Posted by jimg.allentown on September 12, 2014 at 08:29:26 from (98.115.105.174):
In Reply to: stumped on spark issue posted by normmack on September 11, 2014 at 19:02:23:
You need to go back to BASIC ENGINE to diagnose and repair this problem. You are focusing in on fine points that may or may not be the problem. Back in the "old days" a problem like this would warrant the use of a scope, a vacuum gauge, compression tester, dwell meter, and possibly other diagnostic tools.
You mentioned having a bent connecting rod. You also said that the compression on that cylinder was lower. That will cause a loss of output from that cylinder, and will to a lesser extent affect the other cylinder in the pair (cylinders normally operate in pairs - one on compression, the mate on exhaust).
Of course, the bent rod brings up another question. You also stated that the engine was rebuilt some time ago, and the bent rod was noticed then. The question: WHY would ANY competent rebuilder/DIYer not replace an OBVIOUSLY BAD component??????
There are a multitude of problems that can cause the condition you describe. Among them: head gasket leakage ring leakage intake manifold leaks - from gasket or cracked casting Distributor issues spark plug issues And the list goes on to less obvious and more minute things. I suggest going back to basic diagnostics, and taking an orderly and thorough approach. Fixing obvious things like a bent connecting rod would be high on the list.
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