O2 Sensor Locations
Thread Starter
On The Tree
Joined: Jul 2014
Posts: 143
Likes: 0
From: Lincoln, CA
O2 Sensor Locations Hey guys, I posted this over in the Gen III External Engine section a few days ago without any answers and am hoping for better luck over here... I'm going to be using a set of C6 LS3 exhaust manifolds for swapping a 5.3/4l80e in to my '89 K5 and had a couple of questions about the O2 sensor locations. The C6 manifolds have the O2 bungs built in above the outlet flange instead of being in the exhaust piping 6-8" down stream of the outlet like on the donor truck. Will them being that much closer to the engine affect anything (like tripping the CEL) or require any additional tuning for them to read correctly since I'm using the 0411 PCM from an '02 Silverado? I've been searching around on here and other forums but everything I'm seeing is for people moving them further downstream or installing wide band O2's... Here's what the C6 manifolds looks like for reference:
For the rear O2, is there a set distance it needs to be from the engine or cats or do you have some wiggle room? I've heard they can be pretty finicky and trip CEL's if they're too far away but haven't been able to find out if there's a sweet spot that it needs to be in yet... On my donor, it's on the DS exhaust tube right before they merge at the Y so I'm hoping to keep it pretty close to that when we run the new exhaust in the K5 but I'm not sure how that'll work out looking at how ugly the current exhaust is ran to fit around all of the 4wd stuff...
For the rear O2, is there a set distance it needs to be from the engine or cats or do you have some wiggle room? I've heard they can be pretty finicky and trip CEL's if they're too far away but haven't been able to find out if there's a sweet spot that it needs to be in yet... On my donor, it's on the DS exhaust tube right before they merge at the Y so I'm hoping to keep it pretty close to that when we run the new exhaust in the K5 but I'm not sure how that'll work out looking at how ugly the current exhaust is ran to fit around all of the 4wd stuff...
Teching In
Joined: Nov 2014
Posts: 14
Likes: 1
From: Bakersfield
I put a 5.3 from a 2003 into a 57 pick up and put only 2 O2 sensors in (Bank1 sensor 1 and Bank 2 sensor 1). One on each side about a foot from the collector and had no CEL issues. Be sure you put the correct harness on the correct side! That was my only issue. I mixed them up and had one side running lean and the other was so rich it fouled the plugs. Switch the O2 wires and it ran great.
Thread Starter
On The Tree
Joined: Jul 2014
Posts: 143
Likes: 0
From: Lincoln, CA
I put a 5.3 from a 2003 into a 57 pick up and put only 2 O2 sensors in (Bank1 sensor 1 and Bank 2 sensor 1). One on each side about a foot from the collector and had no CEL issues. Be sure you put the correct harness on the correct side! That was my only issue. I mixed them up and had one side running lean and the other was so rich it fouled the plugs. Switch the O2 wires and it ran great.
