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S54 6 Cylinder Engine Throttle Body Replacement
 
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Pelican Technical Article:

S54 6 Cylinder Engine Throttle Body Replacement

Nick Czerula

Time:

5 hours5 hrs

Tab:

$300

Talent:

*****

Tools:

Set of sockets, flathead, Phillips screwdrivers, boot clamp pliers

Applicable Models:

BMW E46 M3 Coupe/Conv (2006)
BMW Z4 Coupe/Conv (2006)

Parts Required:

Throttle body, actuator rods, intake manifold clamps, seals

Hot Tip:

Work with a cool engine

Performance Gain:

Car will run well

Complementary Modification:

Inspect the intake air ducts and replace if necessary. Replace the air filter.

On the 6-cylinder S54 engine installed in BMW Z4 vehicles, the molded plastic intake manifold or intake plenum mounts between the six individual throttle bodies and the intake air housing. The manifold is designed for maximum volume required for the S54 engine. Depending on the model the S54 is installed in, it will vary slightly, due to engine compartment restrictions. The flow characteristics of the one-piece plastic shell are enhanced by internal funneling cones to direct the intake air to the throttle housings.

The plenum is attached to the throttle housings by rubber sleeves. The S54 uses six individual throttle housings operated by one electronic throttle actuator (EDR). For low engine speed (low load) and idling, intake air is provided by an idle control valve. The valve regulates airflow through an external air distribution pipe to the individual throttle housings.

The digital motor electronics (DME) engine management system in BMW Z4 vehicles with S54 6-cylinder engine is designed with a drive-by-wire throttle. There is no throttle cable connecting the accelerator pedal to the throttle housing. Instead, potentiometers in the accelerator pedal module (PWG) communicate pedal position directly to the engine control module (ECM). Two separate signals, one signaling pedal position and the other indicating rate of pedal movement, communicate driver demand on the system.

Based on pedal position and movement, the ECM communicates the throttle opening to the throttle bodies at the intake manifold via the EDR. A faulty throttle body actuator can cause a number of problems for the engine, from a check engine light to a rough or surging idle. Before you condemn your EDR, be sure to inspect all the intake air ducts. They should be well-sealed and free from cracks or tears. Check the function of your crankcase breather valve and inspect all the breather hoses. If a breather hose cracks or fails, the air leak can cause a rough idle or engine stalling. If you have a throttle position sensor (TPS) fault, be sure to confirm it is the EDR TPS or the throttle body TPS as they each use one.

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 you're 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. Do you have questions or want to add to the article? Leave a comment below. When leaving a comment, please leave your vehicle information.

When removing the throttle bodies, do not loosen the connecting rail set screws, unless you have access to a throttle body-synchronizing tool set. As once loosened, they need to be properly timed for opening. The throttle bodies are also cylinder specific; do not mix them up and if replacing, be sure to get one for the correct cylinder.

Disconnect the negative (-) battery cable. See our tech article on battery connection notes.

Remove the intake manifold. See our tech article on intake manifold removing.

On the 6-cylinder S54 engine installed in BMW Z4 vehicles, the molded plastic intake manifold or intake plenum (green arrow) mounts between the six individual throttle bodies and the intake air housing.
Figure 1

On the 6-cylinder S54 engine installed in BMW Z4 vehicles, the molded plastic intake manifold or intake plenum (green arrow) mounts between the six individual throttle bodies and the intake air housing. The manifold is designed for maximum volume required for the S54 engine. Depending on the model the S54 is installed in, it will vary slightly, due to engine compartment restrictions. The flow characteristics of the one-piece plastic shell are enhanced by internal funneling cones to direct the intake air to the throttle housings. The plenum is attached to the throttle housings by rubber sleeves (red arrows). The S54 uses six individual throttle housings (blue arrows) operated by one electronic throttle actuator (EDR). For low engine speed (low load) and idling, intake air is provided by an idle control valve. The valve regulates airflow through an external air distribution pipe to the individual throttle housings.

With the manifold removed, you have clear view of the EDR (red arrow) and the connecting rod (green arrows) to the throttle bodies.
Figure 2

With the manifold removed, you have clear view of the EDR (red arrow) and the connecting rod (green arrows) to the throttle bodies.

Start by rotating the lower connection of the rod off the EDR (red arrow).
Figure 3

Start by rotating the lower connection of the rod off the EDR (red arrow).

Next, working at the idle air control valve, remove the two 10mm nuts (red arrows).
Figure 4

Next, working at the idle air control valve, remove the two 10mm nuts (red arrows). Then remove the valve (green arrow) from the engine and lay it aside.

Then, disconnect the throttle body electrical connector by pressing the wire retainer (green arrow) and pulling it straight off.
Figure 5

Then, disconnect the throttle body electrical connector by pressing the wire retainer (green arrow) and pulling it straight off.

Each throttle body is held on by two fasteners - one at the top (red arrow) and one at the bottom (green arrow).
Figure 6

Each throttle body is held on by two fasteners - one at the top (red arrow) and one at the bottom (green arrow). The bottom fasteners can be removed with a universal 11mm socket and an extension. The top fasteners have to be loosened using an open-end wrench, then unscrewed and removed by hand. Keep a magnet nearby to help catch it when removed, as they can fall behind the throttle bodies and get lost.

Working under the cylinder six throttle body, remove the three 10mm wiring harness bracket nuts (red arrows).
Figure 7

Working under the cylinder six throttle body, remove the three 10mm wiring harness bracket nuts (red arrows). Then pull the bracket down and away from the throttle body (green arrow).

Remove the lower throttle body fasteners (red arrow).
Figure 8

Remove the lower throttle body fasteners (red arrow). Unscrew the fasteners by hand once loose if space is restricted (inset).

The top fasteners have to be loosened using an open-end wrench (red arrow), then unscrewed and removed by hand.
Figure 9

The top fasteners have to be loosened using an open-end wrench (red arrow), then unscrewed and removed by hand. Keep a magnet nearby to help catch it when removed, as they can fall behind the throttle bodies and get lost.

The top fasteners for cylinder 5 and 6 throttle bodies are hard to access.
Figure 10

The top fasteners for cylinder 5 and 6 throttle bodies are hard to access. Pull the harness away from the cylinder head and hold it in place with a screwdriver (green arrow). This will allow access to the fasteners (red arrows).

Remove the throttle bodies as an assembly from the cylinder head (red arrows).
Figure 11

Remove the throttle bodies as an assembly from the cylinder head (red arrows). Use a pick (green arrow) and remove the throttle body sealing O-rings (inset) from the cylinder head. Replace the bodies with new seals.

When removing the throttle bodies, do not loosen the connecting rail set screws (red arrows), unless you have access to a throttle body-synchronizing tool set.
Figure 12

When removing the throttle bodies, do not loosen the connecting rail set screws (red arrows), unless you have access to a throttle body-synchronizing tool set. As once loosened, they need to be properly timed for opening. You can replace the plastic lever connecting rods (green arrow) without tampering with the throttle body sync.

To install the throttle bodies, reverse the removal directions.
Figure 13

To install the throttle bodies, reverse the removal directions. Be sure the dowels (green arrows) in the throttle bodies are seated inside the cylinder head fastener bores before tightening the fasteners. To adapt the EDR, turn the ignition key to the ON position for 10 seconds (do not start engine). Next turn the ignition key to the OFF position for 10 seconds. Start the engine.

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Page last updated: Mon 12/5/2016 02:57:07 AM