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N62 8 Cylinder Throttle Body Replacement
 
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Pelican Technical Article:

N62 8 Cylinder Throttle Body Replacement

Nick Czerula

Time:

3 hours3 hrs

Tab:

$200

Talent:

****

Tools:

10mm socket, flat head screwdriver

Applicable Models:

BMW 545i Sedan (2004-05)
BMW 550i Sedan (2006-10)

Parts Required:

Throttle body, sealing O-ring

Hot Tip:

Work with a cool engine

Performance Gain:

Remedy fault codes and restore engine performance

Complementary Modification:

Replace air filter

The digital motor electronics (DME) engine management system in BMW E60 vehicles with the 8-cylinder (N62 or N62 TU) 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.

While the engine is running, the throttle is kept wide open; actual intake air volume is controlled using the Valvetronic, system which varies valve lift. However, a faulty throttle body can cause a number of problems, from a check engine light to a rough or surging idle. If you have a fault code for throttle housing potentiometer or motor drive, check the electrical connections and system data via a scan tool. 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 breather hoses. If a breather hose cracks or fails, the air leak can cause a rough idle or engine stalling. You may have to remove the throttle housing when servicing other components. If you do have to do this, be sure to replace the sealing O-ring.

In this article, I'll go over the steps involved with replacing the throttle body on BMW E60 models with an 8-cylinder engine. Be sure to work with a cool engine.

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.

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

The throttle body is located at the front of the engine (green arrow).
Figure 1

The throttle body is located at the front of the engine (green arrow).

Working at the intake air duct, pull the vacuum line (green arrow) off the air duct.
Figure 2

Working at the intake air duct, pull the vacuum line (green arrow) off the air duct.

Using a flathead screwdriver, loosen both the intake air duct hose clamps (green arrows).
Figure 3

Using a flathead screwdriver, loosen both the intake air duct hose clamps (green arrows).

Once the clamps are loose, pull the air duct off the throttle housing, then pull it off the intake air box.
Figure 4

Once the clamps are loose, pull the air duct off the throttle housing, then pull it off the intake air box. Place the duct aside.

Working at the throttle body, disconnect the electrical connector by pressing the plastic release tab (green arrow) and pulling it off.
Figure 5

Working at the throttle body, disconnect the electrical connector by pressing the plastic release tab (green arrow) and pulling it off. Our subject vehicle was a bit dirty under the hood, so the connector would not release. I used a flathead screwdriver (yellow arrow) to lever the locking tab (green arrow) while pulling it off the throttle housing.

Remove the four 10mm throttle body fasteners (green arrows).
Figure 6

Remove the four 10mm throttle body fasteners (green arrows). There is a plastic wiring harness mounting bracket (yellow arrow). This will come off with the fastener. Note the position for reinstallation.

Once you have removed the throttle body fasteners, remove the throttle body from the engine.
Figure 7

Once you have removed the throttle body fasteners, remove the throttle body from the engine.

Be sure to replace the throttle body sealing O-ring (green arrow).
Figure 8

Be sure to replace the throttle body sealing O-ring (green arrow). Install the throttle housing in the reverse order of its removal. Be sure the electrical connector is properly engaged. Listen for an audible click when reconnecting.




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Comments and Suggestions:
Roniek2n Comments: Hello gents and ladies. I'm having a question regarding figure 2 where you remove the vacuum line. Can you tell me what is the purpose of this line? During alternator gasket job I snapped it and was wondering if it could cause engine running lean.
Regards.
May 10, 2016
  Followup from the Pelican Staff: The vacuum line runs to the crankcase breather valves, going by memory. it can certainly cause a lean condition at idle.

- Nick at Pelican Parts
 

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Page last updated: Fri 12/9/2016 02:23:24 AM