Thank you. I thought I was never going to find that again. It looks like #5 will be the one I need to do. Could i be getting this much of a vacuum leak from my hoses? They dont feel rotten or hardened. the connections are sealed well and tight. Maybe theres a diffuse leak through the full length of the hose? I know im not having a carb base gasket leak. The transmission vacuum line doesnt leak. Also, can my timing affect my optimum a/f ratio?
Timing and other ignition problems can absolutely mimic carb issues. Have you checked timing - idle and all in numbers and have you checked vacuum readings?
You may be activating the vacuum advance, which "peps up" performance. No vacuum to diaphragm, no advance, try driving it with advance disconnected. .
I looked up specs on 1970 200 distributor - has 7 degrees vac adv / 16 deg mechanical adv / 6 deg book setting at idle. Like all factory settings, these are lower than the engine will like for a little more power.
I've timed it, with a timing light of course, with the vacuum advance disconnected and the line plugged.
Well with some tinkering i found out that theres no difference whether or not i have the manifold line connected to the distributor. As if i just have the line open
Plug the manifold hose and leave the inner hose disconnected for now. The retard is not needed for proper engine function. Do you have a vacuum hand pump to see if the advance is working properly? Make sure that hose goes to carb vacuum. Check with the timing light to see if you're getting proper advance.
I did as you said and now it seems like the vacuum advance is working. Could the lean condition be caused by not having a muffler? I just have a motorcycle megaphone tip to make it deeper-sounding so its not so raspy. The original muffler wasnt doing much. It was essentially junk.
I don't think the missing muffler would do anything if the pipes are still on there. You are running an air cleaner - yes? Did you put a vacuum gauge on it yet? (manifold vacuum)
The shop manual make no reference to any adjustment on the dual diaphragm advance. I consider a vacuum gauge to be an essential tool for anyone that wants to work on these older engines. There is a great deal you can tell about your engines condition. I suggest a trip to your local parts house Saturday to pick one up. They don't cost much. They might even have one in their customer loaner tools.
I've solved my a/f mixture problem. I'm still having symptoms of my vacuum advance not functioning. Where could I find a new vacuum advance unit? I would prefer to just replace this dual diaphragm one with a single diaphram.
Lots of them on ebay. Both Ford and aftermarket. They are easy to swap. If you are not concerned about originality switching to a single is the way to go. So what did it turn out to be for the carb issue?
