[W126 Coupe] Vacuum Diagram -

[Dick Spellman]

Hi MS J.

See comments below highlighted in blue.

Have fun,

Dick

MS. J wrote:

> First off I hope everyone had a nice turkey day.  I spend some of my 

> vacation days changing filters, and trying to find out why my car has 

> lost a lot of its power.  I got a good look at a lot of the wiring and 

> noticed that my vacuum lines were not attached in 3 places.  One I 

> fixed but the other two have puzzled me some. 

>  

> In the front drivers side, right behind the headlight,  there is a 

> purple/black vacuum line that got disconnected from a vacuum valve 

> that is attached to the fender.  Not sure what that valve is for.  

> This is the vacuum line for euro headlamp elevation control and shoud 

> be plugged into the headlamp bucket vacuum connector next to the 

> electrical harness for the lamps.  The driver's side is the more 

> difficult to see and you may find it easier to move the headlamp 

> forward to get behind there or pewrhaps a mirror and strong light 

> depending on your inclination.

>  

> The second disconnected vacuum line looks like it is coming from the 

> transmission or maybe the rear of the engine.  It is bundled with some 

> other wires at the back firewall but not sure where the other end of 

> this line goes.  I am thinking that maybe this is the reason my car is 

> putting and has a low idle and sometimes shuts off. I am going to take 

> the air filter off and see if something is not connected around the 

> fuel pump area.  This vaccum line should go to a connector directly on 

> the intake manifold and then follow the rear of the engine down over 

> the transmission housing and connect on the driver's side to a vacuum 

> modulator.  The vacuum line to the modulator when disconnected should 

> cause some really hard shifting or litteral banging into gears when 

> accelerating.  The intake leak will cause the most noticable of 

> problems such as npoor power.  The headlamp leak is fed first from the 

> vacuum reserve containers in the driver's fender and then goes to the 

> elevation switch next to your headlamp switch in the dash and then 

> goes out to a tee just to the outside of the fuse box and very close 

> to the brake master cylinder.  From this tee one line goes directly 

> down the driver's fender to driver's headlamp and the other line goes 

> under the electronics and hoses in between the engine and passenger 

> firewalls under the battery tray, etc. and down the passenger fender 

> to the pass headlamp.   All of the lines you have located should be 

> tested for breaks using a MightyVac.  New line of mostly correct color 

> code can be acquired from Jonathan, Rusty or MB and 1 or 2 other 

> sources.  The rubber fittings should be replaced if they are hardened 

> as well.

>  

> So, if anyone out there has a vacuum diagram for 1987 560 SEC, can you 

> send me a link or paper copy, I would greatly appreciate it.  (fax 

> 8182477223)

>  

> Crystal

>  

>  

>

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