Flapping/rattle/tick? while coming to stop (deceleration).

[combat1500]

Hi guys,

 

Just purchased a brand new 2020 AT4 HD. I have the infamouse thumping sound at idle... (barf). 

But confirmed it makes that noise on a few other trucks in person.

 

What I wanted to ask about was a noise that comes here and there, I think if I get in boost, then slow down to a stop (deceleration). Goes away when truck comes to a stop, happens for a few seconds only.

Does not happen all the time... 

 

I had a waste gate rattle on My M5, not sure if this is the wastegate.

 

I wanted to see if anyone else has a similar noise.

BTW took it to the dealer, they told me its normal, and diesels make noise. lol

 

Anyways, thi sis my first diesel, so any feedback would be great!

Edited October 20, 2020 by combat1500

[Njmurvin]

Sorry. I haven't noticed this in my truck. How often does it happen? Maybe a symptom of a regen?

[combat1500]

Doesn't happen often, I notice it when the truck is deceling to a stop. 

Usually after it goes in boost.

 

Doesn't happen every time. Super weird, but I'm thinking it may just be normal.

 

Edited October 20, 2020 by combat1500

[MrGraff]

Can't say I've ever heard this on mine, 18k miles so far.  I'd just crawl under and make sure everything like skid plates are torqued etc.  

[Tomato]

21 hours ago, combat1500 said:

Hi guys,

 

Just purchased a brand new 2020 AT4 HD. I have the infamouse thumping sound at idle... (barf). 

But confirmed it makes that noise on a few other trucks in person.

 

What I wanted to ask about was a noise that comes here and there, I think if I get in boost, then slow down to a stop (deceleration). Goes away when truck comes to a stop, happens for a few seconds only.

Does not happen all the time... 

 

I had a waste gate rattle on My M5, not sure if this is the wastegate.

 

I wanted to see if anyone else has a similar noise.

BTW took it to the dealer, they told me its normal, and diesels make noise. lol

 

Anyways, thi sis my first diesel, so any feedback would be great!

Mine does this as well.  I think I read somewhere early on that it is injector noise - makes sense...

[Pate Services]

I notice something similar when I lay into the gas pedal and let off. As the rpms drop as I decelerate I hear a light ticking noise almost like noisy lifters. I just assume it's the injectors.