When I push down on the spark plug wire on the engine I fell a thump like something is hitting the spark plug what would cause this its a 98 Honda civic ex
If you do not here a tap or knock,it probably is just the firing of the plug that you are feeling.
It dose make a knocking noise and I don't fell it on the other spark plugs only that one
If you here a knock,then it will be the valves, in the head,may need a rebiuld.
It's possible that the reach on that one plug is too long. Meaning that the part that screws into the head is too long and the top of the piston is hitting the bottom of the spark plug. Remove the spark plug and inspect the tip (electrode) for damage. If it's banged up, that's what's going on. Replace the plug with a correct one. HTH. -Jim
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