2UZ swap into 1992 FJ80

[Stuckinthe80s]

I know it's been a hot minute since I've updated this thread, or posted at all for that matter. My job has been a time suck for the last 10 months but I'm finally trying to get back at this as well as force a better work/life balance.

I still can't get the catalyst monitor into a ready state. The truck still runs awesome, and I can still see the O2 sensors working, just can't get the damn monitor to say ready. I went on a long drive up 76 east last Saturday evening, going through the drive cycle listed above. That was with cruise control, which I was able to install. Fun fact, a cruise control switch from a 2000 Camry is the same switch as on a 1999 LC. I used CC to keep my speed constant and within the range listed, and ran the cycle 5 times, pulling over and turning everything off in between cycles. This was SO much fun on the interstate, but doing it at night, the traffic wasn't too bad.

My next step, I think, is to take it to AA Performance Exhaust and see if they can see something I'm not. I'm grasping at straws here, but I'm wondering if my v-bands aren't sealing up as good as they could be and it's allowing air to suck in and mess with the levels the sensors are seeing.

More to come...

 

[FunkyYota]

I appreciate your perseverance on oxygen sensor issue, I just put a switch on my CEL. Ha

Did the 2000 Camry cruise control switch mount up to the column well? That is one of a couple things I would still like to fix on mine.

 

[Stuckinthe80s]

I appreciate your perseverance on oxygen sensor issue, I just put a switch on my CEL. Ha

Did the 2000 Camry cruise control switch mount up to the column well? That is one of a couple things I would still like to fix on mine.

If it wasn't for the stupid referee process, I would have given up on the catalyst monitor a long time ago. It's not affecting the performance at all. I'm still getting a consistent 17 mpg on the highway, and it's not lacking in power in any way.

No, the Camry switch doesn't mount up at all. Right now I just have it hanging down by the wires. I have 3d printed a mount that requires trimming the housing of the switch to fit it, but it will be kind of stubby in the steering column housing. Next I'm going to try a cruise control switch from a Matrix as the lever is a bit longer like the one my LC had from the factory.

 

[White Stripe]

Are you using a oem converter? Or aftermarket?

 

[Stuckinthe80s]

Are you using a oem converter? Or aftermarket?

Aftermarket, but it's CARB compliant. (if that makes a difference)

 

[White Stripe]

Aftermarket, but it's CARB compliant. (if that makes a difference)

I have a theory that the cat monitor measures how long from cold start that the cat starts working. For example say it takes 2 minutes for a aftermarket cat to start fully working compared to 1 minute on a factory original converter. The converter design and where it is located upstream or downstream as well as pipe diameter can affect this. This is only a issue on setting the initial monitor and a variance in converter activation time fron cold start by a fair amount doesn't seem to actually trigger a check engine light. Thus the pm I sent you a while ago. Once the device in the pm is installed and the monitor set, you can remove the device and the monitor should stay set and the check engine light stay off. Also I believe the original exhaust may be smaller than it appears. Many toyota exhaust systems have double wall pipe. Some I think have double wall with a heat shield encapsulation that has insulation which almost makes it like a triple walled insulated pipe. There seems to be about 1/4" space between each wall or more. So then the actual ID of the pipe where the exhaust gas is, is quite small compared to what it looks like from the outside. The other option is to use a smaller exhaust pipe diameter pre cat and post cat and a smaller or original converter. This would probably hurt power and gas mileage, but get the converter working faster. Carb emissions are a pain in the neck.

 

[Stuckinthe80s]

Thanks Mike! Everything you say sounds logical. I did try one of those, but that didn’t work either. However, I may try it again as I don’t know what else to do.

 

[Stuckinthe80s]

Went on a quick drive just now to play with the data logging feature on OBD Fusion. It's pretty cool, and I thought I would post my first attempt to show the O2 sensor voltage by MPH:

The truck wasn't fully warmed up yet when I started the data logging, but it was by the time I was slowing down at X-axis point number 71.

Here is the same chart with me trying to "zoom in" by selecting a different range of data to display:

It looks like the downstream sensors are bouncing around too much. I'm going to go on another drive to see if things change after everything gets nice and warmed up.

