PaulCarrera

Just wondering if anyone knows what this is on my 84 euro S2. It is mounted on the right hand side under the fuel injector rail at the rear of the engine. The reason I ask is that the large hose towards the centre of the engine is suspect and wondering if this is why my idle is so low. Another hose from it goes to the air filter housing. I think it is the vacuum limiter but not sure

Guy

It's for the air pump. Switches from air pump pumping air into the heads or into the aircleaner.

PaulCarrera

Thanks for the reply
Just reading up and it appears a lot of people actually delete this (decel valve) is this the same part?. The air pump has been disconnected already so am I right in thinking this is doing nothing anyway

Guy

This is not the decel valve although many people removing the air pump and associated plumbing. I would keep whatever you remove allowing the next owner to put back on if desired

PaulCarrera

Yes I will keep everything thing removed, so just to be clear I can delete this because my air pump is disconnected and I then need to plug the air filter housing and the 2 holes left in the heads by removing the pipes. Bring a euro car there are no cats so no line to them as I believe there would be on a us car

hlee96

Yes. I have done the same mods on my euro s cis engine. Roger sells the metal plugs for them. Saves some weight too when all the parts to the air pump system are removed.

Randy V

It hasn't been operational since the actuating vacuum line was removed.

PaulCarrera

I have removed all the lines and hoses so now I need to plug the heads, I'm thinking of using sump plugs with crush washers the thread appears to be 16 x 1.5 so readily available here. I'm also going to physically remove the air pump and canister but it's pretty tight and wonder how much stuff I have to remove to get it out......anyone done this?

Daniel5691

Hope you're doing well !
A quick question, please...

When you removed your air pump, did you have to re-route any belts?
It seems as if when my engine were all in mostly one piece that I had the impression that removing the air pump meant removing a pulley which changed the length of belt needed for the radiator fan ?

PaulCarrera

Yes I used a belt that from memory was something around 20" or 21" this depends on the pulley size you have and I think this is based on whether or not you have the rear a/c. This belt just goes from the main crank pulley to the fan although I will probably replace this with an electric fan at some stage.
I have got the pump and filter canister out, the canister was a bitch and the pump needs the sheet metal shield removed and then it can be manipulated out. Well worth doing I think quite a bit of weight and a lot more room to do other stuff and looks cleaner

granprixweiss928

On a 16V this valve does not feed the heads.

it feeds the air injection into the exhaust ahead of the cat, to improve the efficiency of the cat when cold, or back into the intake when hot. It always gets air from the pump. Its switched by a temperature activated vacuum switch located on the passenger side (LHD) head.

PaulCarrera

My car is a euro and it doesn't have cats as it left the factory and it does indeed feed the heads as I have just removed the line which goes to both heads. Not sure what it does but definitely there. There are only 2 lines out 1 to the heads and the other to the air filter

The Forgotten On

In the euro cars this takes the place of the cold start valve plumbing into the heads, but instead leads to the exhaust valve instead of the intake valve's port.

So if anyone runs euro heads on a US engine, be aware of this otherwise you are just adding afterburners...

Guy

This holds true for all CIS cars as well, just to clarify

PaulCarrera

The pump has been disconnected for a while and I can't notice any difference to the way the car runs, what is the purpose on my car although I think I understand why it is on the us cars