Quote:
Originally Posted by Porschedave
I agree with the above comments regarding air leaks.
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Charles,
I fought with bucking, rising idle when warm and a non-stop putt-putt mini backfire from the exhaust for over a year in the 2010 time frame. Ran great but not quite right.
I finally (e.g., exhaust gasket changing among other stuff) took a can of starting fluid to the base of the intake runners and found the leak to be the #4 runner base gasket at the head.
This was after I had pulled the engine for a trans rebuild and resealed what I could on the engine while I waited. I think I just did not tighten the runners correctly.
Mind you, I later did the comprehensive boyt911sc pressure test to find air leaks and found a few minor ones. But leaks at the base of the intake runners are stinkers. They are so close to the action.