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jjbunn

Please ID this Pierburg valve/whatnot

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This is mounted on the bulkhead in the engine compartment on my '73 2002:

8564018334_0f876cd946_b.jpg

It has a red/white and a brown wire going to it. There are two tubes, that are not connected, labelled S and U. At the top is small detachable cap, under which is a mesh filter and an air hole. It is made by Pierburg.

I'm assuming this is smog-related, but a search has drawn a blank.

Thanks!

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On a '76 there were 3 of those ding-a-lings nailed to the firewall.

Something to do with emissions.

post-21933-13667670319169_thumb.jpg

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8564018334_0f876cd946_b.jpg

Classic Vacuum 2-Way Valve (also 3-Way Valves)

for Emission Control

It switches vacuum on and off to distributor

advance, retard, AIR injection diverter valve, EGR

valve, idle increase... you can sell this to any 1960's

1970's Mercedes-Benz owner also to get more money

on E-Bay!

i'd say yours had BLACK paint on the cap on top

which is not a removable-cap - but an air vent.

(Black cap for vacuum advance)

depending on the Emission Control System that

it controlled they came in RED,WHITE,BLACK,SILVER tops

for schematic i.d. .

8564018334_0f876cd946_b.jpg

now - if you have 2 vacuum hosed just hanging loose with

vacuum leaking out then you probably have a lousy

running motor.

Pierburg also make the fine mechanical fuel pump

and other automotive devices.

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On a '76 there were 3 of those ding-a-lings nailed to the firewall.

Something to do with emissions.

'75's also have 3 of those ding-a-lings (1 white-capped, 1 red-capped, and 1 black-capped) whereas the '76 49-state versions only had 2 ding-a-lings (1 white-capped and 1 black-capped). The '76 49-state version is distinguished from other '75 and '76 versions by its lack of a thermal reactor so I believe a thermal reactor requires a red-capped ding-a-ling.

The color of the cap related to the original color of the hoses used to connect the ding-a-ling to the car's emissions controls and manifold. I seem to recall that they had different part numbers; maybe the different part numbers specified the cap color or maybe each of the ding-a-lings had different specs.

Take a look at RealOEM or equivalent for your VIN: these items probably are classified under intake manifold with other emissions controls. A '73 has/had an air pump, so I'm not shocked to see a ding-a-ling. (Of course, my '70 had an air pump and I don't recall a ding-a-ling; but I was much younger and more focused on my Stebro!)

Steve

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Thanks, chaps!

Yes, it has remnants of black paint on the cap. I have numerous bits of disconnected emissions stuff on this car, as well as disconnected seat belt warning wiring etc..

The vacuum advance is connected directly to the carb/intake, but maybe at one point it was connected via this valve.

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