Tweaking Exhaust

[Maria80386]

I am now the proud owner of 2 2008 H3s, rather have them than a white picket fence house.

Anyways, am bringing the new one up to snuff and now trying to figure out if anyone's solved the acceleration equals choking exhaust fumes inside the cabin. It's been suggested to angle the exhaust out to the side instead of the back, replace the rear door weather stripping, or, heaven forbid, don't accelerate so hard. Well, in CA, sometimes you need to use your V8.

Any ideas?

 

[Kyle]

This sounds like an exhaust leak around the headers or cats. Take it to a local exhaust shop and have them check it out


Sent from my iPhone using Tapatalk

 

[Happy Hummer]

Need more information to offer any thoughts on possible repair.
Year, milage, any codes, any weird erratic behavior of vehicle, etc...?
I take it this is a new purchase?
Chris

 

[Maria80386]

New purchase with 114k miles. The other one has 74k miles and is doing it too. The other has no codes, the second is the new purchase and getting dealerized on Monday for several codes.

The wierd part is the old one has been doing it since new, apparently the design dumps fuel into the cat converter to cool it and that's where the smell comes from, or I got fed a line of hooey.

 

[Ghostbuster]

Lol you got fed a line of hooey.

You have an exhaust leak.

 

[4speedfunk]

the acceleration equals choking exhaust fumes inside the cabin.

First I've heard of this.

 

[Rodzlla]

Sounds like a cracked exhaust manifold. Been there, done that.

Mine was cracked behind the heat shield, but it really only leaked when cold. When the truck heated up, it sealed itself up.

 

[Reloader]

First I 've heard of this too. Where in Phoenix you be? I'm by Luke airbase. If you want we can put your 3 up on hoist and give exhaust a good looking over? I had to reseal manifolds to heads on my Alpha due to broken bolts, an easy fix but never experianced any fumes ever.
just the cold engine ticking noise until things warmed up and swelled shut.
The 5 bangers do crack their exhaust manifolds. Alrocks was the worst one I've seen and he never complained of fumes. (Or maybe he liked it, that could explain some things. ) What codes are coming up? Wonder if maybe an evap issue and you are smelling fuel vapors leaking. Both vehicles have problem? I have a great exhaust guy in Avondale that does awesome exhaust work real reasonable . Are your exhaust systems stock or modified?

 

[Maria80386]

The new one has a modified exhaust and a warranty date with the dealer tomorrow. I'm not liking the growl it produces so will be taking back to stock, an "X" mod, or out the side. Once she's done being dealerized, I'd like to take you up on your offer.

The other lives in Ohio and will be sitting for awhile. Once I'm back in the area, I'll get it into an exhaust shop. Any recommendations for Dayton through to Cincinnati?

 

[Reloader]

Not familiar with that area although I am from Wisconsin. Just went and looked to see if I still had my oe exhaust laying in back yard. It's off my 08 Alpha and you would be welcome to it. I drug it here in move from WI thinking I may use it again but I fear I scrapped it out . My guy in Avondale can build you any thing you want. Don't let dealer sell you an exhaust system. That would lighten you wallet considerably? My guy built me a custom cat back dual 3 inch outlet with flowmaster setup for around $300 I think. He likes cash. where you at in valley and which dealer you taking it to?