930 CIS hose routing questions

[confused]

I have a 79 930 and it has some issues so I pulled the motor to do a major service. The car is a 49 state car, type 930/64. Putting it back together now.

I am wondering from where is the Auxiliary Air Valve actuated from, where does the vacuume line go? The manual shows no vacuum connection on a 49 state engine but mine have the nipple.

It also seems that these 49 state cars only get one Thermo Valve on the distributor side. CA cars are showing 2 Thermo Valves with an additional one on the Auxiliary Air Valve. Is the wire harness the same for both engines as I have an additional plug for the second Thermo Valve but there is nothing to plug it in - is this normal?

I had someone at a cars and coffee meet tell me to disconnect the Thermo Valve on the distributor and not use it and you will get more power, I think he was suggesting I set the timing where I want and disconnect the valve - anyone have a comment on that?

Finally I need to pass smog in California, but only pass so that does not mean I can't do a VW trick and change it back so it works better. My original smog pump was seized and the Blow Off Switching Valve was missing entirely. I found a good used eBay smog pump off a later car and a Blow Off Switching Valve (the thing the smog pump pumps the air into) from a 77 turbo. The tube leaving the smog pump is larger than one going into the Blow Off valve - do I have mismatched components or is there a special tube that has 2 different size ends? Or does anyone have old smog pump hoses or parts from a 78/79 930 to help fix this?

Is there anyone in California that is passing the smog test in a 78-79 930? Wondering if my BB Exhaust will pass the test as there is no EGR hookup.

[confused]

Here is the smog pump hoses I am missing. Anyone have some original hoses they can sell me - I like originality

[Ronnie's.930]

Many of your pictures loaded upside down - must have loaded them directly from an Apple device, so a bit hard to read the manual pages, but regardless, the AAV nipple that you are pointing to hooks to one of the same sized ports on the throttle body - any one of them that is available will do as long as it is below the throttle plate (I believe all of them are but am not 100% sure on that from memory).

The thermo valves prohibit distributor vacuum advance until they are in the open position, this creates higher exhaust temps more quickly, and thus aided in passing emissions testing. I've eliminated mine so as to get rid of potential air leaks and to remove needless gadgets that can fail. As far as "getting more power" - nope.

[turbo owner]

Have you given any thought getting the car tagged in Nevada

[puggi]

The early cars don't have vacuum advance, only mechanical. The distributor vacuum can on California cars has two nipples. The inside nipple is for retarding at boost and the outside nipple is for retarding at idle.

The "unvented" thermo valve, connected inline with the distributor, is closed when cold. This blocks vacuum when started cold and the idle rpm should raise to about 1200. Once warmed by the internal resistor this thermo valve opens and lets vacuum through to the distributor, which retards the timing, and idle settles down to 950rpm.

The "vented" thermo valve, inline with the AAV, is open when cold and closed when warm. After initial warmup vacuum doesn't affect the AAV. If you don't have this thermo valve I would just put a vacuum cap over the backside nipple. Cap isn't needed, but if the AAV diaphragm isn't in good shape there could be an air leak.

[confused]

Odd how the pictures show up fine with the iPad but a couple are upside down on the PC. My vacuum port on the throttle body is taken, so I guess that would be where this vacuum T goes. The CA routing shows both AAV running off the same vacuum source but with a Thermo Valve in line. Of course I wonder why the illustration in the manual for 49 state cars is missing that vacuum line.

The cars and coffee guy, I am not really sure what he meant, he was just pointing and did not know the name of anything so he probably did not know what he was talking about. I am still learning all these systems so I am not sure who everything works or interacts with other parts.

There is plenty of info on this forum but when it gets to original stock systems on a 930 you need to dig or ask. There is plenty of make the car go faster talk however. I want to make my car a little better but retain original appearance - all while trying to understand the purpose of all the little parts.

Registering the car in Arizona or Nevada would probably not require smog test, but reg in another state is just a bandaid fix and would be the same hassle as switching an exhaust or doing some similar adjustment to pass smog, then I would have to drive around with an out of state plate but with a CA driver license so if it get pulled over then the cop can give me a fine and force me to register the car in CA anyway so yes I thought about it an no it is not worth it to register in NV.

[confused]

Originally Posted by puggi

The early cars don't have vacuum advance, only mechanical. The distributor vacuum can on California cars has two nipples. The inside nipple is for retarding at boost and the outside nipple is for retarding at idle.

The "unvented" thermo valve, connected inline with the distributor, is closed when cold. This blocks vacuum when started cold and the idle rpm should raise to about 1200. Once warmed by the internal resistor this thermo valve opens and lets vacuum through to the distributor, which retards the timing, and idle settles down to 950rpm.

The "vented" thermo valve, inline with the AAV, is open when cold and closed when warm. After initial warmup vacuum doesn't affect the AAV. If you don't have this thermo valve I would just put a vacuum cap over the backside nipple. Cap isn't needed, but if the AAV diaphragm isn't in good shape there could be an air leak.

Thank you for responding Puggi. Makes sense the thermo valve on the distributor side of the engine is responsible for the high idle on startup and then lowers the idle after a few min. I know this function so well as I used to run a dealership with many of these CIS 911s so I would wonder what is wrong with the car if it did not do that function. You want to keep this valve in place on a original appearing street car. My car only has the one nipple on the distributor.

If the second thermo valve opens the AAV - what is it that the AAV does? There are two of them - one in front of the intake manifold and one in back. My car is a 49 state car so it is not equipped with this device but I still have an AAV.

Looks like I found the used smog pump hoses from someone who chimed in - thank you TT

[confused]

here is a picture of my motor currently, and the car BEFORE any work was done

[turbotoo]

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