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I'm guessing there may have been an intake manifold leak at the #7 cylinder, which caused that one to run way hot.




Have you tried to wrap any logic around that statement?

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My bro-in-law, a retired mechanic, is the one who suggested this. He has seen instances of intake manifold leaks causing such things. A leak at the intake runner for #7, where the manifold meets the head, would allow outside air to be pulled into the cylinder, diluting the a/f mixture, thus leaning out that cylinder, and causing it to run hot. Since none of the other pistons show any obvious signs of either abuse or overheating, this sounded like a logical and reasonable explanation for what might have caused this issue. Does this not sound possible to you? He wasn't saying this is definitely the cause. If you ask five people on this board, you may get five different explanations.

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