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hi guys,i have a question concerning a nissan silvia s14. I was hearing a click sound from my block and i decided to take the plugs off just to see what was going on. Plug #1 was smashed. I then started it without the same plug and a piece of metal came out. I put in a new set of plugs and it idled and revd well but then the sound came back again so i removed plugs and this time plug #1 was not smashed but had some small trases of contact. My qyestion is what can cause this? Any help will be appriciated.
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