 

[White Stripe]

Do you have a graph that's rpm and voltage rather than mph? The torque app should work pretty well for this if not. But you need a obd2 Bluetooth adapter for it to work with a phone or tablet.

https://www.amazon.com/OBD2-Scanner-Adapter-Compatible-Diagnostic/dp/B0BRKJ38ZQ/ref=mp_s_a_1_36?crid=2AMO93VESTRIX&dib=eyJ2IjoiMSJ9.NIqV7QN4kNM2hfzb627SJ-RSc_LlqbMyMqikc1HleAnfsTeH6gmH7IN2ZBtxuBvmY5TbHN8giV2Ya450ISurRbhTQEtIc6h2gxOKepb9pI8Nptw1eIFqBVUNK1tLrR98uQDe2NBt4jO6Md5XKhJhliO-ATZqb3uJrvi8cg9qyDRPdq5sz4vSdCIhApF1utOz3i7Mp4MRkFl4L8cDLY41mA.r-P4lvTP4lsMhScoQpWFHGGJipt9PXkFNLuqY88pBuY&dib_tag=se&keywords=obd2+bluetooth+adapter&qid=1729971374&sprefix=obd2+blu%2Caps%2C138&sr=8-36

 

[Stuckinthe80s]

Do you have a graph that's rpm and voltage rather than mph? The torque app should work pretty well for this if not. But you need a obd2 Bluetooth adapter for it to work with a phone or tablet.

https://www.amazon.com/OBD2-Scanner-Adapter-Compatible-Diagnostic/dp/B0BRKJ38ZQ/ref=mp_s_a_1_36?crid=2AMO93VESTRIX&dib=eyJ2IjoiMSJ9.NIqV7QN4kNM2hfzb627SJ-RSc_LlqbMyMqikc1HleAnfsTeH6gmH7IN2ZBtxuBvmY5TbHN8giV2Ya450ISurRbhTQEtIc6h2gxOKepb9pI8Nptw1eIFqBVUNK1tLrR98uQDe2NBt4jO6Md5XKhJhliO-ATZqb3uJrvi8cg9qyDRPdq5sz4vSdCIhApF1utOz3i7Mp4MRkFl4L8cDLY41mA.r-P4lvTP4lsMhScoQpWFHGGJipt9PXkFNLuqY88pBuY&dib_tag=se&keywords=obd2+bluetooth+adapter&qid=1729971374&sprefix=obd2+blu%2Caps%2C138&sr=8-36

yes, here's some data from another drive I just finished with, showing rpm:

The first pic shows the legend, the grey line being engine rpm.

 

[Stuckinthe80s]

Here's a snippit from the data log above. (I'm trying to make this somewhat readable)

 

[Stuckinthe80s]

Saving the excel file here for archiving.

 

[Stuckinthe80s]

This is something interesting, although I don't really know what it means. The short term fuel trim for both downstream sensors is pegged:

