Edited after realizing I hadn't read all pages on this thread:
Everyone posting on this thread to date is obviously much better informed than I am, so please excuse my ignorance, but is the issue that this installation addresses related to the fumes I smell in my cabin when I cold start in the morning? For the most part, the fumes go away after a few minutes, but on my way down from a ski resort in a snowstorm last weekend (starting at 10,000 ft), they were much worse.
A few things that might or might not be related:
1. I have an oily film accumulating where indicted here
2. About 18 months ago I addressed the swirl motor issue with the large modified hose (presumably what is referred to as the elephant hose with the red nozzle) that redirects oily airflow so it doesn't gum up the swirl valve motor.
3. Recently replaced the glow plug control module and all glow plugs, having gone for quite a while with some very rough starts.
4. I also recently replaced the shifter module, but it seems very unlikely that's related.
Thanks for any suggestions any of you may have, or feel free to redirect me to a less technical thread where I can get an education : )