EGR blocking plate kit - Page 13 - PeachParts Mercedes-Benz Forum

Hit Man X · #**181** 04-18-2005, 11:50 PM

Comparing an '84 Fed vs '84 Cali/'85 Fed side by side... most of that crap pictured by the spillover tank is emission control stuff.

The vac lines run around and around to it. It's crazy.

ck42 · #**182** 04-19-2005, 12:42 PM

If I could, I'd like to be to just completely remove that device over there by the tank....but of course want to be sure I don't screw with anything else.

Quick rundown here: Vacuum sections

Transmission related
ALDA related
EGR/ARV related

Are there any other areas that have vacuum lines plumbed to them?
The ALDA lines I can totally isolate no problem.
The transmission section I've NEVER messed with so I have no idea what lines are involved there.

and the mystery meat....the EGR/ARV crap.

Chris
'85 300SD

Hit Man X · #**183** 04-19-2005, 01:44 PM

Well, good news is removing the EGR is no problem and plugging that hose.

But the ARV is directly linked to emission for sure? So I can plug it off the turbo and back to it's valve? If so, I'll do that too.

Then the rest of the ol' emission bits can hang out until further investigation.

dhbecker · #**184** 04-19-2005, 02:10 PM

Here's a question for those of you who have installed your kit from Brian after removing the egr valve & corrugated tube: since I have accomplished this on my 240D engine, with custom stainless steel cap on the exhaust manifold (see my previous thread on this) I get a faint "percolating" sound when accelerating - which disappears when I ease back on the pedal. This also occurred after I had first installed the copper disc & sealant that Brian provided, before changing to the steel cap without sealant. The sound definitely was not there before. Very puzzling, and my only speculation is exhaust pressure against the manifold cap on acceleration causing this percolating sound ? Previously, with the exhaust being blocked at the solid egr valve = no such sound; now with a relatively thin metal plate blocking the exhaust = this sound? I'm wondering if anyone else has experienced this? Or can the percolating sound be attributed to other causes?

ck42 · #**185** 04-19-2005, 02:23 PM

The thinner metal plate and the exhaust pressure were exactly what I was thinking. With the thick stainless plate in the kit, the noise that you're hearing is probably just totally muffled.

Chris
'85 300SD

Brian Carlton · #**186** 04-19-2005, 02:36 PM

Quote:

Originally Posted by dhbecker

.............. I get a faint "percolating" sound when accelerating - which disappears when I ease back on the pedal. This also occurred after I had first installed the copper disc & sealant that Brian provided, before changing to the steel cap without sealant. The sound definitely was not there before. Very puzzling, and my only speculation is exhaust pressure against the manifold cap on acceleration causing this percolating sound ?

That's quite bizarre. Can you describe the "percolating" in any more descriptive terms? I realize that it's difficult. However, I'm having trouble visualizing the exhaust gas pulses causing a resonance of the copper disc to the point where you would be able to hear it vibrating................but.............it's not out of the question.

The fact that the copper plate on the sealant exhibits the exact same behavior as the silver soldered plate is not a good sign. The installation is far more rigid with the silver soldered plate, and, therefore, the resonance characteristics of that installation will differ from the resonance characteristics of the copper plate sitting against the sealant.

To have the same sound with two different types of installation is puzzling.

ck42 · #**187** 04-19-2005, 08:43 PM

I've got about half a dozen pix of various points with vacuum lines that I'd like to figure out.
So, the first being now.

In this one, there is the usual yellow line going from the crossover switch to the ALDA, but what is that other line coming from the ALDA?

Oh.....and what is that white/yellowish device directly to the right of the ALDA? It has two lines going to it also.

Chris
'85 300SD

ck42 · #**188** 04-19-2005, 08:51 PM

Next one...back to the EGR/ARV device.

Didn't realize it before but there's another switch device located down below the main one.

So...now that the EGR and ARV lines are accounted for, what are the two black lines, the white/brown stripe line, and the white/blue line for?

One of the black lines is going to the top device and the other black line to the smaller device underneath. At the other end of the lines, they join together at a 'Y' connector.

ck42 · #**189** 04-19-2005, 09:00 PM

...and here's where the two black lines, white/brown and white/blue lines end up on the other side of the engine bay.

You can see starting at the right side of the pix where the two black lines come out of the sheath and then join together only then to be plumbed into a plastic filter.

Brian Carlton · #**190** 04-19-2005, 09:13 PM

Quote:

Originally Posted by ck42

I've got about half a dozen pix of various points with vacuum lines that I'd like to figure out.
So, the first being now.

In this one, there is the usual yellow line going from the crossover switch to the ALDA, but what is that other line coming from the ALDA?

Oh.....and what is that white/yellowish device directly to the right of the ALDA? It has two lines going to it also.

Chris
'85 300SD

OK, I'm guessing because I don't have the '85:

The second line coming off the ALDA probably goes over to the "vacuum transducer" which is the big blue thing on the driver's fender. Correct?

The white/yellowish device is the "vacuum control valve". This is what regulates transmission vacuum depending on position of the pedal.

I am somewhat familiar with the third photo because it is similar to the SDL. But that filter is unique to the SD. Need a vacuum diagram.

ck42 · #**191** 04-19-2005, 10:19 PM

Quote:

Originally Posted by Brian Carlton

OK, I'm guessing because I don't have the '85:

The second line coming off the ALDA probably goes over to the "vacuum transducer" which is the big blue thing on the driver's fender. Correct?

The white/yellowish device is the "vacuum control valve". This is what regulates transmission vacuum depending on position of the pedal.

I am somewhat familiar with the third photo because it is similar to the SDL. But that filter is unique to the SD. Need a vacuum diagram.

Yes, the second clear looking line coming off the ALDA is going to the bottom portion of the blue flying saucer.

Ok on the tranny control valve...always wondered where that thing was.

Chris
'85 300SD

Hit Man X · #**192** 04-20-2005, 04:17 PM

Quote:

Originally Posted by ck42

Yes, the second clear looking line coming off the ALDA is going to the bottom portion of the blue flying saucer.

Ok on the tranny control valve...always wondered where that thing was.

Chris
'85 300SD

They always looked similar to hockey pucks or those Hostess Ding-Dongs to me.

So I guess we'll leave the blue vac device for the trans in place?

At least we're getting close to getting this vac sorted out...

ck42 · #**193** 04-20-2005, 09:00 PM

Just HAD to pass this link on!!

Chris
'85 300SD

Hit Man X · #**194** 04-21-2005, 12:04 PM

Quote:

Originally Posted by ck42

Just HAD to pass this link on!!

Chris
'85 300SD

- Is the blue hockey puck actually a GOOD piece?! Seems that way. I will reread after I digest.

Brian Carlton · #**195** 04-21-2005, 12:08 PM

Quote:

Originally Posted by Hit Man X

- Is the blue hockey puck actually a GOOD piece?! Seems that way. I will reread after I digest.

Definitely. That's the vacuum "transducer" and it provides a relatively steady signal to the transmission. Much better than the signal that comes from the vacuum control valve.