Bad bad bad BAD misfire!

[oldsman003]

3/4 ton 6.0 yukon xl 4x4

 

[02YukDenXL]

Is it the LQ4 motor?

 

[oldsman003]

Yes, all info was listed in original thread. Some 70 some odd replies ago, lol

 

[t_ahan]

happy to hear shes running!
I hope theres no damage from the misfire?

 

[ccapehartusarmyINF.(ret)]

Well evidently everybody I've spoken to, ase mechanics gm mechanics being hooked up to 2 snap on tuners. And nobody told me there is a strategically hidden bank 2 precat. Completely blocked. Broke the flange loose on that side and fired her up and heard those four cylinders for the first time in months
Drove my truck with ease yesterday for the first time in 6 months. Felt great

okay im confused hidden bank 2 precat ? pre-cat what? precat 02 sensor or pre cat catalytic converter not tryin to be a smart ass or anything im askin cuz id actually like to know about this

 

[about20ninj45]

okay im confused hidden bank 2 precat ? pre-cat what? precat 02 sensor or pre cat catalytic converter not tryin to be a smart ass or anything im askin cuz id actually like to know about this

I believe he was talking about another cat convertor. He posted pictures of the exhaust on the last page

 

[oldsman003]

From what I've seen all other 2500s don't have the precat converters, I'm not sure if it's specific to the yukon or what. No lasting damage from misfire I pieced the front section back together ands gutted the cats all four of them for the time being and she is running great