Collapsed lifter?

[tomb0118]

I noticed a knocking noise developed recently that is consistent with the engine rpms, I first thought it was a rod knock, but the noise only happens when the engine is warm, which makes me believe that it could be a collapsed lifter, any ideas? It's a 1999 ram 1500 with the 5.2L

 

[ouch1011]

Could be a collapsed lifter, but I wouldn't classify a collapsed lifter sound as a knock. More of a tap. Hard to really describe with words. You could always pull the rocker covers off and check to see if any of the rockers seem loose.

 

[Johnnymac2k6]

I had a collapsed lifter on a 3.9 dakota. (basically a 318 minus 2 cylinders) i pulled the valve covers and everything still seemed tight.
I added a bottle of the lucas oil stabilizer, and it slowly dissipated. Its the only "snake oil" to this day i have ever had work, or do anything. That little truck is still on the road. And it sounded like it was coming apart.
something worth trying...

 

[SYKRAMMAN]

Not sure if your truck has a purge regulator/valve, but I thought for sure I had busted something as it was consistent with rpm’s, I opened the hood and traced the knocking to the purge valve. I was nervous that my engine was going, it was that loud. Bought new one and it’s even louder, so took that one back and bought mopar part, =silence.