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Discussion Starter · #1 ·
2006 Explorer 4.0 L top end rebuild?!?My truck makes a terrible noise. I was told it could be a broken rocker arm but it drives great. The check engine light is on and the diagnostic told me it鈥檚 running a bit rich. Should I rebuild the top end and howwould it run fine!?馃檧
 

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"Noisy" would seem an understatement. All that banging and racket is causing pieces to come off the rocker arm into the oil. Can't be a good thing.
 
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