2 questions if i may?

hello everyone. just wanted to say great site. i have 2 questions 1st when removing rear o2 sensors are the front sensors bank 1 and the rear ones bank 2 its for my 02 5.3 o/s 12156. 2nd question is i put in a btr stage 2 cam everything else is stock but i cant seem to get it to idol correctly i tried some pointers from this site and some youtube videos but i must be doing something wrong. just wondering if anyone has the same setup as me that can give me some tips it would be greatly appreciated. thank you

front is bank 1 and rear is bank 2 in every vehicle i've ever dealt with

if your larger cam wont idle and you're sure you didn't botch it (is lash correct? have you checked compression?) then usually you want to add some timing advance at idle (say 3-4 degrees to start) as well as increase the idle speed. that cam doesn't look very big though, it shouldn't be having idle issues.

Quote:

---

Originally Posted by steveo

front is bank 1 and rear is bank 2 in every vehicle i've ever dealt with

if your larger cam wont idle and you're sure you didn't botch it (is lash correct? have you checked compression?) then usually you want to add some timing advance at idle (say 3-4 degrees to start) as well as increase the idle speed. that cam doesn't look very big though, it shouldn't be having idle issues.

---

For the o2 sensors thats what i thought reason i asked is i saw a video on yt and he was sayin bank 1 sensor 2 is rear and also bank 2 sensor 2 was the other rear thats why i asked. And for the cam the motor ran mint before and i checked the compression its perfect. Ill try what you mentioned see if it helps. Thanks for your help

I’m thinking for the LS engine family:
Bank 1 Sensor 1 is the front O2 before catalytic converter.
Bank 2 Sensor 1 is the front O2 before catalytic converter.

For LS engine swaps without catalytic converters I delete:
Bank 1 Sensor 2 rear O2 after catalytic converter.
Bank 2 Sensor 2 rear O2 after catalytic converter.

honestly bigger cams need higher idle if you want it to run smoothly, just adding 100-150rpm might fix 'er right up. if it doesn't, you might have degreed the cam wrong, or left a rocker nut too tight.

thank you

Quote:

---

Originally Posted by steveo

honestly bigger cams need higher idle if you want it to run smoothly, just adding 100-150rpm might fix 'er right up. if it doesn't, you might have degreed the cam wrong, or left a rocker nut too tight.

---

ill check over everything and try adding some rpm. thanks again.

no problem, can i ask what the idle is like? is it stumbling or....?

Quote:

---

Originally Posted by steveo

no problem, can i ask what the idle is like? is it stumbling or....?

---

sorry for the late reply it falls flat on its face when i stomp on it.

Bank 1 is usually the side of the vehicle that the #1 cylinder is on. Bank 2 is the side that the #2 cylinder is on. Sensor 1 will be pre cat sensor and sensor 2 will be after cat sensor.You have :

B1S1 Drivers side pre cat
B2S1 Pass side pre cat
B1S2 Drivers side after cat
B2S2 Pass side after cat.

Post your bin file.