Mechanical Problems & Technical Chat - rough idle o2 sensor issues

ok guys im new here and do i have issues. here goes. problem one!. i did a d16y8 swap in my 98 hx. i replaced my before the cat sensor, but i cant find where my secondary one goes. i did an ex wire harness swap as well. second. with teh sawp says i need a knock sensor. mine didnt have one, do i need it? and third i replaced my cam with a stage 2 crower with a skunk 2 intake and the car wont idle at all flucks from 2500-300, i know the dle will be bad but this bad? so heres my probs, any ideas please help

More agressive cams will cause your idle quality to be changed. You could call Crower and ask them if that is normal. Also, you can adjust the idle. First disconnect the Idle Air Control (IAC) motor. Start the car. Next find the screw on the throttle that adjusts the throttle at idle. Turn the screw until the idle is where you want it. Turn the car off, reconnect the IAC.

ok ill try that, what about the knock sensor, do i need that? and hwere is the second o2 sensor plug?

If your car isn't OBD II originally it will not have the plug for the secondary O2 sensor, you might have to wire one from the PCM. You do need a knock sensor, it tells the PCM if the ignition timing is correct. W/O the knock sensor your engine will not know if you have any preignition problems.

my car is obd2 and my other harness had the second sensor in the harness. this one doesnt and came out of a 97 ex. how come my hx head iddnt have a knock sensor?

The knock sensor goes in the engine block if i am not mistaken. If the engine and your car are both OBD II, then you should have a knock sensor on the block and a connection for it in your harness. But your head should not have the knock sensor attached to it. The knock sensor on an HX coupe is behind the oil filter, axle, and oil pressure switch (all in the same place). If you want a picture of it, i can email it.

ok so i put in the knock sensor seems better, another question is where does the after the cat o2 sensor wire connect to? i dont see anything on the harness=. also will that affect my idle?