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6-Cylinder Throttle Housing Replacement
 
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Pelican Technical Article:

6-Cylinder Throttle Housing Replacement

Nick Czerula

Time:

2 hours2 hrs

Tab:

$300

Talent:

*****

Tools:

Set of sockets T40 Torx socket, flathead, Phillips screwdrivers

Applicable Models:

Mercedes-Benz E320 (2003-05)

Parts Required:

Throttle housing, throttle housing gasket, MAF sensor seals

Hot Tip:

Work with a cool engine.

Performance Gain:

Car will run well.

Complementary Modification:

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

The throttle housing is an electronic throttle control for your engine. When you accelerate what makes the car go faster? What increases the engine speed and drives the drivetrain down the road? When you step on the gas pedal you open the throttle body to let more air into the engine. On older carbureted engines the increase in airflow would draw more gas out of the carburetor and get the engine to accelerate. Modern engines use sensors to detect airflow and throttle position but a throttle body must still open and allow more air into the engine to accelerate.

A faulty throttle housing can cause a number of problems for your W211 with a 6-cylinder 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 and breather hoses. They should be well sealed and free from cracks or tears. 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.

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. Never work on your vehicle if you feel the task is beyond your ability.

Disconnect the negative (-) battery cable. See our tech article on Battery replacing.

Working at the engine cover (red arrow), pull off the two front air duct hoses (green arrows).
Figure 1

Working at the engine cover (red arrow), pull off the two front air duct hoses (green arrows).

To detach the ducts, pull them straight off the engine cover / air filter housing.
Figure 2

To detach the ducts, pull them straight off the engine cover / air filter housing. Then pull the front of the duct out of the radiator support and remove from the engine. Repeat this step for each duct.

Lift up and remove the front engine cover.
Figure 3

Lift up and remove the front engine cover.

Then, pull the engine cover / air filter housing straight up to remove it.
Figure 4

Then, pull the engine cover / air filter housing straight up to remove it. The cover is held on by four metal clips that grab onto rubber mounts, with the front two shown (red arrows). The rear of the cover has two as well. Once detached, remove the engine cover / air filter housing from the engine.

Working at the rear of the intake manifold, pull the breather hose (red arrows) straight off the duct to remove it.
Figure 5

Working at the rear of the intake manifold, pull the breather hose (red arrows) straight off the duct to remove it.

Working at the right side valve cover, pull the breather hose straight off the breather cover to remove it.
Figure 6

Working at the right side valve cover, pull the breather hose straight off the breather cover to remove it.

Working at the rear of the intake manifold, pull the breather hose junction out of the intake manifold.
Figure 7

Working at the rear of the intake manifold, pull the breather hose junction out of the intake manifold. Pull it straight up to remove it. Once up, pull the hard line (red arrow) out of the breather hose and lay it aside.

Unclip the duct-retaining tab (green arrow).
Figure 8

Unclip the duct-retaining tab (green arrow). Then pull the duct off the throttle housing in the direction of the red arrow and remove it from the engine.

Inspect the seals (red arrows) to be sure they are not worn or damaged.
Figure 9

Inspect the seals (red arrows) to be sure they are not worn or damaged.

If replacing or reinstalling, be sure to line up the tab on the seal (green arrow) with the hole in the duct (red arrow).
Figure 10

If replacing or reinstalling, be sure to line up the tab on the seal (green arrow) with the hole in the duct (red arrow).

Working below the throttle housing, detach the wiring harness from the clip at the bottom of the throttle housing.
Figure 11

Working below the throttle housing, detach the wiring harness from the clip at the bottom of the throttle housing. Then disconnect the electrical connector by squeezing the release tabs (green arrow) and pulling the connector straight off. If the connector will not come off, you can remove it once the throttle housing is removed from the intake manifold.

Remove the four T45 throttle-housing fasteners (green arrows).
Figure 12

Remove the four T45 throttle-housing fasteners (green arrows). The throttle housing is viewed via an inspection mirror. The throttle housing location is indicated by the red arrow.

If you couldn't get the electrical connector off earlier, remove the throttle housing.
Figure 13

If you couldn't get the electrical connector off earlier, remove the throttle housing. Roll it over and remove the electrical connection now by pressing the release tabs (red arrows).

Remove the throttle housing from the engine.
Figure 14

Remove the throttle housing from the engine.

Clean the throttle housing sealing surface (red arrow).
Figure 15

Clean the throttle housing sealing surface (red arrow). Then install the new throttle housing with a new gasket. The remainder of installation steps are the reverse of removal.






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