560 SEL need vacuum help! - PeachParts Mercedes-Benz Forum

LandYaghtLover · #1 01-11-2012, 02:47 PM

I need a little help.

I think I have a couple vacuum lines crossed. I am trying to figure out why I have no vacuum to my EZL module (another thread).

Based on a what I have been told, and can find online, it should always have vacuum and that vacuum is relative to load.

I have attached the diagrams. Its shows what appears to be a direct vacuum line to the EZL from intake manifold. However, diagrams and real world appearance are two different things.

So I am wondering if anyone has pictures or can identify line colors and where they exactly go.

What I have now is several lines that go under the intake at the front. So where they terminate is not obvious. Another problem is that the lines appear to have been replaced, repair. For example the EZL line goes from the EZL in a opaque line, then is joined to a bright green line with what might be a yellow stripe. From there is it fitted into a rubber hose under the intake. I can only see maybe an inch or two of that soft rubber hose. A couple other lines have soft rubber connectors on them also. Either factory, or what I think were breaks that were repaired.

Another item is the EGR. I have disabled it, but the vacuum lines goes to a thermo valve. There is no vacuum amplifier in the chain as the diagrams show. Maybe I dont have one in 91, but if I am suppose to I have no clue where it went.

So any help describing exactly where the lines should terminate on each end would be great.

I guess worst case I have to remove the fuel distributor to access the lines under the intake and see what the heck is going on.

LandYaghtLover · #2 01-11-2012, 04:57 PM

Okay, I found that removing the air cleaner actually makes it pretty easy to see the terminating points of the lines. I could not reach them to remove if needed. But they are there and connected.

I found that if I rev the engine, I get momentary vacuum at the EZL. Is brief and doe not hold when holding RPM.

There is no vacuum amp on my car (90). Not sure if it ever had one. I doubt it. This port (purple line at throttle body) is capped with a closed black tube.

The red line on my car and the orange line appear to be swapped at the manifold side.

The orange line goes directly to the EZL module. No thermo valve, check valve, etc. Just a direct line.

The red line I think is the vertical port on the intake manifold itself. On my car this line is the black tube with white line. Its larger than the rest and goes direct to the purge valve.

So it seems these are swapped. But this seems like it would be hard to accidentally do. Also the lines do not seem to "fit". The large black line with white stripe used for purge seems to big to be used for the EZL and it seems too large to be attach to the throttle body.

So could anyone verify the purge line? Is it a larger black line with white stripe? Pretty sure that is correct, but does yours terminate on top the manifold or appear to feed from under the intake and close to the TB?