I've got a 240D with about 300k miles on it. Number one cylinder has low compression.... something like a hundred pounds. But, when I run a leak down test on it, it tests identically to the other three cylinders. I've been trying to think of what could cause this. I thought maybe the intake lobe was worn off, but that wasn't the case. Yesterday a friend suggested that the problem could be a worn valve guide on the intake. He thinks the valve is not seating properly during cranking, but manages to seal when the leak down test is applied.

Has anyone seen this problem?

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Richard

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