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Super Moderator
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Welcome to ROF.
How long have you owned it? You don’t sound as frustrated as I would. It seems like your next step would be to get an opinion from a mechanic.
 

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4.0 L engines are also known to have noisy lifters
 
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Premium Member
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How loud is the knock? My '03 has tapped pretty bad for the last 100k, I believe it's the crank touching the brace on the mains. I mean, a knock is a knock, but you'd swear mine is on death's door and it keeps chugging along.
 

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Just gave 2 away a couple of months ago. Did 5.3l V8 swaps and never looked back.
 
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