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Throttle Body Cleaning and Replacement
 
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Pelican Technical Article:

Throttle Body Cleaning and Replacement

Steve Vernon

Time:

3 hours3 hrs

Tab:

$3 to $1,700

Talent:

**

Tools:

8mm, 10mm socket, 5mm Allen, flathead screwdriver

Applicable Models:

Mercedes-Benz 300CE (1990-93)
Mercedes-Benz 300E (1990-93)
Mercedes-Benz 300TE (1989-92)
Mercedes-Benz E320 (1994-95)

Parts Required:

New throttle body and gasket

Hot Tip:

Do not drop anything in the intake manifold

Performance Gain:

Smoother-running engine

Complementary Modification:

New fuel filter

The throttle body or ETA (electronic throttle actuator) on the Mercedes W124 like any other vehicle can get very dirty over time and affect the flow or air through it. It is a good idea to check the condition of your throttle body and clean it as needed.

You will need to remove the resonance valve before removing the throttle body. Please see our article on resonance valve removal for additional assistance.

Separate the wiring harness for the throttle body by pivoting back the clip (red arrow) and pulling the plug from the mount (yellow arrow).
Figure 1

Separate the wiring harness for the throttle body by pivoting back the clip (red arrow) and pulling the plug from the mount (yellow arrow).

Remove the two 10mm nuts holding the throttle body section of the wiring to the engine mount (red arrows).
Figure 2

Remove the two 10mm nuts holding the throttle body section of the wiring to the engine mount (red arrows).

The throttle wiring harness wraps around the throttle body.
Figure 3

The throttle wiring harness wraps around the throttle body. It makes the next few steps a lot easier if you remove the cable (red arrow) from around the throttle and hang it outside of the manifold. This will give you more room to remove the 8mm hose clamp holding the bellows to the ETA (yellow arrow, two shown).

With the lower hose clamp loosened you can remove the rubber bellows (red arrow).
Figure 4

With the lower hose clamp loosened you can remove the rubber bellows (red arrow). The bellows can become old, hard and brittle over the years and removing can damage it in certain cases. The bellows pulls straight off the throttle body but may need a little force to remove.

Disconnect the small vacuum line from the body (red arrow).
Figure 5

Disconnect the small vacuum line from the body (red arrow). Disconnect the ball link on the throttle linkage (yellow arrow); it should just pry off with a screwdriver.

Remove the small throttle return spring from the rear of the throttle body (red arrow).
Figure 6

Remove the small throttle return spring from the rear of the throttle body (red arrow).

In this photo you can see the disconnected vacuum line (yellow arrow) and the linkage (green arrow).
Figure 7

In this photo you can see the disconnected vacuum line (yellow arrow) and the linkage (green arrow). The four 5mm Allen bolts can get impacted with dirt and grime. Make sure to clean these out before removing. You do NOT want to strip these bolts (red arrows). Clean out and remove the bolts.

With the bolts removed turn the throttle body on its side and remove it from between the intake runners (red arrow).
Figure 8

With the bolts removed turn the throttle body on its side and remove it from between the intake runners (red arrow).

Clean all the old gasket from the surface of the intake manifold (red arrow).
Figure 9

Clean all the old gasket from the surface of the intake manifold (red arrow).

The exterior of the throttle body may get dirty but the important part to clean is the interior walls and butterfly valve (red arrow).
Figure 10

The exterior of the throttle body may get dirty but the important part to clean is the interior walls and butterfly valve (red arrow). Use carb cleaner and give the throttle body a good cleaning. Installation is the reverse of removal.


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Comments and Suggestions:
Martin Comments: Were cam I gind a second hand air body throttle in working condition. for Merc 230E 124. 1991 model please.
0728426063
November 4, 2016
  Followup from the Pelican Staff: Try ebay. - Nick at Pelican Parts  
infb Comments: Thanks great write up .. Did it in 1 hr and 1/2
October 16, 2016
  Followup from the Pelican Staff: Thanks for the feedback. Glad we could help.
- Nick at Pelican Parts
 
ANDRES Comments: Hello. I have a 1995 E280 and the only problem that it has is that when accelerating at high rpms or trying to do the kickoff, the rpms stop going up at about 4500 rpms. It happens most of the time but sometimes it goes all the way up to the 6400 rpm limit without stopping. I have been researching a lot and some people tell me to change de pump relay. Others tell me that I should clean the Throtle Body. What would you suggest? Do you think any of these two options could be the cause? Is it possible that my car has an rpm limiter since it is a european version? Thanks for your help.
June 16, 2016
  Followup from the Pelican Staff: Is this when warm or cold? If when cold, it may be normal.Otherwise check the DME for fault codes, you may have something prohibiting acceleration. - Nick at Pelican Parts  
Alli Comments: We dropped the first wire that is pointed in yellow arrow in the first picture in dirty water and the throttle of the car started to act weird. Can someone tell me where does that wire gets its power from and does this problem come from something else? Sorry for bad English.
March 2, 2016
  Followup from the Pelican Staff: I think that is part of the main engine harness.
I would grab a repair manual. It will have the wiring.

Give our parts specialists a call at 1-888-280-7799. - Nick at Pelican Parts
 
gianMD Comments: How come there are no 230E W124 included in the "applicable models"?
January 27, 2016
  Followup from the Pelican Staff: I don't know. I would assume it isn't an exact match. Can you confirm the procedure is the same? - Nick at Pelican Parts  
Mel Comments: I have an E320 1996 Mercedes, and Im recieving an error code telling me my throttle body needs to be replaced, which is causing my check engine light to go off. I found a used one from a dismantling facility, but my question is what tools are needed to actually install my new throttle body and replace the old one. I've heard that it needs to be synchronized to my cars computer by a machine, others have told me it doesnt need to be synched. If it does, what kind of machine is it and how much do these replacements usually cost? Any information is helpful, thanks
November 10, 2015
  Followup from the Pelican Staff: Yes, you will need to program the new throttle housing the engine computer. - Nick at Pelican Parts  
RE Comments: I'm about at my wits end. My wife has a 94 E320 that begun to have acceleration problems. Took it to a benz shop who put a OBD on it and said it was the throttle body that need replacing. I removed the TB and sent to a repair shop in Ala. I installed the remanufactured TB and the same problem exist, no acceleration or sluggish acceleration. I order a OBD 1 from amazon and will attempt to read the code myself to find the problem. The possible codes that keeps coming to mind is the electronic accelerator, and or idle speed control. Any suggestion? Thanks
October 1, 2015
  Followup from the Pelican Staff: The throttle motor may be faulty. What is the fault P-code number? I may be able to offer more insight. - Nick at Pelican Parts  
Peter Comments: re my 1994 E 280 Mercedes, How do i know if the throttle body needs replacing, If I purchase a second hand one, how do I see if it works before installation
October 24, 2014
  Followup from the Pelican Staff: I don't know of way to test used ones. You will need to test the one on your vehicle using a scan tool. Then check that the signals going to it are correct, using s DVOM or labscope. - Nick at Pelican Parts  

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