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The misfire is what really concerns me, it is very possible the cam is already wiped. if it were me, I'd get a uoa. What valvoline did you use? Do you have factory warranty left? I wouldn't go redline just yet without more info.
It's also not like I fire it and dump it in gear right away, I wait at least 30 seconds or a minute for the rpms to come down and for the oil psi to be 54, which is what I have for full oil pressure, cold.
My 6.4 has done this. Just a handful of times & it only lasts for a couple of seconds. It has been so infrequent I really don't worry about it. It has even blown smoke 3 or 4 times on start ups. Its a 2016 with 60k on it. Most of my Chrysler products that I have owned have made noise upon start up. And I have owned everything from a 2.2 all the way up to this 6.4.
I have had this happen twice in my truck and it went away in a minute or two. I quickly shut the truck off the first time and re started it in hopes it would settle down and it didn't. It was definitely hard to let it run with one lifter clattering that bad until it cleared up. My truck sits a lot so I assumed I have one lifter that bleeds down if the truck happens to be shut off when that particular lifer is on the top of the cam lobe. Hearing that this can happen after starting the truck briefly and shutting of makes sense because I'm pretty sure I had started it for a few minutes to move it and then shut it off when it happened. In any case it has done it twice in the 6 years I've owned it and other than that I have no Hemi tick whatsoever so fingers crossed I won't get it. Noisy hydraulic lifters drive me crazy. If mine ever start to make noise I will replace them as soon as possible
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This is exactly what my truck has done. As you said, it hurt me to let it run hammering like that but it did go away. As I said my observations are that it only happens when I start it to move it out of my shop to wash it (let it idle a minute or two) then shut down, wash, start up, let idle a 30 seconds, move back in, shut down.
The next time I start it, (on 2 occasions now, not everytime) it's done this. I'll have to be more careful about doing that and maybe take it for a run around the block before I pull it back into the shop after the wash. See if that helps.
The first thing you need to do is get rid of that crap Fram filter. They are no good at all. There are many threads for a comparison and it just isn't a good filter. Use the Royal Purple filter most of us use or the SRT filter which is what I use. I have it on my Hellcat and my 2014 R/T truck. They are a higher end filter and work really well.
Most likely was an aerated lifter. It can happen when the engine sits for an extended period of time. Since the lifter is aerated you’re not getting the right amount of lift and it will run rough.
See this every now and then with trucks on the lot, there’s even a star case about it. Basically have to hold the engine at about 2500 rpm for a few minutes till the air gets out of the lifter and then it goes away.
I too have now recently gotten "hemi tick" i think its a oil pressure issue above all.As the truck sits the oil pressure bleeds down thus causing said tick.Watching my gauges as the truck fires up it takes a second or two to show any oil pressure but it climbs fast,this is starting the engine almost as if it has no oil causing the "tick".Once the lifters get enough oil pumped up noise goes away.Sorry for the ramble.Point is there is either an issue with the design of how the oil pick-up works on these hemi`s or the lack there of an oil pressure relief valve strong enough to hold the pressure while the engine isnt running.Ive been asking around about a after market system that could be incorporated into the oiling system of these trucks and supposedly there is something out there that the race market uses.I intend to find out what that is and hopefully try one out,if i find one that works for our hemi`s i will post upThanks for responding TT, I always appreciate your input here. That sounds like what my issue was. I have run the truck since a few times and it's been quiet and run good. Thanks again for the info.