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Hello. What kind of truck is this? What engine?
is it a very powerful knocking, or more of a ticking? does it appear to be coming from the top of the engine?
and you have removed the drive belt to rule out one of the accessories and isolate the noise to somewhere within the engine, correct?
Ok. Without hearing it in person for myself, I can't say for sure, but I am thinking that it's most likely a noisy lifter. I would suggest changing the oil and using some rislone engine treatment.
That's not uncommon of a problem if oil changes aren't performed regularly
Definitely start with the engine treatment then. If that does not resolve the problem, then you may be looking at a timing chain or chain guide issue, but i would most definitely start with the engine treatment before digging into it further. Regular oil changes are very important especially in engines with plastic chain guides. The gritty oil wears the guides down and creates a condition where the chain loses tension, slaps, etc. Hopefully that is not the issue and it's just a sticky noisy lifter.
Hopefully that helps. Let me know how it goes, or if you have any other questions. I'm here to help. Please remember to rate my service as that is the only way we get compensated. Follow up replies are always free even after rating.
That being the case, you may very well be looking at a bad timing chain component. If it's been doing it for a while, then it's probaby not a rod. Connecting rods tend to progress extremely fast
Lack of power?
That helps point to a timing chain issue then. The lack of power would likely be the valve timing off due to the excessive play in the chain. Most likely a failed tensioner or guide.
Was this noise present before that?
Timing chain play usually is louder with higher RPM.
Ok. did you notice the noise shortly after the work was done?
Something may have been re assembled incorrectly. Have you brought it back to them to have them address it?
when you brought it back to them, what was their opinion as to what it was?
He thought an internal engine noise was coming from the muffler? I'm actually wondering, since he thought it was an exhaust issue, if it's a leaking exhaust manifold gasket. That will make a very similar sound to what you describe. That shouldn't cause reduced engine performance though.
Hi.. Just wondering what you found out?