Quote:
Originally Posted by Jim Brierley
Always give it a compression check at first! Could be anything from a piece of carbon holding a valve partly open to a blown head gasket, to a intake manifold leak. A compression check will tell you if the head needs to come off, or not.
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X2, but wouldn't an leaky Intake cause the motor to run lean, would not cause plugs to be black? If carboned valve open, would only affect 1 cylinder? Just asking, not trying to be picky, arm chair mechanic here trying to learn.