Picture didn't come through because I didn't post one. :lol:
What I meant by "this" is what you said about the crank pully/harmonic balancer. The rubber deteriorates and allows movement and will "knock".
I can't recall if the tonewheel for the crank sensor is mounted to the inner or the outer part of the balancer, if on the outer, movement could affect engine timing and performance.
Not gonna come right out and say this is definately your problem but it is a very good possibility.
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Today's Featured Article - Hydraulic Basics - Part 2 - by Curtis Von Fange. In the last entry to this series we gave a brief overview of hydraulic system theory, its basic components and how it works. Now lets take a look at some general maintenance tips that will keep our system operating to its fullest potential. The two biggest enemies to a hydraulic system are dirt and water. Dirt can score the insides of cylinders, spool valves and pumps. Wate
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