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

10

Asked by Apr 09, 2015 at 09:43 PM about the 1998 Honda Civic Coupe EX

Question type: Maintenance & Repair

5 Answers

64,315

If you do not here a tap or knock,it probably is just the firing of the plug that you are feeling.

10

It dose make a knocking noise and I don't fell it on the other spark plugs only that one

1 out of 1 people think this is helpful.
64,315

If you here a knock,then it will be the valves, in the head,may need a rebiuld.

10

Ok thanks

65,845

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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