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knocking is probably a rocker but might be a rod, sounds like its time for a master rebuild kit First check if the motor pulley. Located at the lowest part of the engine, when the v-belt runs. check if this is not loose. For poor compression, check timing on the car an a possiblilty for new spark plugs

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Q: Knocking noise in the engine of your 82 Mazda 323 low compression poor idle anyone any idea what could be wrong?
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