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"Engine knocking" is sometimes cause by cheap gas. Boost up your octane a bit. If you are using 87....Try 93. Thats a simple solution.

You also could be lugging the engine if it makes a knocking noise as you try to accelerate after you shift. Rev it up higher, then shift.

This is the only form of "engine knocking" that I have heard of. My old car use to knock from cheap gas, put in premium, noise was gone. Now, with stickshifts, if I shift too early, sometimes the engine will lug and I will hear a knocking type sound and feel it in the clutch.

It could be something else as well. Im sure the other mods such as Random will have other ideas.

2000 Black Hyundai Elantra GLS
 
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