Four problems related to engine exhaust system have been reported for the 2005 GMC Envoy. The most recently reported issues are listed below.
Exhaust manifold failure. Mechanic says in 25 years he has never seen as many failures as in these models,as it is usualy very rare for them to fail. In researching on line I have found it is a common problem in '03 through '08 model GMC Envoys and chevy trailblazers.
Broken manifold bolts which it appears from searching the internet is a common problem on GMC v-8 engines.
The exhaust manifold on my 2005 GMC Envoy xl slt is cracked. I have researched and discovered many of these GMC Envoy and chevy trailblazers have this same incident occurring.
Smell of exhaust while driving. Noticed engine made a ticking sound which went away after engine got warm. Brought vehicle into a service center and a diagnosis of a cracked exhaust was made. Have noticed many other trailblazer and rnvoy owners complaints of exact same issue. Because of the nature of carbon monoxide poisoning in the cab I am entering this into the safety complaint database.