2024 5.3 Ticking

[blanchard7684]

It has pauses as you mention. It isn't a steady rhythm. like tic tic tic tic_____tic___tic____tic tic_______tic tic tic tic_____tic____________________________tic___________tic tic tic_________tic repeat

its 17/32 time not 4/4 lol.

I stehoscoped the high pressure fuel pump. Although that thing is loud and noisy, shockingly so with stehoscope on, the noise is not in same rhythm or quality. And it is constant.

This only occurs in first 5 minutes or so.

I heard most noise in catalytic converter on passenger side. I've heard same sound from driver side as well. The collecter where the cross over connects with driver side exhaust had noise. The heat shield had noise. And I could barely hear it at the exhaust manifold flange. I had nothing on the manifold itself or near the spark plug.

(nothing on the valve cover, timing cover, water pump, oil pan, block, transmission pan, transmission housing, even checked the front shocks, and the brake HCU, and refrigerant a/c collector.)

So the noise got worse as I went toward the catalytic converter, got loudest at the catalytic converter, and subsided downstream of the collecter.

It isn't the exhaust flapper/damper either. That was the first exhaust component I checked.

 

[viven44]

Sounds like exhaust system components expanding/contracting. Usually more obvious on cooldown when engine isn’t running. Usually sounds like something is dripping or ticking.