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Pelican Technical Article:

M54 6 Cylinder Engine Throttle Housing Replacement

Nick Czerula

Time:

3 hours3 hrs

Tab:

$300

Talent:

*****

Tools:

Set of sockets T40 Torx socket, flathead, Phillips screwdrivers

Applicable Models:

X3 E83 (2004-06)
X3 E83 facelift (N/A-A)

Parts Required:

Throttle housing, throttle housing gasket, TPS, IACV, gaskets, O-rings

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.

The digital motor electronics (DME) engine management system in BMW E83 X3 vehicles with an M54 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 throttle opening to the throttle housing at the intake manifold. A faulty throttle housing can cause a number of problems for the engine, from a check engine light to a rough or surging idle. Before you condemn your throttle housing, 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. On electronic throttle vehicles, inspect the throttle housing electrical connector condition; the pins have a tendency to lose tension. The best way to check pin tension is with a pin fit kit. However this may not be available to you so you can visually inspect the pins and see if they are spread open or bent.

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 leave your vehicle information.

A faulty throttle housing (body) (red arrow) can cause a number of problems for the engine, from a check engine light to a rough or surging idle.
Figure 1

A faulty throttle housing (body) (red arrow) can cause a number of problems for the engine, from a check engine light to a rough or surging idle. Before you condemn your throttle housing, 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. On electronic throttle vehicles, inspect the throttle housing electrical connector condition; the pins have a tendency to lose tension. The best way to check pin tension is with a pin fit kit. However this may not be available to you so you can visually inspect the pins and see if they are spread open or bent. Disconnect the negative (-) battery cable. See our tech article on battery connection notes. Remove the DISA valve. See our tech article on DISA valve replacing.

Next, disconnect the idle air valve electrical connector.
Figure 2

Next, disconnect the idle air valve electrical connector. Press the wire release tab and pull it straight off (red arrow).

Working at the throttle housing, remove the two 10mm nuts (red arrows) and bolt (green arrow) from the wiring harness junction.
Figure 3

Working at the throttle housing, remove the two 10mm nuts (red arrows) and bolt (green arrow) from the wiring harness junction.

Working below the throttle housing, push the throttle housing wiring harness up (red arrow) out of the holder.
Figure 4

Working below the throttle housing, push the throttle housing wiring harness up (red arrow) out of the holder.

Pull the wiring harness junction off the intake manifold as far as it will go (red arrow).
Figure 5

Pull the wiring harness junction off the intake manifold as far as it will go (red arrow). Remove the idle air valve T40 Torx fasteners (blue arrows).

Then pull the idle valve out of the intake manifold and remove it.
Figure 6

Then pull the idle valve out of the intake manifold and remove it. Depending on how long the valve has been in the vehicle, it may be stuck to the rubber sealing grommet it mounts in. If this is the case, gently work the valve side to side as you pull it out. Inspect the sealing grommet (red arrow) for the valve, replace if dry or cracked.

Next, disconnect the throttle housing electrical connector by pressing the release tab (red arrow) and pulling it off the housing.
Figure 7

Next, disconnect the throttle housing electrical connector by pressing the release tab (red arrow) and pulling it off the housing. If the connector is stuck, use a small pick (green arrow) to release the tab as you pull the connector off. Be careful using this technique, if the connector is damaged, the harness will have to be replaced.

Remove the four 10mm throttle housing fasteners (red arrows).
Figure 8

Remove the four 10mm throttle housing fasteners (red arrows).

Remove the throttle housing from your engine.
Figure 9

Remove the throttle housing from your engine. To install the throttle housing is to do the reverse of the removal directions. Remember to replace the throttle housing sealing O-ring (red arrow). Throttle housing adaptation: 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 03:07:41 AM