Engine RPM (RPM)	O2 voltage (Bank 1 Sensor 1) (V)	Short term fuel trim (Bank 1 Sensor 1) (%)	O2 voltage (Bank 1 Sensor 2) (V)	Short term fuel trim (Bank 1 Sensor 2) (%)	O2 voltage (Bank 2 Sensor 1) (V)	Short term fuel trim (Bank 2 Sensor 1) (%)	O2 voltage (Bank 2 Sensor 2) (V)	Short term fuel trim (Bank 2 Sensor 2) (%)
594.5​	0.005​	0​	0​	99.21875​	0.01​	0​	0​	99.21875​
603.75​	0.005​	0​	0​	99.21875​	0.015​	0​	0​	99.21875​
592.75​	0.01​	0​	0​	99.21875​	0.005​	0​	0​	99.21875​
821​	0​	0​	0​	99.21875​	0​	0​	0​	99.21875​
1264.75​	0​	0​	0​	99.21875​	0​	0​	0​	99.21875​
1442​	0​	0​	0​	99.21875​	0​	0​	0​	99.21875​
924​	0.835​	-3.125​	0.745​	99.21875​	0.68​	-3.90625​	0.695​	99.21875​
651.5​	0.635​	0​	0​	99.21875​	0.025​	-3.90625​	0.055​	99.21875​
1029.5​	0.055​	10.9375​	0​	99.21875​	0​	8.59375​	0​	99.21875​
2024​	0.095​	19.53125​	0.145​	99.21875​	0.86​	10.15625​	0.825​	99.21875​
1158.5​	0.735​	3.90625​	0.205​	99.21875​	0.875​	-0.78125​	0.085​	99.21875​
830.25​	0.115​	3.90625​	0​	99.21875​	0​	0​	0.285​	99.21875​
779.5​	0.725​	2.34375​	0​	99.21875​	0.495​	2.34375​	0.005​	99.21875​
764​	0.095​	5.46875​	0​	99.21875​	0​	2.34375​	0​	99.21875​
2033.5​	0.845​	13.28125​	0.78​	99.21875​	0.84​	10.9375​	0.775​	99.21875​
2732.75​	0.855​	0​	0.89​	99.21875​	0.815​	0​	0.84​	99.21875​
2150​	0.85​	-6.25​	0.895​	99.21875​	0.65​	0​	0.885​	99.21875​
1073.25​	0.79​	-1.5625​	0​	99.21875​	0.8​	-4.6875​	0.005​	99.21875​
614.75​	0.075​	0.78125​	0​	99.21875​	0​	-2.34375​	0​	99.21875​
581.25​	0.06​	1.5625​	0​	99.21875​	0.695​	1.5625​	0​	99.21875​
583.5​	0.27​	2.34375​	0​	99.21875​	0​	5.46875​	0​	99.21875​
597.5​	0.81​	3.125​	0​	99.21875​	0.03​	4.6875​	0​	99.21875​
592​	0.665​	0​	0​	99.21875​	0.36​	3.125​	0​	99.21875​
595.25​	0.555​	1.5625​	0​	99.21875​	0.77​	0.78125​	0​	99.21875​
601.5​	0.775​	0.78125​	0​	99.21875​	0.1​	0.78125​	0.01​	99.21875​
590.5​	0.7​	0.78125​	0​	99.21875​	0.73​	0​	0.02​	99.21875​
590.5​	0.575​	0​	0​	99.21875​	0.095​	2.34375​	0.03​	99.21875​
595.25​	0.195​	1.5625​	0​	99.21875​	0.055​	0.78125​	0.03​	99.21875​
588.25​	0.175​	0​	0​	99.21875​	0.03​	0.78125​	0.03​	99.21875​
1893.75​	0.815​	-3.125​	0​	99.21875​	0.855​	13.28125​	0.71​	99.21875​
1944.5​	0.13​	5.46875​	0​	99.21875​	0​	11.71875​	0​	99.21875​
2740.5​	0.125​	3.125​	0.06​	99.21875​	0.095​	1.5625​	0.545​	99.21875​
2297.5​	0.75​	-1.5625​	0.385​	99.21875​	0.615​	-3.125​	0.56​	99.21875​
1694.5​	0.83​	12.5​	0.07​	99.21875​	0.83​	2.34375​	0​	99.21875​
1144.5​	0​	0​	0​	99.21875​	0​	0​	0​	99.21875​
945.25​	0.8​	-5.46875​	0​	99.21875​	0.025​	-3.125​	0.005​	99.21875​
752.25​	0.76​	1.5625​	0​	99.21875​	0.005​	-3.90625​	0​	99.21875​
1775​	0.82​	2.34375​	0​	99.21875​	0.06​	16.40625​	0.03​	99.21875​
4040.5​	0.835​	0​	0.855​	99.21875​	0.89​	0​	0.9​	99.21875​
3371.75​	0.815​	0​	0.85​	99.21875​	0.815​	0​	0.855​	99.21875​
4040.5​	0.83​	0​	0.88​	99.21875​	0.795​	0​	0.855​	99.21875​
3114​	0.8​	0​	0.84​	99.21875​	0.755​	0​	0.84​	99.21875​
2303​	0.715​	1.5625​	0.685​	99.21875​	0.725​	-3.90625​	0.685​	99.21875​
2264​	0.755​	3.125​	0.6​	99.21875​	0.105​	-3.90625​	0.625​	99.21875​
2258.5​	0.775​	-7.03125​	0.685​	99.21875​	0.745​	-3.90625​	0.185​	99.21875​
2275​	0.74​	-14.0625​	0.8​	99.21875​	0.075​	3.125​	0.33​	99.21875​
2275​	0.785​	-14.8438​	0.82​	99.21875​	0.22​	-3.125​	0.49​	99.21875​
2247.5​	0.815​	-1.5625​	0.845​	99.21875​	0.685​	0​	0.08​	99.21875​
2215.5​	0.775​	-10.1563​	0.845​	99.21875​	0.665​	-1.5625​	0.085​	99.21875​
2200​	0.715​	-10.9375​	0.105​	99.21875​	0.725​	3.125​	0.08​	99.21875​
2215.5​	0.2​	-14.8438​	0​	99.21875​	0.615​	-2.34375​	0.21​	99.21875​
2195.25​	0.665​	-8.59375​	0​	99.21875​	0.135​	0.78125​	0.495​	99.21875​
2144.5​	0.685​	-19.5313​	0.09​	99.21875​	0.71​	-3.125​	0.58​	99.21875​
2150​	0.605​	-2.34375​	0​	99.21875​	0.72​	2.34375​	0.185​	99.21875​
2115.5​	0.46​	-10.1563​	0​	99.21875​	0.045​	-3.90625​	0.105​	99.21875​
2050.75​	0.3​	-3.125​	0.59​	99.21875​	0.185​	4.6875​	0.14​	99.21875​
2060​	0.775​	0.78125​	0.81​	99.21875​	0.7​	-3.125​	0.56​	99.21875​

