INC.