Hi Nate,
This is very helpful. After I cleaned off some of the hoses I noticed that they are not all black (duh). This is my first diesel with an automatic and acc. Previous were 240s with manual trans and manual cc controls. I uploaded 2 pictures of the hoses that are plugged off in the photos section "79 Vacuum hoses disconnected/plugged".
You are right, there is no EGR on this car. It's been too cold to go outside the past week to do any work on it. Weatherman threatening warmer weather next week. Maybe I can get out there and make more sense of this then.
thanks,
David
--- In diesel_mercedes@yahoogroups.com, "Nate" wrote:
>
>
> David ;
>
> A 1979 Model has no EGR valve .
>
> The firewall has yellow tubes for the central locking , green tube for the HVAC and brown for the keyswitch , this shuts the engine off .
>
> As your engine halts rapidly , I'm betting you have minimal vauum leaks .
>
> The black tubes are for venting , they go through the firewall and end under the dashboard , open to suck air .
>
> there _may_ be a plastic vacuum resivoir behind the left front fender , aft of the wheel where you can't see it ~ mine both had a black tube and didn't hold vacuum so I capped them off and only used the trunk vacuum resivoir for the central locking .
>
> I went through this same thing with both my old '78 & '80 Diesel Coupes , there might be some vacuum diagram pictures in the files section of the home page .
>
> You should get about 20" vacuum +/- @ idle .
>
> -Nate
> David wrote :
> >
> > Hi Chuck,
> >
> > Thanks for asking for more info. Under glowplugs 2-3 I found:
> > Mercedes Benz
> > 617 011 03 01
> > 11D-79
> >
> > Under the coolant hose coming out at cyl 5 there are the letters AB
> >
> > Not sure if that is what you were looking for, if not, steer me in the right direction.
> >
> > It's a US model and no EGR to be found anywhere. Could have been removed. This one has no vacuum lines going to the transmission. Has linkage from the throttle going over the valve cover to the right side under the manifolds back to the trans on the right side. It shifts fine through the gears. The vacuum pump is sucking but it doesn't feel very strong. I'll get a reading on it tomorrow to see what it's pulling. The engine also shuts off right away so that part seems to be working fine.
> >
> > Coming off the main vacuum line from the pump to brake booster I found the following:
> > First line splits. one line to a three way connector and the other a red line that is plugged.
> >
> > The three way splits off to a line going into the firewall on the center, the left has a one to a two hose valve with black line and the other plugged off. The other side has another 1 to two hose valve with a green line and a red/white line. There are two yellow lines coming out of the firewall into a three way fitting that has the third part plugged.
> >
> > Hope this helps id some of this. Door locks and ACC non functional so I'm guessing that some of the ones plugged off go to those? The car runs pretty well but the brake boost feels a bit weak. It does have a new booster and seal ring at the master cyl.
> >
> > thanks,
> > David
> >
> >
>
