All O2 sensors created equal?

[JeepsAndGuns]

I was wondering if most all narrow band o2 sensors are created pretty much equil?
My cherokee seems to want to run at around 13.5 afr about 90-95% of the time once in closed loop. It will come up to around 14.7 for a while every now and then, but then usally adjusts itself back down to closer to 13.5.
I found that if I hooked the simulated NB output of my MTX-L to the ecm, once in closed loop it will stay at almost a perfect and steady 14.7. BUT, after a couple days, I get a error code for o2 sensor failure. I reset the pcm and all is well again for a couple more days. When I hook the NB back up, I never get any error codes, but I get the 13.5 afr.

So, could it be the bosch o2 sensor I am using? Are the output voltages different based on what applacation they are intended for? Its a 4 wire heated sensor, not from a chevy. You think swapping to a 3 wire ac delco (or something simillar) made for vehicle that came factory with a 7427 would help?
Thoughts, ideas?

[96lt4c4]

I was wondering if most all narrow band o2 sensors are created pretty much equil?
My cherokee seems to want to run at around 13.5 afr about 90-95% of the time once in closed loop. It will come up to around 14.7 for a while every now and then, but then usally adjusts itself back down to closer to 13.5.
I found that if I hooked the simulated NB output of my MTX-L to the ecm, once in closed loop it will stay at almost a perfect and steady 14.7. BUT, after a couple days, I get a error code for o2 sensor failure. I reset the pcm and all is well again for a couple more days. When I hook the NB back up, I never get any error codes, but I get the 13.5 afr.

So, could it be the bosch o2 sensor I am using? Are the output voltages different based on what applacation they are intended for? Its a 4 wire heated sensor, not from a chevy. You think swapping to a 3 wire ac delco (or something simillar) made for vehicle that came factory with a 7427 would help?
Thoughts, ideas?

Depending on where your 02 is in the exhaust. The bosch sensors are garbage. Get you a 3 wire heated sensor, AC Delco. Get one for a 94 full size chevy truck. You will go into closed loop sooner and you should see 14.7 AFR.

[96lt4c4]

The truck I just got done tuning was throwing the 02 code 13. The 12 volt line to the sensor was bad keeping the heater off. I fixed the 12 volt line, no more code and its going into closed loop at idle now, runs way better.

[RobertISaar]

Delco or Denso(they seem to be the real manufacturer of the Delcos) is the way to go. us FWD'ers also avoid Bosch sensors like the plague due to the same issues.

from what it's been rumored in the past, the Bosch sensors respond differently than the Delco units. while it could probably be accounted for in the calibration, it's just a lot easier to use the part the calibration was setup for.

[JeepsAndGuns]

Sounds like its time to hit up rockauto and order one.

[woody80z28]

I agree. My Bosch o2 from Napa sucked. Got a Denso online and immediately helped a ton.

[JeepsAndGuns]

The following was taken from another thread talking about changes to bins for conversions.

1. Where is the O2 sensor now compared to when it was stock? How far a difference? Convert it to percent and adjust "Integrator Delay Vs. Airflow"

2. Proportional Gains vs O2 Error - "PRP - Gain vs. O2 Error" and the multiplier " PRP - Gain vs. Air Flow" need to be reduced 25% to 50% depending on cam.

Mark, those two o2 sensor comments you just posted, could that be something I may need to do? Where is the o2 in a stock 7427 vehicle?

[EagleMark]

1995 Chevy truck is way back after Y pipe, so if you have long tube headers and in collector or after collector your probably OK. This is not the norm though as most early GM EFI were in exhaust manifold or right after.

INT or Integer Delay is time it takes for PW adjustments to reach O2 sensor, when way off because of headers or conversion it can read wrong time.

[JeepsAndGuns]

1995 Chevy truck is way back after Y pipe, so if you have long tube headers and in collector or after collector your probably OK. This is not the norm though as most early GM EFI were in exhaust manifold or right after.

INT or Integer Delay is time it takes for PW adjustments to reach O2 sensor, when way off because of headers or conversion it can read wrong time.

Right now I still have the stock manifolds, the NB is probably 6-8 inches away from the outlet of the left manifold. So definately a lot closer to the engine than a stock 7427 vehicle. I dont really have a "Y" pipe per say, I have a dual in, single out magnaflow muffler. I have the pipes coming from the manifolds down past each side of the trans, then joining to the dual inlets of the muffler right behind my transfer case. They join together inside the muffler and then exit at a single 3in oulet.
So, since the NB is so much closer, do you think the delay needs adjusted? This could be the problem with my AFR?

[EagleMark]

Right now I still have the stock manifolds, the NB is probably 6-8 inches away from the outlet of the left manifold. So definately a lot closer to the engine than a stock 7427 vehicle. I dont really have a "Y" pipe per say, I have a dual in, single out magnaflow muffler. I have the pipes coming from the manifolds down past each side of the trans, then joining to the dual inlets of the muffler right behind my transfer case. They join together inside the muffler and then exit at a single 3in oulet.
So, since the NB is so much closer, do you think the delay needs adjusted? This could be the problem with my AFR?

Dont mean to hijack this thread, you can move these posts to my o2/AFR thread.

Moved posts!

I don't think so? It needs to delay so the adjusted PW is noticed by the O2 sensor before adjusting again. Since it's shorter it already see's it sooner... I don't think it's your AFR difference, but it may help to shorten the time.

[JeepsAndGuns]

I understand the need for the delay. But the more I think about it, the more its making want to think it needs adjusted. I mean, the o2 is several feet closer to the engine than a stock 7427 vehicle, and if the pcm is using a delay set up for a far off o2, and mines close, it might be taking readings from the wrong time frame?
Maybe I am just completely misunderstanding it.