Hi All,

I'm continuing to attempt to put back together several components of an 87 560sl (car was inherited from estate of mother in law...long, sad story).

Of the many issues I'm trying to track down, one is a high idle at all times (cold or hot). I suspect a vacuum leak because the last person working on the car was attempting to fix the AC and I've found a few pieces of vacuum hoses disconnected. Also, the "Economy" gauge never moves, it just sits at the right side of the gauge.

I've attached a couple photos of some lines that appear to be disconnected on the drivers side engine compartment next to the brake booster as well as a vacuum check valve I found in a box of spare parts.

Does anyone know where this part goes? The part number on it is 123-000-0278 and it seems to be a general 3-way check valve. Does it attach where the hanging vacuum lines are, or is something else supposed to go there?

I want to sell this thing, I'd just like to get as much back together as I can.

Thanks!

Attached Thumbnails

   

G:

The grey plastic vacuum lines go into the three-way rubber connector; the two purple (w/white stripe?) plastic lines go into the two parallel hoses on the check valve.
Grey is the engine intake manifold side of the valve.

Thanks Frank! I hooked those up and the Economy gauge seems to work now, but it now goes all the way to left and the high idle is still there. I will keep searching. Thanks again.

Just a follow-up on the high-idle issue. It ended up being a faulty OVP. Super easy fix and interestingly, its replacement also eliminated a hard starting issue completely. Fires right up now and idles as it should.

For vacuum diagrams put this in to Google search engine --- 7ZAP Then choose .