BMW Cars 1999-06

Fuel Injectors

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Removal & Installation



  1. Remove the upper intake manifold.
  2.  
  3. Disconnect the electrical connectors for the fuel injectors and place the harness aside, then remove the dampening valve vacuum hose at the front of the fuel rail.
  4.  
  5. The two hose clamps for the fuel rail return line are stamped to be tamper proof. To remove, use a locking pliers and attach then onto the clamp-s adjustment screw head securely. Turn the adjustment screw counterclockwise until the clamp is loosened. Loosen both clamps and slide to the middle of the fuel line.
  6.  
  7. Using a 12 mm line wrench, loosen the fuel rail feel line flare nut and once loose, slide the flare nut away from the fuel rail.
  8.  
  9. To avoid debris from entering the injector ports, If compressed air is available, using an air nozzle, and wearing eye protection, carefully spray compressed air around the base of the injectors. If excessive debris exists, spray the base of the injectors with an evaporating brake cleaner and spray again with compressed air. If compressed air is not available, spray the brake cleaner to clean as best as possible.
  10.  
  11. Using a 10 mm socket, short extension and a ratchet, remove the two fuel rail mounting bolts.
  12.  
  13. Use a clean shop towel folded over several times to form a small pad, and place on the corner of the valve cover. Then using a suitable and sturdy prytool, slowly and carefully lift the fuel rail until the injectors are just removed from the manifold, then remove the fuel feed and fuel return lines away from the fuel rail and remove the entire assembly with the large vent hoses still attached and set aside.
  14.  

  1. Remove the upper intake manifold.
  2.  
  3. Disconnect the electrical connectors for the fuel injectors and place the harness aside, then remove the dampening valve vacuum hose at the front of the fuel rail.
  4.  
  5. The two hose clamps for the fuel rail return line are stamped to be tamper proof. To remove, use a locking pliers and attach then onto the clamp-s adjustment screw head securely. Turn the adjustment screw counterclockwise until the clamp is loosened. Loosen both clamps and slide to the middle of the fuel line.
  6.  
  7. Using a 12 mm line wrench, loosen the fuel rail feel line flare nut and once loose, slide the flare nut away from the fuel rail.
  8.  
  9. To avoid debris from entering the injector ports, If compressed air is available, using an air nozzle, and wearing eye protection, carefully spray compressed air around the base of the injectors. If excessive debris exists, spray the base of the injectors with an evaporating brake cleaner and spray again with compressed air. If compressed air is not available, spray the brake cleaner to clean as best as possible.
  10.  
  11. Using a 10 mm socket, short extension and a ratchet, remove the two fuel rail mounting bolts.
  12.  
  13. Use a clean shop towel folded over several times to form a small pad, and place on the corner of the valve cover. Then using a suitable and sturdy prytool, slowly and carefully lift the fuel rail until the injectors are just removed from the manifold, then remove the fuel feed and fuel return lines away from the fuel rail and remove the entire assembly with the large vent hoses still attached and set aside.
  14.  

M50/M52/S50 Engines
  1. Relieve the fuel pressure and disconnect the negative battery cable.
  2.  
  3. Remove the injector valley cover and disconnect and remove the plug plate.
  4.  
  5. Pull off the vacuum hose from the pressure regulator. Disconnect the fuel feed and return hoses from the fuel rail.
  6.  
  7. Unscrew the fasteners holding the fuel rail and remove the fuel rail along with the injectors.
  8.  
  9. Pull off the retainers and remove the injectors. If replacing an injector use the correct style and code number for the application.
  10.  

To install:

  1. Inspect the O-rings and replace as necessary. Replace the injectors on the fuel rail and fit the retainers in place.
  2.  
  3. Lubricate the O-rings with Vaseline or gear oil prior to installation and replace the fuel rail.
  4.  
  5. The remaining components are installed in the reverse order from which they were removed.
  6.  
  7. Connect the negative battery cable, start the engine and check for fuel leaks.
  8.  

M60/M62 Engines
  1. Relieve the fuel system pressure. Disconnect the negative battery cable.
  2.  
  3. Remove the oil filler cap. Unclip the four caps and remove the nuts. Remove the manifold cover.
  4.  
  5. Remove the cable securing straps and disconnect the throttle cable on the throttle valve lever.
  6.  
  7. Unscrew and remove the guards for the cylinder head covers on both sides.
  8.  
  9. Remove the electrical connectors for the ignition coils.
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  11. Unclip and move aside the throttle cable. Unscrew and move aside the wiring ducts. Remove the fuel injector connectors.
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  13. Plug the fuel feed and return lines with special tool 13 3 010, or equivalent.
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  15. Unbolt the injection pipe rail and remove the rail together with the fuel injectors.
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  17. Press off the clip and remove the fuel injector.
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To install:

  1. Check the O-rings on the injector and replace if necessary. Check that all the injectors are of like types. Lightly grease the O-rings with petroleum jelly and install on the fuel rail.
  2.  
  3. Install the fuel rail and tighten the bolts to 6-8 ft. lbs. (9-11 Nm). Unplug and connect the fuel lines.
  4.  
  5. Connect the fuel injector connectors. Install the wiring ducts. Position and clip the throttle cable.
  6.  
  7. Install the electrical connectors for the ignition coils.
  8.  
  9. Position the guard for the cylinder head cover and install the mounting bolt. Repeat the process on the other side.
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  11. Connect the throttle cable on the throttle valve lever and connect the cable securing straps.
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  13. Install the manifold cover, replace the caps and replace the oil filler cap.
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  15. Connect negative battery cable.

    Click image to see an enlarged view

    Fig. Fuel injector-M60/M62 engines

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