so I have a 97 3500 8.0 v10 its throwing lean code only on bank 2 but is rich and has bad carbon built on the plugs in all 5 cylinders i am going to say its an 02 but they have less then 100 miles on them iam running short race headers an 3in straight pipe done by a guy who built race cars for a living so iam at a loss the only thing I guess it could be is spark if anyone has had this happen to them please help me out

 

What brand O2 sensors?

 

to tell you the truth I don't know
if I remember I got 4 on rock auto and 1 from Amazon

 

Check your purchase history, that should tell you. If they are bosch sensors, that's a large part of your problem.

 

I went thru and found them its a company called Max favor do you have a brand of 02 you highly recommend

 

NTK or Denso were OEM. They actually work properly on these trucks, which seem to be REALLY picky about sensor brand.

 

ok update just ordered new o2 all the way around denso brand i went under the truck to check the pipes and carbon is starting to build bad iam also going to replace the intake manifold gaskets as well to see if that helps if not I found a Screamin' demon coil pack on summit racing thats supposed to run hotter and 10mm plug wires to counter the richness if the o2 doesn't help

 

Fuel pressure? Does it hold between starts?
How does it run otherwise? If you are going that far in, for gaskets, couldn't hurt to look for leaking injectors and bad injector wiring. Oxygen sensors can't tell the difference between too much oxygen from flooded incomplete combustion or a lean condition. If you are really flooding you will at some point gas wash your rings.Throwing parts money at a situation with no diagnosis.
If you have four sensors and no cats, I don't know what the computer thinks it sees when something is going wrong.Good luck, you'll sort it out, these trucks are pretty easy to work on, just don't always do what they are supposed to.