The intake manifold for your BMW is a metal cast component that directs controlled air into the intake ports of engine. It is designed to assist streamlining the air flow, resulting in better fuel mileage and more power. The removal of your intake manifold is a moderately challenging task. However, this task can be accomplished by the novice mechanic in less than two hours, using the proper tools.
- Skill level:
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Things you need
- Wrench set
- Coolant drain pan
- Vacuum line plug
- Pry tool
- Ratchet set
- Socket set
- Gasket scraper
- Shop rags
Park your BMW on a level surface. Engage the parking brake and let the engine continue to run. Release the bonnet and prop it open. Open the fuse box cover on the driver's side of the compartment. Pull the relay for the fuel pump and let the engine shut down. Turn off the ignition and put the relay back into the fuse box.
Remove the negative battery cable from the battery by loosening the clamp with a wrench and set the cable out of the way.
Place a coolant drain pan underneath the drain plug under the radiator. Use pliers to open the drain plug and let the fluid pour into the pan. After the fluid is done draining, close the drain plug.
Remove the cover from the throttle cable by removing the bolts with a wrench. Pry the throttle cable off of the throttle body with a pry tool. Remove the vacuum line coming from the brake booster and plug it with a vacuum line plug.
Remove any engine covers that may be blocking access to the intake manifold. Use a ratchet and socket to remove any cover retaining bolts. If there is a ground strap connected to any covers, remove it with a wrench.
Disconnect the ignition coil wire assembly. First you need to remove the bolts holding the wire plate with a wrench. Then pull the wire plugs and the whole assembly will come off.
Label any remaining hoses and electrical connectors with some tape and a marker. Disconnect everything you labelled by pulling and/or squeezing with your hands.
Loosen the clamps on any coolant hoses attached to the intake manifold. Use a screwdriver to loosen the clamps and remove the hoses from the manifold.
Unbolt the intake manifold bolts with a ratchet and socket. Grasp the manifold and remove it. Be sure to remove the old gasket and throw it in the trash. Plug any open holes with a few shop rags to keep foreign objects from falling into the intake ports.
Prepare your work area for a manifold installation by removing any gasket residue from the mating surfaces of the manifold using a scraper.
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