O2 sensor questions
Thread Starter
Racer
Joined: Apr 2011
Posts: 320
Likes: 2
From: Philadelphia PA
O2 sensor questions
I have 97 stick with cai, long tubes, exhaust and its dyno tuned. The car lately has been running rough and smels terrible. At idle sometimes it almost stalls out but it doesn't. I checked all fluids and plugs and wires and they're all good. I took to autozone for a free scan and it came up as an o2 sensor. I initially thought it could be a bad cat because of the smell but more mechanicas than not told me to change sensors. Ps e cats are 6 months old.
Ok so I know there 4 and they are all different. Can anyone shed some light where each one goes with a diagram or something. Since its so easy to just unscrew and replace I plan to do it myself.
Any advice?
Ok so I know there 4 and they are all different. Can anyone shed some light where each one goes with a diagram or something. Since its so easy to just unscrew and replace I plan to do it myself.
Any advice?
Melting Slicks
Joined: Jul 2012
Posts: 2,507
Likes: 9
2 front ones are for fuel delivery, the rear 2 are used to determine if the catalytic converters are functioning correctly. I hook one of my scanners up to check the output of the O2's. You want to graph the output of the O2's to see if they are switching from lean->rich and rich-lean in a regular pattern. By the way, you do not need a scanner to get codes from a C5, a Senior member should know this already.
Le Mans Master
Joined: Jun 2009
Posts: 6,528
Likes: 752
From: South Dakota
I agree. Pull the codes on the DIC. The codes will tell you more than it is an O2 sensor. It will tell you which one as well as some detail like out of range, or heater circuit malfunction, etc. Once you pull the codes, the meaning of the codes can be found here too (or post the codes and forum members can help).
With longtube headers, frequently the rear two sensors may have been tuned out and no longer present. I don't know on your car, but if you look under it you should be able to see.
Good luck.
With longtube headers, frequently the rear two sensors may have been tuned out and no longer present. I don't know on your car, but if you look under it you should be able to see.
Good luck.
Pro
Joined: Aug 2009
Posts: 662
Likes: 0
From: Loxahatchee FL
2 front are same / 2 back are same.
If you are tuned as stated, your tuner most likely turned the rears off and turn off any warnings/DTC/CEL to remain off.
The code received saying the O2 was bad, what was the code as that will tell you what side it was or based on miles you can replace both front at same time and the torque setting on them is 30LB
If you are tuned as stated, your tuner most likely turned the rears off and turn off any warnings/DTC/CEL to remain off.
The code received saying the O2 was bad, what was the code as that will tell you what side it was or based on miles you can replace both front at same time and the torque setting on them is 30LB
Thread Starter
Racer
Joined: Apr 2011
Posts: 320
Likes: 2
From: Philadelphia PA
2 front are same / 2 back are same.
If you are tuned as stated, your tuner most likely turned the rears off and turn off any warnings/DTC/CEL to remain off.
The code received saying the O2 was bad, what was the code as that will tell you what side it was or based on miles you can replace both front at same time and the torque setting on them is 30LB
If you are tuned as stated, your tuner most likely turned the rears off and turn off any warnings/DTC/CEL to remain off.
The code received saying the O2 was bad, what was the code as that will tell you what side it was or based on miles you can replace both front at same time and the torque setting on them is 30LB
Melting Slicks
Joined: Dec 2011
Posts: 2,234
Likes: 64
From: Gulf Coast Mississippi
St. Jude Donor '13-'14-'15
I recently had these same type issues, after getting under the car, I found one side (passenger) the wires to the sensor had came in to contact with the header, after repairing everything was fine. The sensors can and will affect the car 4 sure.
Good luck
Good luck
Thread Starter
Racer
Joined: Apr 2011
Posts: 320
Likes: 2
From: Philadelphia PA
Thanks
Le Mans Master
Joined: Jun 2009
Posts: 6,528
Likes: 752
From: South Dakota
Good luck.
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Burning Brakes
Joined: Oct 2013
Posts: 859
Likes: 1
I haven't gotten under it yet but I feel as though I might have the same issue. Its been weird ever since I did the headers. What exactly was wrong with your connector? Did you repair or replace it? Do I need it up high on a lift or can I just jack it up and do it in my garage on jack stands?
Thanks
Thanks
Melting Slicks
Joined: Dec 2011
Posts: 2,234
Likes: 64
From: Gulf Coast Mississippi
St. Jude Donor '13-'14-'15
I haven't gotten under it yet but I feel as though I might have the same issue. Its been weird ever since I did the headers. What exactly was wrong with your connector? Did you repair or replace it? Do I need it up high on a lift or can I just jack it up and do it in my garage on jack stands?
Thanks
Thanks
Good luck, let us know what you find ok
Thread Starter
Racer
Joined: Apr 2011
Posts: 320
Likes: 2
From: Philadelphia PA
All fixed. Turns out it was the passenger o2 sensor. Once I got under it I saw that the plastic harness was resting on the header flange. I changed the sensor and re routed it and all good. I washed her up all nice and had her out for a nice test drive all day yesterday. Now back in the garage for the upcoming snow.
Thanks for the help. Easy fix once diagnosed.
Thanks for the help. Easy fix once diagnosed.