Bad bad bad BAD misfire!

[jough]

I had a similar issue when the exhaust shop installed my 6.0 mid-pipes (w/cats) and a cat-back system earlier this week.
On initial start-up, I had random misfires on bank 2 and lean codes. They replaced the front 2 O2 sensors (bank 2 pre-cat was black). That eliminated the lean code. We could nothing else wrong. To get me home, they drilled holes in the pipe just before the cats (to save the cats from overheating) and that fixed it. Then they welded up the holes and it has been running really good since then. I am not yet confident in the reliability. Anyway, I would like to know what caused it and hope you figure it out and let us know.

 

[ccapehartusarmyINF.(ret)]

have you changed yer knock sensor yet becuase a faulty knock sensor can cause symtoms like yours

 

[jough]

No.

 

[ccapehartusarmyINF.(ret)]

Bad Knock Sensor Symptoms

The most common symptom of a failed knock sensor is the flashing of the 'Check Engine' light on the console or dashboard of the car. However, sounds generated by the combustion of bad gasoline can also trigger the knock sensor. You need to fill the car with high grade gasoline. If the light is still flashing, you need to get the sensor checked by a mechanic.
Improper combustion of fuel and air can cause the knock sensor to malfunction. You can normally detect this when you hear clunking, thumping, or sputtering noises coming from the engine, which gradually increase in intensity over time.
Another symptom of a faulty knock sensor is the misfiring of the engine on starting, accompanied by unusual vibrations throughout the vehicle.
Knock sensor failure is often followed by a significant drop in the fuel economy of the vehicle.
Burning fuel and exhaust smells emanate from the engine area.
In case of a knock sensor problem, the car may exhibit certain signs such as slowed acceleration, and dragging or jerking sensations while trying to step on the gas.
If you see corresponding light codes such as P0325 or P0330 from the user manual, it could either signify a misfire in the engine cylinders or the failure of the knock sensor.

 

[ccapehartusarmyINF.(ret)]

sounds like youve covered everything else knock sensors the last thing if that doesnt fix it id roll the windows down and drive it into a nearby lake somewhere
make sure you have full coverage before hand though

 

[#1taho]

I am undecided on if should change the knock sensors on the 6.0 when i do the swap. i am keeping the 6.0 intake so I don't need to take off the intake. I had it running before i pulled it out and it ran perfect. there are a few small seeping oil leaks so I do have to do rear main and oil pan gasket, i have to finish tearing the wiring and accessories off to finish determining what more i will have to do.
I am undecided cause I am having this tranny gone through and adding some goodies to help save it and most gaskest and it's starting to add up, I have to save for the tune also. just don't know where to stop. If money was endless i would do it all.

 

[ccapehartusarmyINF.(ret)]

i hear yah man seems like no matter what kinda vehicle you own it still winds up turning into a money pit my tahoe i had before this suburban id get everything fixed that needed to be so itd be in good running shape then like a month later something else would go wrong the suburban im drving now i just fixed a stuck lifter so its not so noisy now when i start it but then like the next day my radiator sprung a leak you cant win seems like the only way you can break that money pit cycle is swallow yer pride and buy a kia

 

[#1taho]

i hear yah man seems like no matter what kinda vehicle you own it still winds up turning into a money pit my tahoe i had before this suburban id get everything fixed that needed to be so itd be in good running shape then like a month later something else would go wrong the suburban im drving now i just fixed a stuck lifter so its not so noisy now when i start it but then like the next day my radiator sprung a leak you cant win seems like the only way you can break that money pit cycle is swallow yer pride and buy a kia

I will keep my money pit over a Kia lol. I know they are cheep but na. My wife has a 2012 300. And I have done the rack three times already and now 10 k later I have to do it again!!!! Should have kept the H3!!! And I hated that thing too!!!

 

[ccapehartusarmyINF.(ret)]

LOL i give my mother crap becuase she had a reallly nice 2003 corvette wich tended to nickel and dime her to death buy hey its still a corvette
and she sold it and bought a new kia sorento and to ad insult to injury she got like a base model 2wd one she didnt get the loaded model with AWD and lots of bells and whistles
i was like WTF

both my perents went from driving a tahoe and a corvette to a kia sorento and a kia soul

and the kinda sad thing is the mileage is a litttle better 26 mpg in that neighboorhood
but they still got rediculously small gas tanks in them the sorento has 14 gallon and the soul has a 12 gallon

 

[#1taho]

LOL i give my mother crap becuase she had a reallly nice 2003 corvette wich tended to nickel and dime her to death buy hey its still a corvette
and she sold it and bought a new kia sorento and to ad insult to injury she got like a base model 2wd one she didnt get the loaded model with AWD and lots of bells and whistles
i was like WTF

both my perents went from driving a tahoe and a corvette to a kia sorento and a kia soul

and the kinda sad thing is the mileage is a litttle better 26 mpg in that neighboorhood
but they still got rediculously small gas tanks in them the sorento has 14 gallon and the soul has a 12 gallon

Wow. That's good for them but wow what a down grade. As long as they are happy. I wouldn't be. I think I will probably own cars that are about this age. Just to be able to tinker with them. I would be to afrade to buy a new $80,000 truck and start building off of that.