Removing Resonance Tube

Component overview

Fig 1: Overview Of Resonance Tube Components

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1. Intake-air distributor
2. Resonance tube
3. Upper part of clamp
4. Rubber sleeve
5. Lower part of clamp
6. M6 x 35 micro-self-locking countersunk screw (inner Torx) → Tightening torque: 4.5 Nm (3.5 ft. lb.) 

1. Detach positive crankcase ventilation lines -2 and 3-  and tank vent connection -1-  from resonance tube.
   Fig 2: Identifying Positive Crankcase Ventilation And Tank Vent Line

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2. Remove clamps -1-  from resonance tube.
   1. 2.1. Unscrew two M6 inner Torx screws -2-  , detach upper parts of clamps and remove them.
      Fig 3: Securing Resonance Tube

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   2. 2.2. Press lower parts of clamps downwards and pull them out.
   3. 2.3. The screws are micro-self-locking and must be replaced.
3. Remove resonance tube.
   1. 3.1. Move rubber sleeves -2-  inwards using a plastic spatula -1-  . To do this, lift rubber sleeve using the plastic spatula -arrow-  and push onto the resonance tube by hand.
      Fig 4: Moving Rubber Sleeves

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   2. 3.2. On the 3.8-Liter engine also pull off a vacuum line and a cable plug from the control valve of the tuning flap.
      1. Resonance tube
      2. Control valve
      3. Vacuum unit
      4. Self-tapping screws
         Fig 5: Tuning Flap Control On 3.8-Liter Engine

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   3. 3.3. Pull the resonance tube out to the rear.
4. Clean the inside of the resonance tube (oil film) with a clean, lint-free cloth.
   1. 4.1. Pay close attention to the tuning flap on the 3.8-Liter engine.
   2. 4.2. Clean the inside of the intake-air distributor likewise as far as possible.