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  #1  
Old 10-10-2006, 11:50 PM
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Found a secret door!!! (Shhhhh....)

While working under the dash on the passenger side, pulling a new wire for an auxiliary power outlet (aka lighter socket) -- but that's another story -- I discovered a Secret Door in the passenger's kick panel. For all the times I've lain on the floor, wiring speakers and such, I never noticed this thing before.

As the picture shows, behind 'Door Number One' is a black box, some kind of electronic thing, I suppose, and a round thing that says "EGR" on it. Well, we all know what EGR means but what are these two things? Are they unique to the 1985 model W123 diesels?

Jeremy

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Found a secret door!!! (Shhhhh....)-egr_4768.jpg  
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Old 10-11-2006, 12:01 AM
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Looks like the idle adjuster on the later cars. Can't be though, afaik the 617 never had electronic idle control.
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  #3  
Old 10-11-2006, 12:09 AM
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In the 123 series that location and item is 85 only. Remember to remember you have it as I believe the tach feeds through it as well. Might not hurt to examine the archives for the other functions or if you get a chance to look at 1985 service information.
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Old 10-11-2006, 12:22 AM
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Yep, no such secret panel on the W126...not on mine anyways.
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Old 10-11-2006, 12:23 AM
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That is the egr computer, but it also operates the tach. The pins on mine were green and badly corroded. Something else behind it, I don't remember what though.....
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  #6  
Old 10-11-2006, 12:24 AM
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He's got a CA model 85 300D. Crazy emissions stuff on that car.
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  #7  
Old 10-11-2006, 12:43 AM
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Quote:
Originally Posted by barry123400 View Post
In the 123 series that location and item is 85 only. Remember to remember you have it as I believe the tach feeds through it as well. Might not hurt to examine the archives for the other functions or if you get a chance to look at 1985 service information.
One correction... It also appeared on the 1984 California 300d. The '84 Federals were the same as the '82-'83.



Quote:
Originally Posted by turbodiesel View Post
He's got a CA model 85 300D. Crazy emissions stuff on that car.
The '85 Federal also had the computer control stuff..... It's same setup as the '84 California.
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  #8  
Old 10-11-2006, 06:11 AM
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Mine doesn't have it (83 Federal)
What does the egr do?
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  #9  
Old 10-11-2006, 07:55 AM
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Quote:
Originally Posted by cavaliers16 View Post
Mine doesn't have it (83 Federal)
What does the egr do?
What it actually does:

*Decreases engine power / speed
*Obliterates MPG
*More not-so-great stuff

What it's supposed to do:

*Decrease emissions

What everybody does:

*Stick a BB in the EGR line to stop it from being used.
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Old 10-11-2006, 08:36 AM
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Besides the tachometer being dependant on the EGR electrics, isn't the speed sensor for the AC compressor also dependant on the EGR and that if there is a problem, the ACC will not function?
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Old 10-11-2006, 08:36 AM
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gasp! I thought that those bbs were in your exhaust all the time and they tend to clog up your lines BTW i work at napa and if someone comes in asking for a "test pipe" or "some pipe to replace my cat with" or "a drain plug to plug my egr" I can't sell it to them. If you don't tell me what it is for, i can sell it. BS gov :fork_off:
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  #12  
Old 10-11-2006, 09:43 AM
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i need that door, mine was missing.
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  #13  
Old 10-11-2006, 10:53 AM
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I have the exact same car as you, even to the interior color.

I don't seem to have that EGR device. I'll have to doublecheck. A P.O. used it for installing a satellite radio tuner.
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  #14  
Old 10-11-2006, 08:11 PM
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Quote:
Originally Posted by cavaliers16 View Post
Mine doesn't have it (83 Federal)
What does the egr do?
The EGR valve recirculates part of the exhaust gases (hence the name) back into the intake. The intent is to give unburned fuel in the exhaust a second chance to be burned, in an effort to reduce pollution. While is does do that, after a fashion, it is an "add-on" rather than a "designed-in" and does not work that well while having significant negative effects, as Zerohour3k has said.

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970
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