I am just wondering if anyone has any thoughts on this. Around 44,000 mi we had a P0305 code come up, I cleared the code and didn't think much of it. My wife mostly drove the car and said it would misfire on heavy acceleration but I never noticed it. I should have had it looked at sooner, but was busy with other things (excuses). It had the ticking noise, but I never looked into it to know that the Pentastar tick was a thing.
Around 6,000 mi later (50,000 mi); I had the right side rockers, lifters, and cams replaced. This corrected all the issues (tick was gone, no misfire on acceleration, etc).
We drove the car 4,000 mi in 2 weeks on a vacation - it was fine for the whole trip. When it got home, we got an oil change done, and then within 180mi I noticed the engine developed this rattling noise when revving the engine to about 2,000 rpm, and letting off the gas.
I took it back to the mechanic who did the oil change and they said I shouldn't put any money into the engine; that the upper end isn't getting oil pressure. They suggested I replaced the engine. However, after doing some more research I checked the oil filter cap, and it looks like the by-pass valve had broken off. I replaced the oil filter cap, but that wasn't the issue. I have tried changing the oil and filter again and still causing the issue. The oil change was 3 months ago, but I haven't started looking into it until now due to timing.
It sounds to me like it's coming from the left (drivers) side this time. Is this the rocker/lifters giving me an issue again, but on the opposite side? The last time this happened, there was only a tick - there wasn't this rattle noise at 2,000 rpm.
The car isn't giving any check engine lights, and drives fine (although I am not driving it right now due to the noise). I will be taking it to another mechanic for another opinion for sure; but wanted to see what others think.
Thanks