Dont even attempt it, your ECU isnt programmed for it, and the truck aint wired for it. Your best bet would be to verify just how far into the pipe your O2 is reaching. Can pull your bosch outta the flange and measure the length of the sensor area..can compare it to what the Stock units length is....approx. 1-1/4"...hard to tell since I was measuring the old one thats burned up purdy goot.

Also double check my thoughts on the whole subject, I wont be offended... GOD knows Ive been wrong before and surely will be again. But last I checked, if the sensor aint in the flow then its not gonna send the proper information to the ECU. Think of it like this...gonna take a leak, you have the right parts, your in the right room, walk up the sink and let her flow. Oooops....everything was right except for your position and aim. Now ya got a mess to explain. <img src="/forums/images/graemlins/rolleyes.gif" alt="" />

I'd like to do some more research on this and find out why some people can run without O2s, others have no problems and yet still others with same setups are running like chit.

Your extreme rich condition points so hard at O2 issues so much that...well I wont go there. LOL Sorry. But a cold O2 sending lean signals to the ECU results in poor over-richened mixture and tremendous loss in mileage per gallon.

~Darin <img src="/forums/images/graemlins/baby.gif" alt="" />