Lsx_Lee6spd

iTrader: (20)

I recently bought a 98z28 a4 with a few bolt-ons, when I got the car it had a few codes in it that I just erased out out. I recently changed the plugs ( ngk tr55 v-powers @.55 ) and a few other routine things. After everything was said and done the only 2 codes that came up were P0154 02 Sensor Circuit No Activity Detected (Bank 2 Sensor 1) then after a while it went away and was replaced by a P0151 Oxygen O2 Sensor Circuit Low Voltage (Bank 2, Sensor 1). Idk what to do, I replaced the MAF sensor, removed the oily k&n filter, replaced the o2's. The funny thing is when I just unplugged the MAF the only codes that came up were for the MAF no o2 codes wat so ever. I'm stumpped, could I get some guidance please. I'm tired of huffing black smoke & rough idling etc

703 CAMAROSS

Does it jerk a little when you hit the gas?

Lsx_Lee6spd

iTrader: (20)

Yes it does have a slight buck when accelerating, but yesterday I changed the o2's again and the codes went away until I was almost home then I got a P0133 Oxygen Sensor Circuit Slow Response (Bank1, Sensor1). So once again I'm lost

703 CAMAROSS

I'd check the throttle position sensor. Check the voltage going to it while u drive and see if it is steady with the amount of gas you apply. If its messed up it could be reading funny and thinking your applying allot and making it run rich because the computer adds more fuel. That's what I would do.

703 CAMAROSS

Applying allot of throttle*

Lsx_Lee6spd

iTrader: (20)

Ever since I erased the codes lastnight they haven't popped back up yet, but I'll still check the tsp sensor. Also would a bad etc sensor throw anything out of wack besides the temp gauge ? Mines doesn't work lol