Airflite40

I have removed my air pump and AC compressor. I plan on connecting the CIS as shown in my diagram. Anything I am forgetting?

jtrygstad

Great diagram! Do you have a vacuum connection to a charcoal canister for the fuel expansion closed loop? Mine is missing, but I have a vacuum line that tees off the right side of the vacuum limiter. The other end attaches to what I assume to be a temperature controlled valve on the top of the right cylinder head near the front. Again, the second vacuum line from this valve is missing which I presume originally attached to the charcoal cannister.

Airflite40

Do you have a pic or part number? My mind is completely blank on that one. Thanks.

hupp

John T,

My charcoal canister is evacuated via the suction/ejection nozzle -- the plastic "Y" thing on the driver's side of the intake plenum (between cylander 7 and 8 tubes). A vacuum operated servo is tied into the 5 way vacuum piece located just upstream of the aux air valve. This 5 way piece is also tied into the suction/ejection nozzle. A vacuum line runs from the servo to the back of the throttle body. Here's how it works -- vacuum applied; servo/valve opens; canister is evacuated into the intake and burned in the engine.

I sure wish I had a schematic illustrating the proper arrangement of the CIS vacuum stuff for my '79 US 5-speed. I've seen many illustrations and none of them seem to be consistant. The WSM schematics differ from the Bosch Manual schematics, the Euros differ from the US models, some have EGR some don't, my shark has one vacuum line at the distributer an I've seen some with two; some have "hot start" valves some don't, some have two fuel pumps some don't. Anyone know the rhyme or reason to all the different vacuum arrangements?

Airflite40

I did a search in the WSM for "charcoal" and the only references to it were made in LH-Jetronic diagrams.

Airflite40

I think you are refering to this? I thought I wont need that since it is a diverter valve that connects to the Air pump (G), the left side goes to the air box, and the top side with the smaller check valve goes to the rear of the cyl heads.

jpitman2

My 83 Euro doesnt seem to have a charcoal canister, and I cant right now visualize where the other hose (ie not brake booster) off the Y piece goes to....I have the air pump and diverter valve and feeds to the rear of the heads, and two vacuum hoses (advance and retard) to the distributor. Also U think my big hose from under throttle plate that feeds the extra air valve(for cold start) has a T off it going to the solenoid for lifting idle when AC is on - dohickey hanging off the cross brace. Also have a hot start solenoid on rhs, plumbed into fuel line to WUR. Also have a multi pin electrical connection on the inner side of fuel distributor. In tank pump was to help prevent vapour locks in hot climates - dont have one (UK spec C16), car spent 10 years in Saudi Arabia!
jp 83 Euro S AT 48k

jtrygstad

JP

Your description sounds like my setup. I am just presuming that there once was a charcoal canister. I have a line that runs in a veeeeery circuitous manner from the expansion tank at the rear of the car forward along the right side terminating in the vicinity of the a/c compressor. What I mean about terminating, the end of the hose has been lopped off and dangles about 6 inches from the ground. I'm sure it was meant to connect to something, but not sure what.

jpitman2

Where on the body does the hose from rear expansion tank run? Is it rubber or metal? I cant recall seeing enything except fuel supply/return lines, gearbox cooler and brake lines underneath mine. When I get to removing and cleaning spider and tubes I should be able to see a lot better how things are hooked up in there.
jp 83 Euro S AT 48k

jtrygstad

JP:
From rear to front, it exits the top of the expansion tank located above the right-rear wheel well then crosses over the filler tube turning down then laterally along the rear bumper over to the left side of the battery box. From this area, it crosses diagonally over the top of the transmission back to the right frame rail ahead of the right wheel well. (I think I could have come up with a much shorter direct route!) Much of line is metal tubing so far. At the frame rail, it comes forward bundled with about two or three other lines (probably fuel & return). If I recall, this is rubber hose for this run. It runs forward to the vicinity of the a/c compressor where, on mine, just dangles down toward the ground. The end is open, venting to the atmosphere.

If you have PET, look at 1980 Major Group 2, Sub-Group 01, Illustration 201-00. Items 21 through 26 for the rear end portion. Illustration 201-10 should be the front part of the vent system, but I do not think it applies to the Euro S models of the early 1980s. I don't have any of this stuff.

Borys:
Now back to Borys picture of the diverter valve. I don't have one, do (did) you have one on your 80 Euro S? If mine originally had one, then I've solved the mystery of the vacuum line that tees off the limiter. I think I can safely just eliminate it, and thus, my vacuum arrangement should be identical to your picture, albeit, I routed my line to the WUR around the right side to avoid a kink. BTW, I am still running the air pump - apparently just without the diverter valve.

Airflite40

JP:
I plan on eliminating the A/C thingy that hangs from the crossbar because I eliminated my A/C! I would have needed to convert it to whatever is legal now and reconnect it because the P.O. hacked off the electrical wires that connected to it.

John T:
When I got my Euro, it had the diverter valve pictured above. If you want, you can have mine for free, as lond as you pay for shipping.

Thanks for the input guys!!!

hupp

Airflite,

The air pump diverter valve and the charcoal canister servo/valve are two different things and are unrelated. The charcoal servo is located on the pass. side near the front of the cam tower. A hose runs from the charcoal canister through the fender wall (near the wiper fluid fill neck) to the sevo. A hose runs from the servo to the 5-way vacuum piece located upstream of the aux air valve. Another hose then runs from the 5-way vacuum piece to the suction ejection pump.

Airflite40

Thanks Scott, where can I see it in PET/WSM? Can you explain to me what it does too?

hupp

Airflite,

The WSM does not have much info on the system, but I believe some info can be found in the emissions section (sorry, I don't have my disc with me or I would give you the exact section). The canister servo is very similar to an "HVAC style" servo. The servo is out fitted with a small vacuum port and an inlet and exit port. The carbon canister is outfitted with three ports, one connecting to the gas tank expansion chamber, one connected to the air box and one that is ultimately routed to the intake plenum via the servo. Vacuum is supplied to the servo via tubing routed from a port at the rear of the throttle body to the servo.

Operation:
Vacuum is created at low rpm/idle conditions. The vacuum opens the servo and allows the suction/ejection pump to pull the contents of the canister into the intake plenum (when warm). The ejection pump is...well.. an ejector and creats a pressure drop which creats a suction. This is the black plastic "y" piece between cylinder 7 & 8 intake tubes. When cold, the canister contents flow through the aux air valve -- the outlet of the servo and inlet of the ejection pump tie together at the 5-way plastic piece just upstream of the aux air valve. When the aux air is open the flow path is through the aux air valve.

When at higher rpm the servo is closed and the canister is evacuated through the air box.

Airflite40

Is this the diagram? Which one is it?