2015 Sierra All Terrain. Loud Pop/tap noise coming from the intake manifold while running and while engine is off

[kgweststar]

 I can provide video. 73000 miles and recently started making a pop noise every 30 seconds to 1 minute no matter whether engine is off or not.  

Edited November 21, 2024 by kgweststar
Year

[UrbanRage]

If you have a video, post it. 

[kgweststar]

https://youtube.com/shorts/na-6hLeh87U?si=jMD9ihfEUYOQ1A2Y 

[kgweststar]

https://youtube.com/shorts/J-w5RJX3gVk?si=BkEVrkcIhEAGv5u8

[kgweststar]

https://youtube.com/shorts/DQpITkx2iwM?si=jGv9pKerlDq7Puik

[kgweststar]

https://youtube.com/shorts/qbKZC7Gnwz8?si=UyqVfG5IpKO0XkRp

[kgweststar]

Hopefully these will help. I can feel the clang/clack sound when touching where the heat shield meets the first driver's side manifold head/chamber. I'm not real savvy, but I know that can't be normal.  Seems to be louder the longer it sits turned off. Does it slower and slower and finally stops an hour after running engine. 

[CamGTP]

That's a odd one. The one picture is just the heat shield bolt broken off, I've seen that before but I wouldn't think that the heatshield would be causing the popping noise but I've been wrong before. That metal is pretty thin and is kinda like tin metal so they can flex and maybe make noise when heat cycles.

 

My other guess would be like a solenoid that is sticking, maybe for like the evap system but this also does it when the vehicle is off.

[UrbanRage]

I have the same sound, and it started after I did the DoD delete. I'm sure the sound comes from the exhaust manifolds' heat shields expanding and contracting with the heat change. I have yet to have the time to loosen or remove them to satisfy my curiosity. I will say that when you have a problem with certain sounds (also known as Misophonia) as I do, it tends to drive me crazy when I'm around the truck after shutting it off, but other than that, I'm not too concerned.

[kgweststar]

12 hours ago, CamGTP said:

That's a odd one. The one picture is just the heat shield bolt broken off, I've seen that before but I wouldn't think that the heatshield would be causing the popping noise but I've been wrong before. That metal is pretty thin and is kinda like tin metal so they can flex and maybe make noise when heat cycles.

 

My other guess would be like a solenoid that is sticking, maybe for like the evap system but this also does it when the vehicle 

I had removed the bolt trying to see if the sound changed in the heat shield, but it still made it after prying it away from the manifold. Picture is taken before I put it all the way back on. I thought about replacing my catalytic converter because I kind of feel it where the donut gasket is that meets the manifold.