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Ecoboost spark plugs


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Can anyone tell me why spark plugs keeps cracking after a while, this one is about 100 miles, second set of plugs, first original Ford, now NGK, same problem.



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These plugs are notorious for this, ive had it many times, believe it or not its caused when removing and refitting them, for some reason these are extremely fragile compared to any other plugs.

Just a slight nip up is needed only when tightening and dont use a electric ratchet when removing them as it seems to break them everytime. 

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