DIYPNP not reading AFR from AEM WB02
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I have seen a lot of threads similar to this, but nothing quite like this.
1990 with DIYPNP built by me. 94 engine with turbo and RX8 yellow top injectors. Starts and runs with basemap, but runs pig rich and eventually stalls. Req fuel has been adjusted for the 420cc injectors. AFR table looks ok, I look at fuel table. I bump it down 10 points across the table (5 points at a time) and that helps it run longer, but it still eventually runs rich and stalls. If I remove too much fuel the car runs really lean and won't start at all. I bump the fuel back up. I use VEAnalyze but strangely, the numbers don't seem to change at any point in the rev range. I go to calibrate AFR. As we all know the AEM WB02 gauges are a total motherfucker to calibrate and I try a range of settings. But no matter what I do, the AFR gauge in tuner studio does not change while the car is running. So Tunerstudio always shows an AFR of 10, even when the gauge shows leaner by several points. I can get Tunerstudio to display a different AFR by changing the voltage settings in the AFR calibration window, but Tunerstudio's AFR gauge does not react or change when the car is running. Thinking the gauge could be off, I test voltage output. It's within spec. (here's a neat link for testing your AEM gauge: DIY Testing AEM wideband gauges/sensors ) So it seems the ground is ok. It's grounded at the harness at the ECU on the black/green wire. I'm wondering if I have the white output wire from the AEM going into the right place at the ECU. I've tried both 2P (red/green) which is what flyin' miata suggests in one of their PDFs, and I've tried 2N (red/blue) which is what is identified in the m.net garage section somewhere. I have links if you want. Both 2P and 2N produce the same result - Tunerstudio still doesn't ever change its AFR. Which would jive with VEAnalyze never doing anything - if it can't read AFRs I don't think it's going to adjust. I guess it could also be the Bosch O2 sensor unit itself, I haven't tested that. But it was brand new. What am I doing wrong? Tune file attached. |
Your idle cells look very low. Are you sure it runs rich?
Just a pick a port under EGO Settings and feed the wideband output to it. |
Originally Posted by Akina_Downhill
(Post 1445729)
Your idle cells look very low. Are you sure it runs rich?
Just a pick a port under EGO Settings and feed the wideband output to it. When you say "feed the wideband output to it".... how's that? Thanks for replying! |
And yeah, AFR is 10 on the gauge itself. You can smell the unburnt fuel in the exhaust. It runs really rich.
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Do you have a map Hose connected?
Have you tested ignition and fuel on test mode? |
Yes, the hose is connected to the Megasquirt and is routed to the recommended place near the FPR, tee'd into the line. I'm not familiar with test mode. I did get the car to idle last night by adjusting the fuel at low RPMs as you suggested. Tunerstudio still shows an AFR of 10 no matter what else I do in EGO Control settings or anywhere else. I'm wondering now if maybe I did a pull-up wrong when assembling the unit. I know I can keep playing with the fuel table to have a driveable car, but I'm hoping to get this AFR reading issue sorted out so that VEAnalyze Live can see actual AFRs and consult the AFR table to correct fueling for me. Obviously I'm not super great at this tuning business so I thought I'd get the software to help me out. Unfortunately since it's not reading AFRs correctly I'm just sort of bumbling around.
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I'm having the same issue my my car. 1993, with a MSPNP2 and Innovate MTX-L WB. The gauge in tunerstudio stays at 10 no matter what fuel load or RPM even though my actual AFR gauge reads different. Gauge is grounded at the engine, timing is good, TPS is good, MAP line is good, but I'm also running pig rich (low 12s at WOT, mid 13s at idle and cruise)
Could it be adjustment of the TPS is needed? |
I don't know much about RX8 injectors, but I hear the dead times on RX7 ones were extremely picky and have to be perfect to run smoothly
Could your req_fuel be incorrect for the injectors? Did you calibrate the afr in TS properly? |
instead of randomly connecting wires to random places, why don't you figure out exactly where your DIYPNP is wired to accept the wbo2 -- then connect to that?
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Originally Posted by Braineack
(Post 1446096)
instead of randomly connecting wires to random places, why don't you figure out exactly where your DIYPNP is wired to accept the wbo2 -- then connect to that?
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Originally Posted by itsbendavid
(Post 1446028)
I'm having the same issue my my car. 1993, with a MSPNP2 and Innovate MTX-L WB. The gauge in tunerstudio stays at 10 no matter what fuel load or RPM even though my actual AFR gauge reads different. Gauge is grounded at the engine, timing is good, TPS is good, MAP line is good, but I'm also running pig rich (low 12s at WOT, mid 13s at idle and cruise)
Could it be adjustment of the TPS is needed? Where do you have your WB hooked up to in the harness? Which wire? I have tried a couple, as I posted above. It seems like we're just missing a simple piece of information here that someone could easily provide. |
Originally Posted by WigglingWaffles
(Post 1446039)
I don't know much about RX8 injectors, but I hear the dead times on RX7 ones were extremely picky and have to be perfect to run smoothly
Could your req_fuel be incorrect for the injectors? Did you calibrate the afr in TS properly? |
why are people connecting widebands to oem wiring harnesses? what am I missing here?
every..single...ms unit ever made has a specific wideband input that you can use specifically for this |
Seen this a few times before
Odds are you have the old narrowband sensor connected as well as a break out for a wideband. Disconnect the narrowband and see if it helps |
Originally Posted by Liquidog
(Post 1449159)
It's not random, I researched it. The DIYPNP is set up for a 1990 harness, and I have two conflicting sources of information telling me where the O2 sensor comes in on a stock 1990 harness. I'm hoping someone can verify for me where they have their WB02 connected on their 1990 harness. In the meantime, I'm going to pull my DIYPNP unit and verify that the O2 connection in the unit is good.
I could put a wbo2 input on the purge canister solenoid if I wanted to... |
Originally Posted by Braineack
(Post 1449172)
it is random until you open up the unit that someone built and see EXACTLY where the wbo2 input is wired.
I could put a wbo2 input on the purge canister solenoid if I wanted to... |
Originally Posted by 18psi
(Post 1449163)
why are people connecting widebands to oem wiring harnesses? what am I missing here?
every..single...ms unit ever made has a specific wideband input that you can use specifically for this |
I'd say unless you plan to use the unit with the stock narrowband at some point, just yank it out, figure out where your wb input is, and run it separate and not through the oem harness. This way you can easily troubleshoot, and have a strong, clean, uncompromised input to the ms from the wb.
Getting ahold of Braineak is impossible. Just leave a message with one of his cats :likecat: |
Originally Posted by YeboGoGo
(Post 1449164)
Seen this a few times before
Odds are you have the old narrowband sensor connected as well as a break out for a wideband. Disconnect the narrowband and see if it helps ahhhh ok. I'll check for that too while I'm in there. I don't think I understood that I needed to pick and choose which one was connected. I probably did both and have been sending the WB gauge signal into the narrowband connection, where the DIYPNP isn't looking for it. My confidence level while building the DIYPNP fluctuated between "this is simple, I can build computers, this is easy" to "OMGWTFBBQ HOW DO I MAKE A WIRE TALK TO ANOTHER WIRE" |
Originally Posted by 18psi
(Post 1449185)
I'd say unless you plan to use the unit with the stock narrowband at some point, just yank it out, figure out where your wb input is, and run it separate and not through the oem harness. This way you can easily troubleshoot, and have a strong, clean, uncompromised input to the ms from the wb.
Getting ahold of Braineak is impossible. Just leave a message with one of his cats :likecat: Also, lol @message with cat. Maybe I'll send my cat over with a tiny scroll or something. |
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