VK56, Did you ever find anything out on this? I'm worried I am having the same problem. I purchased a 04 T yesterday with 206k and it sounded like that this morning (my first cold morning start). Sounded very different than when it is warmed up. Sound went away after 6 or 7 minutes of idling in the drive. Do these motors need the timing chains replaced? It just had Jiffy Lube oil change 1k miles ago, but wondering if getting another oil change with synthetic would be a smart idea. It may already have synthetic in it, I have no idea.
Is this the timing chain tensioner?
its a fast clunking sound and i hear it the loudest on cold starts in the morning and night (cooler temps). its not overwelmingly loud but it is noticable (to me). kinda sounds like similar to what the fan does on a cold start if you can imagine. anyways, after i drive it, the sound pretty much goes away. no issue w/ anything. its been making the noise for as long as i can remember but it has always made me uneasy. i let the truck warm all the way up before every drive. it will sometimes lightly clunk the whole time till i drive it, which makes me rule out the common oil pressure explanation (never had btw). i stuck a screwdrive to the bottom of the timing chain cover and it is very prominent there. what do ya think? should i be worried or no?
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