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Discussion Starter #1 (Edited)
I have a 2008 3.7l that apparently has a cylinder 4 misfire. I changed spark plugs to ngk ones no success. I cleared the code and tried swapping coil packs with cylinder 2 to see if the problem would follow and it still made same noise but I couldn’t get a code out of it. It makes a loud tick/tap noise about every 3 seconds or faster if you rev it. Kind of sounds like you’re tapping aluminum Any ideas?
 

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Sounds like it could be a stuck lifter. Hasn't happened to me, but I know its happened to a few other in the forum.
 
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sounds like a valve lifter has managed to come loose, maybe remove the rocker cover to take a look, but i wouldn't start the engine again, you could cause some real damage
 
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