power loss 2002 z28 a4

**2002blackz28** · 07-02-2009, 04:30 PM

my car runs and idles fine but a few weeks ago i noticed a little bit of power loss. it just seems like I can't feel the torque as it pulls threw first and goes into second . 2002 z28 a4. 70,000 miles. what else could cause this sudden loss of power. I changed all filters and plugs wires.I just ordered high flow cats. I think the old ones may be a little clogged. but no engine codes. a few weeks ago a had to replace bank 2 number 1 -o2 sensor and it hasn't been the same since then. It also seems from a stop and as i slowly go WOT I can get faster harder acceleration than just hammering it from a stop,could it be my TPS going out. all comments are gladly welcomed

**JaycenK** · 07-03-2009, 10:24 AM

You should always replace 02's in pairs never just one at a time. Is that the primary set of 02's in front of the cats? or are they behind the cats?

**JaycenK** · 07-03-2009, 10:28 AM

As for hammering it of the line if you have stock cam the slow increase in air introduced into the manifold allows for torque to build up. If you just go to WOT you are not going to have as much torque bild up in the motor. If they 02 you replaced was from the set infront of the cats that could have a little to do with it. HP is not what gets the car off the line it's torque.

**2002blackz28** · 07-03-2009, 03:58 PM

on the maifolds before the cats

**2002blackz28** · 07-03-2009, 03:59 PM

Originally Posted by JaycenK

As for hammering it of the line if you have stock cam the slow increase in air introduced into the manifold allows for torque to build up. If you just go to WOT you are not going to have as much torque bild up in the motor. If they 02 you replaced was from the set infront of the cats that could have a little to do with it. HP is not what gets the car off the line it's torque.

should I just buy a tuner/programmer and see what happens