Quote:
Originally Posted by carpetvan
see if you can feel suction or pressure in the hole. if no suction or pressure you have a broken connecting rod. if you do feel suction or pressure you have a valve problem.
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I don't know who told you this, but it is not an accurate diagnostic method. Whether a piston is not moving or a valve is stuck, you will not get compression (or suction) in either case. As long as there is no visible damage to the rockers, the head has to come off to know exactly what the problem is, there are no shortcuts.