Hi, I been trying to verify some of the vacuum connections near the firewall and got stuck. There are plenty of diagrams across the web, but none so far, do match what I got underneath the hood.

The part I am tinkering with, is the line that comes off the intake manifold and winds up in a three way splitter.

Two of the three way ports have a two way check valves ea. attached.

There is one SOV for the upshift delay. I believe that the check valve has one port connected to the vacuum reservoir and the second port goes to the SOV. The other side of the SOV goes to the kick-down cable with actuator.

The second port of the three way splitter has another two way check valve attached. This one I believe goes to the in dash vent flaps. From the dash, I believe, is a light green and a white vacuum line coming. There is also a red/grey or red/white line. I have no Idea where this one is coming from and what it does.
But I believe it attaches to the two way check valve.
The white one goes directly into the three way splitter, I assume.



Is there anyone that may have a 95 E320 W124 with the M104.992 in it and can confirm the above?

Or perhaps, someone has the correct vacuum diagram for this model, again I have diagrams out of my ears, but none is matching my vehicle.

Thanks!

__________________
Mostly, I don't know notin, I just know where to look.
I am looking back, to over 30 years in Electronics Design.
Electrons don't care if they move in a car, computer or relay!

95 W124 E320 M104.992 - Because, I love to repair, naaaah!
Over 221,000 Miles
Cheers,
Norbert

there should be a correct diagram on your hood, gray is your source vacuum I believe

Hi and thanks for that input.
I already checked there and strangely it turns out NOT to be what is actually installed. Also, the diagram refers to the emission control, but I am also at the firewall (heating, upshift delay and vacuum modulator, which isn't shown there.

Thanks though!

__________________
Mostly, I don't know notin, I just know where to look.
I am looking back, to over 30 years in Electronics Design.
Electrons don't care if they move in a car, computer or relay!

95 W124 E320 M104.992 - Because, I love to repair, naaaah!
Over 221,000 Miles
Cheers,
Norbert

Got some new parts, two way check valves and some vacuum connetor. I believe what I have drawn in my previous post is correct.
So, I think I am good to go on that one.....

__________________
Mostly, I don't know notin, I just know where to look.
I am looking back, to over 30 years in Electronics Design.
Electrons don't care if they move in a car, computer or relay!

95 W124 E320 M104.992 - Because, I love to repair, naaaah!
Over 221,000 Miles
Cheers,
Norbert

hello,

i have the exact same issue with my e320 1995 w124.

Have you have connected it all up now and assume its working ok

my assumptions are slightly different then your though

gavinbr

Did you check this diagram?

http://www.w124performance.com/service/w124CD1/Program/Engine/LHIS/14-0030.pdf


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I have seen these diagrams.
these are not for the late m104 engine in the W124. it shows the EZL
also it doesn't show the connections under the power brake booster
there is good pic shown under how to "brake boost replacement" but again doesn't show exactly what i have in my car.
you had mentioned the white tube was the flaps, not sure about that??
however the green/yellow one is for air conditioning.

if you have access to mercedes WIS service manual this dwg# is the final version of 104.92 engine in 95 "GF07.51-P-0001-01DA" shows all the vacuum lines for the HFM-SFI engine. but not the connections under the brake booster
If your car from cold delays upshifting then you have the right connections?

your thoughts would be well come
gavinbr

Here are pics of that area from my 1995 E320:






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