Did you let the autotune adjust while at idle? Recalibrate the WB. It seems like the ecu isn't getting wideband input so ur afr/ve tables must be whacked. I can't open the file u attached. It just shows a bunch of numbers and letters on a white page. Im using a mac.

if your AFR gauge is reading 22, then it's not working correctly. that means no fuel.

REQ_FUEL was a set and forget thing. it's literally a multiplier on the fuel table.

i had you add/subtract it to see if you were too rich/lean for initial startup. You should only have to change the number if you changed injectors, and then it's simply math to figure out what to change it to. You need to go back to the initial number that was loaded in it. a REQ FUEL of 25 means the MS is injecting a crap ton of extra fuel (twice what it was set up for), so your fuel table is going to look really small compared to most others to compensate.

If your air/fuel gauge isn't reading correctly in tuner studio it will NOT autotune correctly.

I did let it autotune at idle but only for 2 or 3 minutes. After reading all the replies it probably didn't work because I need to re-calibrate the MTX-L. No worries on the data log. Thanks for the help!


I didn't realize it was a set it and forget it thing when you first told me, then I had a phone conversation with someone from evil genius racing, and they said to throw fuel at it, without double checking the manual, I made the assumption that the REQ FUEL was the area I needed to adjust fuel. After searching around and reading some of your old posts I learned what REQ FUEL really was and that it takes the base pulse width, and the table is scaling that number, I have since changed it back to 13.2 and I have been working from that number. The autotune I did last night with the non working AFR gauge was with the REQ FUEL at 13.2. Thank you for the explanation. I'd seriously be lost without all the help you've given me.

Thank you, this is what I needed to be told. I had switched my battery out during the 2 month sitting period, I probably need to re-calibrate due to that. I'm an idiot lol. I am going to re-calibrate today, and start over. Thank you for telling me this.

So I re-calibrated my sensor. I then got into autotuning and at first my gauge was reading around 12, then slowly as the car warmed up and sat for about 7-10 minutes the AFR gauge started going higher and higher until it reached 22.4, and couldn't start without some throttle.
I went back to the tune I had saved yesterday, and it started up fine, but the gauge is now reading 22.4 and at idle it's running okay, but when I give it a small amount of throttle input the car wants to sputter and then it dies. I can see the autotune changing cells like crazy once again, but my gauge it still at 22.4. I saw the gauge change from 11ish all the way up 20 and it was changing numbers based on the autotune... Should I recalibrate it again?

thats weird. So its thinking that u have way too much fuel and is going lean I assume. have u looked at accel. enrichment?

No I haven't. All I did was go into the VE analyze and click start tune. When it was running pretty well I clicked apply, that made the car sputter and the autotune started adjusting harder. Is there a resource or a step by step on what I should do? I've read things on the forum about turning settings off for idle/warmup, but I have no clue what I am doing lol so I don't want to start messing with things that could mess up the tune, I also don't know what settings I should be looking at to see what I can affect safely.


Checked settings, mine are:
accel-pump AE
EAE
off

You need to add more fuel. But you also need to figure out why it is going lean. The ecu isn't adjusting properly obviously. Is your car boosted?

No it's totally stock. I do have a cat back exhaust, and I installed a brand new MTX-L,and the MS3X came with the AIT. How would I go about adding more fuel?

do it in your VE table. change the number(s) desired until your AFR smooths out

Are your mtl-x gauge and your tuner studio gauge reading the same a/f. until they are don't autotune or drive the car.

^ true

They were not reading the same. Tunerstudio seems stuck on 7.8/7.9. Is there a setting I need to check to get that all set up correctly? should I recalibrate my sensor again?

try recalibrating and see what happens

I would guess that the 7.8 in tuner studio and the 22 on your mtl-x are default error settings. You must figure that out before you continue. Double check your wiring.

I recalibrated it. It seems to work better now.


I took a short video to show what I'm seeing on the gauge and tunerstudio side by side. Do you think this is a wiring issue?

Probably a configuration error.

Maybe a wiring error.

Any suggestions on where I could look to fix the configuration?

Also I should have mentioned, since the AFR's were only out of range by 2 points I clicked autotune to see what would happen, under active filters it was yellow and said o2 out of range. I don't know if that piece of information is helpful or not, considering we already know they are out of range.

Tools -> Calibrate AFR Table

Select the correct sensor

"Only out of range by 2 points"?

2 points will blow your engine in boost. Easily.

Thanks for the info it sounded pretty imperative to learn.


I followed the instructions I found here :https://www.diyautotune.com/support/...novate-config/
I set it to the lc-1/lc-2 option.