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At 08:25 AM 8/31/2006, you wrote:
regroup and return to the basics rather than the exotics.
I agree. I think something must have been overlooked.
Did you duplicate the cold cylinder test on the "good" mag?
The Left (lower) mag/plugs operate in a leaner mixture than the
upper/right. If the left doesn't exhibit the problem then intake
leaks are likely not the issue.
Try wiring the left mag to the upper plugs and vice-versa.
When operating in the right mag, if the #4 cylinder is not firing is
should be VERY rough and I'd expect more than a 200 RPM drop.
John Cooper, A&P
Skyport Services
PO Box 249
4996 Delaware Tnpk
Rensselaerville, NY 12147
518 797-3064
Fax 518 797-3865
www.skyportservices.net
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