This means that the air intake system, including the intake boot and throttle body, must be removed in order to access the bolt. Section 2 - Removing the Air Intake System In the BMW M52 engine, the intake manifold's lower mounting bolt is located behind the throttle body. The intake manifold is now clear of all of the upper electrical wiring.Fold the engine wiring harness out of the way of the work area. Locate the two engine wiring harness connections and remove them. Using a T30 torx bit, remove the top from the electronics box (E-box) on the right side of the engine compartment.Lay the positive battery cable to the side away from the work area. Unsnap the cable guide and remove the battery cable and wiring harness. Use a 19mm socket wrench to remove the positive battery cable from its terminal on the left side of the engine.
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Trying to remove and install the intake manifold mounting bolts with the fuel injector wiring harness installed can cause damage to the fuel injectors and should be avoided. The wiring harness prevents proper removal and installation of the intake manifold mounting bolts. To prepare the intake manifold for removal, the fuel rail wiring harness needs to be removed.Next, unplug the solenoid valve on the front of the engine.Unplug the crankcase breather hose from the valve cover.Use a small flat blade screwdriver to depress the valve (like letting air out of a tire) until all of the pressure is released from the rail. Put several rags down around the valve to catch and fuel that may come out.The Schrader valve is the same valve found in a car or bicycle tire. Start by locating the Schrader valve on the end of the fuel rail and remove its protective cap. This is a very simple procedure that does not require any special tools. This will save you from a mess when you disconnect the fuel lines from the intake manifold later on in this article. Now is a great time to release the fuel rail pressure.It is not necessary to remove the front fuel rail vacuum line unless you are planning on replacing it.it is connected to the PCV valve on the bottom of the intake manifold and does not hinder the removal process. Disconnect the rear vacuum line from the top of the fuel rail.Also remove the oxygen sensor mounting clips from the fuel rail.this will give you extra space for removing the wiring harness. Carefully stow them safely out of the work area. Begin by unclipping the oxygen sensor wires from the top of the fuel rail as shown below.Remove the engine cover from the vehicle. Remove the two 10mm bolts securing the left engine cover to the fuel rail.Remove the microfilter housing from the vehicle. Pull the battery cable guide free from the front of the microfilter housing.Remove the four T30 torx screws securing the microfilter housing to the body of the vehicle.It is held in place with three thumb screws.
Begin by removing the microfilter (cabin air filter) cover.Attempting work on your engine's electrical system without disconnecting the battery can cause catastrophic damage to sensitive electronics. Before starting this repair you must disconnect the negative terminal from your battery.***The following steps were performed on a 2000 323i.other models may vary. The upper electrical connections, including the fuel injector wiring harness, must be cleared out of the way to make room manifold removal. Section 1 - Removing the Upper Electrical Connections A BMW M52 intake manifold removal starts at the top of the engine.