Quote:
Originally Posted by DanEC
No. 3 goes back to my original question - is the idle mixture too rich? I guess I can experiment with leaning it down and see if the rpm jump lessens when I uncap the vacuum port.
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If you pull the cap off the manifold vacuum, and you hear it sucking clean air through the little tube, and the RPM jumps up, then "yes" your mixture was not at the optimal level for idling, it was a little rich -- but maybe your engine might like a little rich mixture -- I don't know. Now remember, my car doesn't have a vacuum advance but, obviously, if you're changing your timing by pulling the vacuum feed off the distributor that runs to your manifold vacuum then that would have to be taken in to account. If I had a vac advance distributor, I would just isolate that out of the equation by plugging it off while I adjusted the carb. I guess they didn't have exhaust gas analyzers at the Ford dealerships in 1963? Anyway, this is not a tough test to perform. And if it doesn't work for you, just go back to whatever method it was that you were using before. Of course, you should perform all your testing and adjusting with the air cleaner on.