Good afternoon all,

I have a 2001 5.9, with 137k miles on it. Bought it from the original owner last year, and installed a Fass, new VP, and some 75 hp injectors.

shortly after installing the new VP and injectors, I started noticing this “tick” noise at idle. Sounds like an exhaust leak/air leak more than a metallic tick, but I cannot find it to save my life. It’s louder at idle in park, and then when I shift to drive it’s still there, but not as loud.
ive done a lash adjustment, sprayed the exhaust system with soapy water, with no findings other than a pinhole towards the rear of the exhaust (not where the sound is). I’ve also taken all the new injectors out, checked them, put new o rings on everything, and then reinstalled, and it’s still making the same noise.

im at a loss. Truck drive like normal, it’s just one of those things that will drive me nuts if I don’t figure it out. Let me know what y’all think from the video. You can hear it more on the passenger side.

 

So when you rev engine up, does the sound increase, decrease or no noticeable change?

 

I have revved it a few times in park, and the sound increases in speed until about 1000 rpm or so, and then it either goes away or the engine nose drowns it out.