[rewadferger]

hey guys, just created an account here, but ,my roommate has been here before, but my question today is regarding a check engine light problem i am having. Last year i got a 125 shot put on and it blew out the stock cats, so i removed all 6 of them, then it blew the welds on the h-pipe so i replaced that with an upr x-pipe. and after i put on the x-pipe with no cats, the check engine light was not coming on, i even passed inspection last year and in texas the check engine light has to be off with nothing in the system to pass. But earlier this year the fuel pump went out in it so i replaced it with a higher flow, a 190, fuel pump. and ever since i replaced it, no matter what grade gas i use, the check engine light will come back on again and again after resetting it, saying its saying system running too rich bank 2. so its something to do with the fuel pump and o2. some say i need to go get it tuned to advance the timing due to more fuel entering the motor, or they say just get some mil eliminators for the o2 sensors. i am open to any ideas or suggestions, thanks.

[97stanggt]

running rich or lean will be the front 02s ...catalyst efficency low would be rear 02s which is what MIL elims are for...so ied say you need to replace the front 02s just do both at once and call it good

[330CubeGt]

Take the Bulb Out...

[rewadferger]

so replace the front o2s or just put mil elims on all?

[97stanggt]

NO NO NO... putting mil elims on your front 02s will screw ur engine for sure replace front 02s with new and if u ever get a cat efficency low on either bank then put mil elims on the rear only

[rewadferger]

alright, i'll try that and let you know how it goes.

[5.8mustang]

with no cats those 02s are reading straight from the engine prolly the root of the problem

[97stanggt]

he says its running rich or lean only the front O2s will throw those codes 5.8m so it has to be the fronts doing it the rears will only throw codes for catalytic efficency