I'm going through the process of having my car tuned via SCT, and now 12 tunes into the process we are at gridlock with a sensor reading issue. Basically, the driver side bank reads way differently than the passenger side, and the verdict that it's Bank 1 that's the anomaly is, fuel table values match the sensor on Bank 2, but not Bank 1.
* 2001, 5# Roe, factory heads/cam.
* Belanger headers, RT ceramic cats, Dynomax 3" bullets, side exhaust.
* O2 sensors are factory Bosch ~ 2 years old with 5K miles, installed in the single tube spot that Belanger headers come with.
* Years ago when I put the headers on I started throwing P0135 (Bank 1 preheat) all the time. Whether the sensors are in the single tube like Belanger made them, or in the bung I added to the merge collector. Code P0135. For whatever that may mean.
* Plugs are a few months old with ~ 2k miles.
* Wires are AB's ~ 5 years old w/ 14K miles.
* Coils are factory original w/ ~ 53K miles.
* Exhaust - manifold to head: no audible leaks or visible carbon tracing i.e. signs of a leak.
I list all of those things as they have been brought up to be suspect in this O2 sensor imbalance. I can't look at any particular one as "the one," or one that is more suspect than the other.
So, in ignorance of it all, my only plan would be to replace it all. Plugs, wires, sensors, coils and so on, without knowing for sure if that will even fix it.
Any suggestions or similar experiences?
Short of tuning fuel enrichment on acceleration as well as higher throttle inputs approaching WOT, the car actually does run pretty well. Those lacking areas have simply not been given any attention yet in the tuning process.
This last log that I did shows the difference between the 2 banks. You can see the disparity clears up as the rpms increase.
* 2001, 5# Roe, factory heads/cam.
* Belanger headers, RT ceramic cats, Dynomax 3" bullets, side exhaust.
* O2 sensors are factory Bosch ~ 2 years old with 5K miles, installed in the single tube spot that Belanger headers come with.
* Years ago when I put the headers on I started throwing P0135 (Bank 1 preheat) all the time. Whether the sensors are in the single tube like Belanger made them, or in the bung I added to the merge collector. Code P0135. For whatever that may mean.
* Plugs are a few months old with ~ 2k miles.
* Wires are AB's ~ 5 years old w/ 14K miles.
* Coils are factory original w/ ~ 53K miles.
* Exhaust - manifold to head: no audible leaks or visible carbon tracing i.e. signs of a leak.
I list all of those things as they have been brought up to be suspect in this O2 sensor imbalance. I can't look at any particular one as "the one," or one that is more suspect than the other.
So, in ignorance of it all, my only plan would be to replace it all. Plugs, wires, sensors, coils and so on, without knowing for sure if that will even fix it.
Any suggestions or similar experiences?
Short of tuning fuel enrichment on acceleration as well as higher throttle inputs approaching WOT, the car actually does run pretty well. Those lacking areas have simply not been given any attention yet in the tuning process.
This last log that I did shows the difference between the 2 banks. You can see the disparity clears up as the rpms increase.