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S54 6 Cylinder Engine Idle Control Valve Replacement
 
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Pelican Technical Article:

S54 6 Cylinder Engine Idle Control Valve 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 (2006-08)

Parts Required:

Idle control valve

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 characteristic of the one-piece plastic shell is 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.

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.

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 the manifold 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 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 characteristic of the one-piece plastic shell is 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 (red arrow points to area of valve with intake installed). 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 idle control valve (red arrow) and the connecting hoses (green arrows) to the intake manifold and air tube.
Figure 2

With the manifold removed, you have clear view of the idle control valve (red arrow) and the connecting hoses (green arrows) to the intake manifold and air tube.

Start by removing the upper hose clamp using diagonal pliers (red arrows).
Figure 3

Start by removing the upper hose clamp using diagonal pliers (red arrows). Grab the clamp and twist until it opens (green arrow).

Repeat the previous step for the lower hose clamp (red arrow).
Figure 4

Repeat the previous step for the lower hose clamp (red arrow). Using diagonal pliers (red arrows) grab the clamp and twist until it opens.

Start by removing the top hose (red arrow).
Figure 5

Start by removing the top hose (red arrow). The lower hose (green arrow) can stay attached until later.

Working at the valve, disconnect the second electrical connector by pressing the wire retainer (red arrow) and pulling it straight off.
Figure 6

Working at the valve, disconnect the second electrical connector by pressing the wire retainer (red arrow) and pulling it straight off.

Next, loosen the lower 10mm fastener about three turns (green arrow).
Figure 7

Next, loosen the lower 10mm fastener about three turns (green arrow). Then, remove the two 10mm upper fasteners (red arrows).

Remove the valve from the engine.
Figure 8

Remove the valve from the engine.

Place the valve on a workbench.
Figure 9

Place the valve on a workbench. Remove the 10mm fastener you loosened earlier. Then lever the valve clamp out of the small tab (red arrow) on the mount. Be careful not to bend the tab. Then open the mount and remove the valve (green arrow).

Depending on how you purchase a new valve, you may have to swap the mount and the rubber insulator over (green arrows).
Figure 10

Depending on how you purchase a new valve, you may have to swap the mount and the rubber insulator over (green arrows). When installing, be sure the arrow on the valve (red arrow) faces in the direction of airflow, up in the case of the S54. When installing, reverse the removal directions. To adapt the valve, 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: Fri 12/9/2016 02:57:16 AM