 

[Stuckinthe80s]

Went for another drive, came home and let it idle for a bit.

You'll see that bank 2, sensor 2, dipped down at idle and fluctuated at a low, which looks normal. However, bank 1, sensor 2 was fluctuating, then went to zero. It stayed there, at zero, the rest of the time it was idling. I don't know if that's good or not.

I let it sit for a while, then cranked it back up to let it idle some more. You can bank 1, sensor 2 (green line) started at zero and stayed there. I'm wondering if something is going on with that sensor or wiring?

 

[White Stripe]

Went for another drive, came home and let it idle for a bit.

You'll see that bank 2, sensor 2, dipped down at idle and fluctuated at a low, which looks normal. However, bank 1, sensor 2 was fluctuating, then went to zero. It stayed there, at zero, the rest of the time it was idling. I don't know if that's good or not.

I let it sit for a while, then cranked it back up to let it idle some more. You can bank 1, sensor 2 (green line) started at zero and stayed there. I'm wondering if something is going on with that sensor or wiring?

Ya I think your on to something. Maybe try swapping secondary sensors left to right and see if the issue follows the sensor or if the issue stays on that side. When your testing o2 voltage, keep the rpm fairly constant. Check at idle and at cruising at a fairly constant rpm.

 

[Stuckinthe80s]

Haven't switched it around yet, but wanted to post a graph showing just bank 1, sensor 2 going through a few different rpm ranges. I tried to hold steady at a few different rpm's to see how it would react:

 

[Stuckinthe80s]

IT'S FINALLY F_ING READY!!!

After looking at the voltage staying at zero at idle on bank one, I did the googles and realized that means a lean condition. A lean condition can be caused by an exhaust leak, so I pulled that section of pipe to inspect it. Looking at my shitty weld job on the #2 sensor bung, I saw a pin hole in the weld.

I wasn't sure if it was all the way through, so to check it, I taped off the bung hole (huh huh, bung hole) and the other end of the pipe, stuffed some paper towels in one end an lit them on fire. The smoke immediately started spewing out of that hole, and confirmed what I was worried about. So, I whipped out the welder, popped a little bead on it, put it back together and ran it at idle again. I immediately saw the downstream settle down and mimic bank 2, so I thought I'd take it on a drive.

I performed the drive cycle, and before I got to minute 5 of the 7 minute cycle, the monitor kicked over to ready!

This just goes to show you that emissions isn't some black magic, you just have to pay attention to the details. A big thanks to @White Stripe for sending me information on using O2 data to trouble shoot and for getting the brain juices flowing. I feel silly for not troubleshooting more sooner, but at least it's finally done.

Holy shit this feels so good!!

 

[Lastresort576]

Congrats man! Does this mean it’s ready to get tested and be road worthy?? So awesome

 

[Stuckinthe80s]

Congrats man! Does this mean it’s ready to get tested and be road worthy?? So awesome

Yes, it should. Now I just have to put the dash back together and schedule my inspection.

 

[IoN6]

(huh huh, bung hole)