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M54 6 Cylinder Engine Fuel Injectors Replacement
 
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Pelican Technical Article:

M54 6 Cylinder Engine Fuel Injectors Replacement

Nick Czerula

Time:

2 hours2 hrs

Tab:

$300

Talent:

****

Tools:

Set of sockets, 10mm, flathead screwdriver

Applicable Models:

BMW X3 Sport Utility (2004-06)

Parts Required:

Fuel injectors, fuel injector O-rings

Hot Tip:

Work with a cool engine and relieve fuel system pressure

Performance Gain:

Clean and even flowing fuel injectors

Complementary Modification:

Replace with performance injectors

BMW X3 models with a M54 6-cylinder engine utilize one fuel injector per cylinder. Each fuel injector is an electrically controlled solenoid which, when triggered by a pulse from the engine control module, sprays a precisely metered amount of atomized fuel directly into the cylinder head intake port. The ECM supplies constant power to the injectors; injector opening is controlled by the ground side of the circuit. Since fuel pressure at the injectors is (relatively) constant, the length of time (in milliseconds) of grounding pulse from the ECM determines the amount of fuel injected.

Over time fuel injectors can become restricted or fail electrically. If you have an injector giving you a problem, I suggest replacing them in sets. This way you maintain an even flow from all the injectors.

The injectors' shared fuel supply is a steel fuel rail. To remove an injector, you have to disconnect the electrical connectors to all the injectors, then remove the fuel rail with all injectors attached to it. Individual injectors are then separated from the fuel rail, as needed. If you remove the fuel injectors for any reason (for example, to replace the intake manifold) and you plan to reuse the fuel injectors, replace all the fuel injector sealing O-rings.

It's a good idea to relieve fuel system pressure before beginning. This will minimize the amount of fuel spilled. The best way to relieve fuel system pressure is to remove the fuel pump fuse and run the vehicle until the engine stalls.

Keep in mind that when your car was serviced before, parts may have been replaced with different size fasteners used in the replacement. The sizes of the nuts and bolts we give may be different from what you have, so be prepared with different size sockets and wrenches.

Protect your eyes, hands and body from fluids, dust and debris while working on your vehicle. If working with the electrical system, disconnect the battery before beginning. Always catch fluids in appropriate containers and properly dispose of any fluid waste. Recycle parts, packaging and fluids when possible. Do not work on your vehicle if you feel the task is beyond your ability.

Vehicle models change and evolve as they grow older, so the vehicle shown in our illustrations may vary slightly from yours. If something seems different, let us know and share your info to help other users. Questions or want to add to the article? Leave a comment below. When leaving a comment, please include your vehicle information.

Remove the engine covers. See our tech article on removing engine covers.

BMW X3 models with a M54 6-cylinder engine utilize one fuel injector per cylinder (red arrows).
Figure 1

BMW X3 models with a M54 6-cylinder engine utilize one fuel injector per cylinder (red arrows).

Be prepared to catch leaking fuel when the fuel lines are disconnected.
Figure 2

Be prepared to catch leaking fuel when the fuel lines are disconnected. Disconnect the negative (-) battery cable. See our tech article on battery connection notes. Working at the fuel rail, remove the fuel test port cap. Then place a rag over the Schrader valve and open the valve with a flathead screwdriver (red arrow) to relieve any remaining pressure.

Working near the left strut tower, reach beneath the intake manifold (rear corner).
Figure 3

Working near the left strut tower, reach beneath the intake manifold (rear corner). Follow the fuel line (red arrow) to the fuel rail connection until you locate the quick connect. To disconnect the fuel line, press and hold the release collar (blue arrow) while pulling the fuel line straight off. Have a rag handy to catch any dripping fuel. Follow the fuel line behind the intake manifold, near the firewall. You can see the line, but will have to do this part mostly by feel. Reach behind the intake manifold.

Working at the top of intake manifold, locate the oxygen sensor connectors.
Figure 4

Working at the top of intake manifold, locate the oxygen sensor connectors. Remove (red arrow) both square connectors out of the mounting bracket and lay them aside. Front connector shown, repeat for rear connector.

Then pull the other two oxygen sensor connectors (red arrow) out of the mounting brackets and lay the harness aside.
Figure 5

Then pull the other two oxygen sensor connectors (red arrow) out of the mounting brackets and lay the harness aside. Front connector shown, repeat for rear connector.

Pull the oxygen sensor harnesses out of the mounting clip at the rear of the intake manifold.
Figure 6

Pull the oxygen sensor harnesses out of the mounting clip at the rear of the intake manifold. Then locate the wire tie (red arrow) and cut it. Be sure to install a new wire tie when reinstalling the fuel injectors.

Working at the front left corner of the valve cover, disconnect the breather hose (blue arrow) by squeezing the collar and pulling it straight off.
Figure 7

Working at the front left corner of the valve cover, disconnect the breather hose (blue arrow) by squeezing the collar and pulling it straight off. Then disconnect the VANOS solenoid electrical connector (red arrow) be pressing the wire release and pulling it straight off the solenoid.

Working at the front of the intake manifold, squeeze the crankcase vent hose (red arrows) release tabs and pull them off the intake manifold.
Figure 8

Working at the front of the intake manifold, squeeze the crankcase vent hose (red arrows) release tabs and pull them off the intake manifold. Then, rotate the hose toward the wiper cowl to move it out of the way.

Then release the fuel injector harness strip from the fuel injectors and remove it.
Figure 9

Then release the fuel injector harness strip from the fuel injectors and remove it. I find the easiest way to do this is to use a large flathead screwdriver and gently pry up (red arrow) at each fuel injector. This will release the spring clips that hold the electrical harness to the fuel injectors. If stuck, try a swift prying action to detach the connector. Work your way down the injectors lifting the harness housing (blue arrow) while disconnecting the injector harness. Lay the fuel injector harness aside.

Next, remove the four 10mm fuel rail fasteners (red arrows).
Figure 10

Next, remove the four 10mm fuel rail fasteners (red arrows).

Then pull the fuel rail straight up and out of the intake manifold.
Figure 11

Then pull the fuel rail straight up and out of the intake manifold. Be careful not to damage a fuel injector when removing it. If the O-rings are stuck, you can gently lever (red arrow) the fuel rail up using a large flathead screwdriver. I like to lever between the edge of the valve cover and the fuel rail. Spray lubricant around the O-rings if needed. This will make removing them much easier. If there is dirt in this area, remove it before spraying the lubricant.

When removing the fuel rail, feed the inlet (red arrow) out of the rear of the intake manifold.
Figure 12

When removing the fuel rail, feed the inlet (red arrow) out of the rear of the intake manifold. Note the routing through the wiring harness for reinstalling.

Allow removed fuel rail to drain in a pan (red arrow).
Figure 13

Allow removed fuel rail to drain in a pan (red arrow).

To remove the individual fuel injectors, remove the retaining clip (red arrow) by sliding it off the fuel rail using a flathead screwdriver.
Figure 14

To remove the individual fuel injectors, remove the retaining clip (red arrow) by sliding it off the fuel rail using a flathead screwdriver. Then pull the fuel injector straight out of the fuel rail (inset). When reinstalling the fuel injectors, replace the sealing O-rings and be sure that the retaining clips are properly seated. Press the fuel rail with injectors into the intake manifold until fully seated. Then install the fuel rail fasteners and tighten them. Reassemble the remaining items and check that there are no fuel leaks.

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Page last updated: Tue 4/25/2017 03:12:07 AM