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Old 08-19-2006, 06:05 PM
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Join Date: Oct 2005
Posts: 13
ETA Cleaning & Wiring Inspection, '94 E420 - M119

I've been having idle problems lately - engine dropping below 500 rpm pretty consistently and even dying a few times. Based on reading this forum and JimF's website, I was thinking that the wiring in my ETA (throttle body) was shot and needed to be rebuilt.

Well, I pulled the ETA out this morning and found the wiring to be in perfect shape after opening the side cover. Even makes me wonder if the throttle body has already been replaced. When I turned the ETA over, however, I found that the underside of the plate was completely caked with carbon - 1/32 to even 1/16 of an inch in places. The intake directly below the ETA was also very caked with carbon. So I cleaned the plate thoroughly and reinstalled. This seems to have cured the idle problems as the idle stays above 500 at all times and throttle response from a stop is greatly improved. We'll see how it does with further driving.

Now for my question. Is this amount of buildup common or does it point to another problem? EGR System? Any insight or recommendations would be appreciated. Before and after pics of the cleaning are attached. First is the top, second is the underside, third is the underside after cleaning.

Many thanks to the forum and JimF for the wealth of information.

Attached Thumbnails
ETA Cleaning & Inspection, '94 E420 - M119-tba-007.jpg   ETA Cleaning & Inspection, '94 E420 - M119-tba-001.jpg   ETA Cleaning & Inspection, '94 E420 - M119-tba-011.jpg  
1994 E420

Last edited by HeathRJ; 08-19-2006 at 06:21 PM.
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Old 02-27-2009, 02:40 AM
dproudfo's Avatar
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Join Date: Jul 2006
Location: Saint Paul, Minnesota
Posts: 139
Follow up...

Is there anyone that knows the answer to this post?
1995 E420
1998 SL500 Sport
2009 E350 Sport
1995 S500 Coupe
1992 500 SEL
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Old 02-27-2009, 08:51 AM
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Join Date: Jan 2003
Location: Matthews, NC
Posts: 1,356
I don't know about this car but I do know that the build up is common on all port fuel injection systems. When I get a car in with idle problems the first thing I do is clean the throttle body. Ford has a sticker on their throttle body's that says "Special coating, DO NOT clean". If they are dirty, I have the choice of "Clean" or "Replace". I clean them. It has helped many,many times. The problem is caused by engine blow-by traveling up the vent hose to the air cleaner side of the intake system. You can have the same problem on the CIS systems at both the air sensor plate in the CIS and at the throttle body down under the CIS. There is nothing wrong with the system, it is just a design flaw (my opion) in most gas engines.


84 500 SEL (307,xxx miles)
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