Hey i just bolted a 4-2-1 header onto my 96 civic dx d16y7 but i just ordered my highflow cat so it just goes to a test pipe right now and no cat also my second o2 sensor isnt attached because i need to buy a new one and extend the wires to the bung on the high flow cat. Could this be why im getting no power? Because the 02 sensor isnt attached or because i have a test pipe instead of a high flow cat? All i know is it is installed correctly and the its really loud i also get backfire with it and im not sure why. I need to know if hooking up the 02 sensor will get my power back or if i need to do the cat as well. Thanks so much

 

Hook the sensor back up

 

i cant get it out of my old header. plus i have no places for it because i dont have the high flow cat in yet

 

if you dont have the 2nd o2 hooked up your car most likely is in 'limp' mode might have a CEL on or code on your ecu, wait til you get the cat, then hook the sensor back up

 

I agree here . the car is in "limp mode" I'd wait til you get the cat back and hook the o2 into it.

 

second o2 sensor doesn't do jack for fuel trim..it only tells you if the cat is bad or not. Sounds like you're running too rich if you're backfiring. You do have the primary o2 sensor installed on the header? I think you probably didn't torque down the header correctly to the block and your primary o2 sensor is seeing extra air and then makes you run way rich.


[Modified by WundedSaint, 2:49 AM 3/30/2003]

 

alright ill try to retorque down the header and yes the primary 02 sensor is in the header

 

i torqued them all down to 25 and im almost positive the 02 sensor has something to do with it because it talks to ur ecu also it smells bad it supposed to for the first little while like u can really smell the fumes when i rev it and sit in the same place its also putting out white smoke. Please let me know thanks