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Pelican Technical Article:

Throttle Body Cleaning

Steve Vernon

Time:

1 hour1 hr

Tab:

$20

Talent:

*

Tools:

T30 Torx

Applicable Models:

Mercedes-Benz C350 (2008-14)
Mercedes-Benz GLK350 (2010-14)

Parts Required:

Carb cleaner

Hot Tip:

Use a mirror to see the oil built up

Performance Gain:

Smoother running car

Complementary Modification:

Replace air filters

The throttle bodies and throttle opening valves on the engines tend to build up oil and fine debris inside the opening over time, especially on the right side due to the breather hose being located there. If you allow the build up to grow it can result in blocking the valve partially open and restricting air flow to the engine. Cleaning your throttle body is easy and does not involve you having to remove it from the motor.

You will need to remove the engine covers (red and yellow arrows) and air intake ducts (green arrows) to perform this work.
Figure 1

You will need to remove the engine covers (red and yellow arrows) and air intake ducts (green arrows) to perform this work. Please see our article on engine cover removal for additional assistance.

You next need to remove the MAF (red arrow) and vacuum line (yellow arrow).
Figure 2

You next need to remove the MAF (red arrow) and vacuum line (yellow arrow). Please see our article on MAF sensor replacement for additional information.

Disconnect the breather hose from the rear of the right cylinder head (red arrow).
Figure 3

Disconnect the breather hose from the rear of the right cylinder head (red arrow).

Unclip the two plastic clips on the elbow piece between the MAF and throttle body (red arrow) and remove the elbow and attached hose.
Figure 4

Unclip the two plastic clips on the elbow piece between the MAF and throttle body (red arrow) and remove the elbow and attached hose.

You now have some room to work.
Figure 5

You now have some room to work. Depending on what hand you are better with spray a rag with carb cleaner and reach into the throttle body and clean the opening and valve (red arrow).

The lower right side of the throttle body tends to build up more oil and dirt than the left due to the proximity of the breather hose (red arrow).
Figure 6

The lower right side of the throttle body tends to build up more oil and dirt than the left due to the proximity of the breather hose (red arrow). You can manually open the throttle valve while doing this to clean behind it. It is very difficult to see in the throttle body opening without using a mirror (and more difficult to get a picture of so sorry for the slightly blurry photo). If you do not have a small mirror just keep wiping until the rag comes out clean. After cleaning installation is the reverse of removal.


Comments and Suggestions:
Jason Comments: Story but it doesn’t help on 2013 C250 they’re 1.8 turbo 4cyl. Still not sure where it is the throttle body. However the tutorial is correct for my 2005 c240 6cyl
December 1, 2017
  Followup from the Pelican Staff:
We don't currently have that tech article. If we get a chance to perform the procedure, we will be sure to document it.


I would suggest you grab a repair manual, you should own one. It will have the procedure, special tools and torque specs.

Give our parts specialists a call at 1-888-280-7799.
- Nick at Pelican Parts
 
mohamed Comments: Good
August 10, 2016
  Followup from the Pelican Staff: Great! - Nick at Pelican Parts  

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Page last updated: Tue 12/12/2017 03:00:25 AM