Quote:
Originally Posted by McGalliard
So presumably something somewhere else was either adjusted or has failed, leading to an inappropriate correction at this idle screw. I'm guessing the list of possibilities is too long. Does that include vacuum leaks? Or will I likely be hunting down a part in need of a rebuild or replacement?
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Yes, it look's like.
Vacuum leaks - no. As the screw gives with 4 turns double the amount of bypass air to let the engine idling. Even when the mixture seems to be ok, but as you wrote that the engine still smokes. This can be caused by rich mixture as well as burned oil which is common for a flatsix engine after sitting long time. But also detoriated gas may cause this. Depends on the color of the smoke. How does the spark plugs look (color, wet or dry, dirty with black deposits etc.)? How does the fuels smell?
There may be several things to sort, but in the beginning the most important components of the CIS, WUR & FD must be proved okay. So we're back at the beginning.
As I still don't know if your measurings of SP and CP were correct - only when they we're proved correct it makes sense to move ahead to the next steps.
You wrote about your last test results of the CP. Basically they don't look too bad I would suggest to let the FD checked / overhauled by a CIS specialist as they're mostly dead after decades, even if they have been driven or not. They contain rubber sealings, metal sealings and are made of cast iron which can also corrode. The tools you need for overhauling them are highly precise machines you cannot buy at Home Mart...not to mention the experience. Expecially when you aren't experienced with these cars. I got mine overhauled by a specialist and he charged 800bucks 5 years ago...highly satisfied with the work, as the FD is the central component delivering the right amount of fuel to any cylinder under any operating condition which fundamental for a good running car...when some cylinders got too few fuel they run too hot. On an aircooled engine this may cause damages relatively quickly...
But before tearing the FD out of the car I would ask you to do one more thing:
When does your fuel pump start running? When switching ignition on?