3.0 Duramax exhaust system leak test

[ATfore]

Hi everyone, new member here and I put a deposit on an AT4 w/3.0 that should arrive at the dealership in a week or so. Anyway, researching various issues with the engine it seems that most are associated with the exhaust system, whether it’s leaks allowing exhaust gases into the cabin or something related to emission controls. Browsing through the gym-techlink website, when issues with the exhaust system are suspected then GM recommends doing an exhaust system leak test. Some users have reported sysmptoms very shortly after taking delivery.

 

so my question is: does GM perform any type of leak test after final assembly to test integrity of the exhaust system? Is it too much to ask the dealership to perform this test prior to taking delivery?

 

now certainly you can test a system under resting conditions and pass but once you start using the engine and getting it hot and vibrating then mechanically things will become stressed exposing weak points, but assuming it’s not an overly complicated test to perform then it’s cheap assurance that it left the dealership in working order. I would also take the truck for a short drive before asking them to perform the test so it has had some use under its belt. I don’t know, maybe I’m asking for too much. But with as much as this truck costs and potentially being left dead on the side of the road if there are serious issues with the emission controls then it’s really not a big ask. 

[redwngr]

Imho you're overthinking it. Yes it's too much to ask.

If a problem gets a bulletin with solution (like the leak bulletin), it's also implemented at the plant. 

 

The burn off smell that may happen at first few regens isn't a sign of a leak.  

 

 

Enjoy the new truck!