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04 F150 4.6 knockin...
 
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04 F150 4.6 knocking noise

  

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Hi Scotty, my truck just started making a knocking noise, I sent you an email with a video but wasn't sure you checked emails anymore. I figured a worn wrist pin because it doesn't have cam phasers installed til 2009 and later, but after looking at it again I noticed the fan hesitate and wondered if the compressor could be making that noise? Definitely a knocking noise..


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You should take the serpentine belt off to confirm your diagnosis. 


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