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Alright. Did some more homework. Finding information is not proving to be very easy as I am having to piece it together from reply's, other threads, various books, etc.
Based on now understanding that EGR stands for Exhaust Gas Recirculation I'm guessing no issues with vacuum/fluids per my question above. I'm not yet certain but it sounds like EGR, EGR Valve, EGR Filter are all pretty much synonymous.
Per a google search (about.com) I learned this about what the EGR does: emission control device that sits between the exhaust and intake manifolds on a vehicle engine and regulates the amount of spent exhaust gas that is mixed into the intake stream. Its purpose is to cool combustion chamber temperatures to the threshold that reduces the formation of nitrogen oxides (NOx). The higher the combustion temps, the higher the formation of NOx.
I pulled out my 101 Projects book and 911 Performance handbook and while I can't find anything in the 101 book I found the following in the perf handbook.
p. 72 states: Focus of 1975: California Emissions...."first year of the abominable thermal reactors and EGR (Exhaust Gas Recirculation) for California cars."
Sounds like in later years this setup made it's way to other US Porsche models as well (personal hypothesis) and not just CA cars since I dont' believe my car was specifically a CA car. It came into the USA via the Pacific Northwest and was delivered to a collector in Seattle area. I purchased it from him in '98 and have the original window sticker and dealer delivery info. It was one of the last cars delivered in Dec of 1979. I don't have the info in front of me but I believe it came in via Canada (Vancouver I believe).
OK...all caught up on the thread. I'll keep up with both threads as I continue on this project. I'm sure one day down the road there will be someone else like me that will find this useful. We'll see if the trend continues but so far I am having a blast working on my car.
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