Rear O2 function and input
#81
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and you mention full standalone, i was heavily considering going with aem for tuning, but tuners on here said it did not work well
i would put cats on, but i need to get the hot nitrous burn out of my engine as fast as i can. i had cats on a nitrous motor before and i had bad heat problems. i will also have a cutout before the muffler, so it would be silly to have cats and then a cutout, since getting the exhaust out as fast as i can is a priority.
i would put cats on, but i need to get the hot nitrous burn out of my engine as fast as i can. i had cats on a nitrous motor before and i had bad heat problems. i will also have a cutout before the muffler, so it would be silly to have cats and then a cutout, since getting the exhaust out as fast as i can is a priority.
Last edited by mgrotel; 04-12-2012 at 06:07 AM.
#82
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the rear o2's still work without cats when u put them in the exhaust flow. The emissions control gets upset (catalyst codes) but that's it. A/F's are good.
When it's time to pass emissions testing in an obd2 state like MD I put the non-foulers (extensions) back on, enable all emissions codes, drive for 20 miles or so and it passes. It usually takes 50-300 miles until lean codes trip with anti foulers; plenty of time to get thru emissions with flying colors LOL.
When it's time to pass emissions testing in an obd2 state like MD I put the non-foulers (extensions) back on, enable all emissions codes, drive for 20 miles or so and it passes. It usually takes 50-300 miles until lean codes trip with anti foulers; plenty of time to get thru emissions with flying colors LOL.
Last edited by djamps; 04-12-2012 at 06:42 AM.
#83
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I have to actually see the cats when I do CA inspection, interesting. Plus I know the smell of a bad cat and a missing cat is worse, EVO guy tried sneak one through once. There is a new OBD II+CAN based smog testing machine coming that I'm pretty sure can detect reprogramming. It will finally read VIN's too. Even my pocket scanner can do that but not my BAR97 POS.
Can you look at your datastream and see if the ECU is still doing the lean/rich injector pulse width switching? I'm thinking there is a default mode that I was never told about.
Can you look at your datastream and see if the ECU is still doing the lean/rich injector pulse width switching? I'm thinking there is a default mode that I was never told about.
#85
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So, although not what you asked for, djamps, i did logging on the way to work this morning. It was only about 10 minutes of constant on the freeway, but i saw the A/F's sitting stead about 14.4.
How long constantly cruising do you have to travel before you start seeing the problem? based on your logs.
How long constantly cruising do you have to travel before you start seeing the problem? based on your logs.
#86
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So, although not what you asked for, djamps, i did logging on the way to work this morning. It was only about 10 minutes of constant on the freeway, but i saw the A/F's sitting stead about 14.4.
How long constantly cruising do you have to travel before you start seeing the problem? based on your logs.
How long constantly cruising do you have to travel before you start seeing the problem? based on your logs.
But please tell what year of Z/G you have. We already have evidence that not all years/models behave the same way.
#89
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rear o2 behavior confirmed on an 06.
Last edited by djamps; 04-18-2012 at 05:31 AM.
#91
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I don't know about constant... whatever it takes to get all the systems 'ready' state like you're about to try to pass emissions.
rear o2 behavior confirmed on an 06.
rear o2 behavior confirmed on an 06.
#96
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This all came about when I was troubleshooting the exact symptom I described -- too rich sometimes, **** mpg's, ECU overcorrecting and throwing lean codes on both banks. After doing the usual and passing with flying colors (smoke test intake and exhaust), I took extended drives and logs with and without nonfoulers. As a self-tuner I'm extremely **** about my tune and this was driving me crazy. I was relieved to discover the 'problem' was really so simple.
As you can guess, the non-foulers stayed off my car and never had a code or overfueling since. Went from <18mpg to 25+ on the freeway and the car is noticeably more peppy at part throttle.
As you can guess, the non-foulers stayed off my car and never had a code or overfueling since. Went from <18mpg to 25+ on the freeway and the car is noticeably more peppy at part throttle.
I have an 05 6 speed sedan with a full Non-Revup swap, new 04.5 ECM and new harness. The Revup ECM never complained like a ***** and took non-foulers and ran hard with no codes and it was ready for full on power after a reset and pulling out of the driveway unlike this 04.5 one which continues to SEVERELY **** me off.
This is the amount of codes that come up when they are disconnected. Worse than a German car.
P0139,02 Sensor Circuit Slow Response (Bank 1 Sensor 2)
**********
P0159,02 Sensor Circuit Slow Response (Bank 2 Sensor 2)
**********
P1146,Heated O2 Sensor 2
**********
P1166,Heated O2 Sensor 2
**********
P1147,Heated O2 Sensor 2
**********
P1167,Heated O2 Sensor 2
Last edited by Andrei; 04-24-2012 at 01:54 PM.
#99
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And any car that is not a Revup will have this issue, all the way up to the 07 automatic G35 coupe. Any one who doesn't have a Revup and who have test pipes and use straight non-foulers have this issue and don't know it because there is no codes. They just think it runs normal when it actually doesn't because they don't know the difference. I do.
Last edited by Andrei; 04-24-2012 at 08:00 PM.