If your E46 328i is showing some trouble idling or is giving you error messages, it could be time to clean your intake manifold. The manifold is responsible for controlling the amount of air entering the engine based on the level of acceleration that is being applied by the accelerator. Removing the intake manifold does take some time and will require a significant set of tools in order to begin.
- Skill level:
- Moderately Easy
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Things you need
- Metric Allen wrench set
- Metric socket wrench set
- Socket wrench
- Metric open wrench set
- Flathead screwdriver
Park your car on a level surface and let the engine cool down completely. Disconnect the battery located in the boot.
Remove the plastic air box attached to the intake manifold by using your metric wrenches to unscrew its three mounting points in the engine bay.
Use your flathead screwdriver to loosen the bracket that holds the air intake hose to the metal intake manifold. Pull the air box out.
Disconnect the air sensor that is attached to the air box. Set the air box assembly aside.
Press into the circular metal plate that is on the inside of the intake manifold to pull the throttle cable off of the manifold.
Unplug the second air sensor that is attached to the top of the intake manifold's assembly.
Remove the two bolts that sit on both the left and right hand sides of the intake manifold using a metric Allen wrench.
Set the first piece of the metal intake manifold aside. Remove the four bolts that secure the second portion of the manifold to the engine.
Grasp the metal tube that remains connected to the engine and pull it directly out to complete the removal.
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