EFIDynoTuning Forum

NP :) Def not hijacking your thread. It made more sense to add my issues here since they're similar vs. creating a 2nd post. So I fixed the injector wires. The result was I ran very lean after. I figured I'd be running rich but whatever. So I had to re-tune. I got it more or less close for the 34 mile run home but it still crapped out on the highway after about 10 miles and sure enough the moment I hit a small incline. I picked up my new O2 sensor (I wanted to test 1 thing at a time ) and installed it. Afterwards my MAF tuning was way off again running extremely lean to the point it was crappin out immediately with any acceleration. I could feel it was starved of fuel too.
I adjusted the MAF tables to accommodate and now it's running a lil too rich but she hauls ass again! I gotta do a lil more tuning again after the O2 sensor change but this made a huge difference.
I swear after my history w/ O2 sensors, dropping one from chest height on the ground will kill an O2 sensor.
I'll report my final conclusions after more testing but hopefully this story helps you/someone else :)

I've had this issue before and I'm having it now. I'm thinking it's a combination of power to fuel injectors AND an O2 sensor issue. The original issue years ago was fixed w/ just an O2 sensor but the fuel injector wiring might still been a problem. What stands out for your issue is your graphs and the odd changes in the voltage.... It's a bit of a story but here's where I am:

Years ago it was basically a stock 302 w/ MAF. It would race around NP but when it came to any hill it would starts boggin out and eventually could barely limp. I just pulled over so didn't give it much time to die but I'm certain it would. Even when getting back to all flat road, if this issue happened, it would never recover until I shut it down for about 10-15 minutes. 1st time she ever went to a mechanic and they said she had a broken cam...
I just replaced my O2 sensor w/ a brand new Bosch but I dropped it from like 6 inches before this issue started. I read the box and it said DO NOT DROP IT!!!. A 6" drop can't hurt an O2 sensor!!! BS Yes it can! >:( A new O2 sensor fixed it and I was VERY careful not to drop it :)

Now I've got a brand new everything which should be in my sig and this issue is back. It's all tuned really nicely and hauls ass! Until I hit a f'in hill..... Now I can monitor things w/ QH/TunerPro and I see my A/F Err correction go way out of bounds and keeps going even when I hit a flat road. It runs lean and keeps getting worse until I shut down for a bit then it's happy. ECT is 178-180 solid too.

I also have a brand new Bosch O2 sensor and it did slip out of my fingers installing it from about 6inches above the ground again....
Also my MAF conversion was soldered in beautifully over 20 years ago and the solder joints still look beautiful. PO def did a solid bench job. I checked continuity on either side of the joints and the continuity was very low despite she can haul ass. One injector wasn't working at all which is why I discovered the wiring issue. It would barely light up a noid/test light.

I fixed the 1 injector's wiring and the noid light lights up the whole garage now. I did not bother with the others tho. I was able to get everything tuned and running AWESOME!!! (more fine tuning left) and that's when I began the hill tests and failing again...

Now I can see stats w/ the tuner, I figured it was going into some Open Loop Limp Mode but it doesn't; it's Closed Loop the whole time. I'm using Decipha's default log data set too.

To your graph concern and possibly the relation to my issue, I see the mVolts for the injectors (running state/bottom graph) typically is very mountainous and constantly changing when it's happy but when it craps out, it's more hills and valleys with extreme changes WHEN it does change. I also see the Volts for the O2 sensor (Dyno/top graph) react at the exact same time so mountainous or hills/valleys, both O2 and Injectors coincide all the time. When it craps out, it tends to be extreme variances vs. normally they tend to sit "somewhere in the middle". I posted 2 graphs below, 1st is when it craps out, the 2nd is when it's running normal. I have a lil more fine tuning w/ MAF AD Counts but you can see it's pretty good.
I wonder if you see something similar?

Current Theory at least for me: My O2 sensor probably failed due to the VERY short drop AND my injector wiring is heating up more on the hill due to load and killing the power connection.

Fortunately I got my QH and an extra F3v2 chip a few months before they listed everything out of stock :)

As I understand it the EPA has shutdown several tuners like COBB. Moates has no tuning hardware to sell for Ford anymore either.
Are you saying this is incorrect? Honest ?

So the tuning world just had a massive hit thanks to the EPA. How does it feel?

Are the injector wires good?

After a couple decades of log/trend/performance analysis in the IT Security space, yep, no F'in way was I gettin this tune done right without having the simple/logical MAF transfer table column to adjust based on the log history :D

Dialing this in just got a hell of a lot easier. Before I can see it would've been a never ending fight. Now I'm riding very close to 1.00 in all AD count ranges I've hit. Good call!

I extended your definition file for the N_IMAF_IEGOs (I know I can use IEGO1 since I only have 1 O2 sensor but meh) to 15 columns up to 4500 RPMs which gave some more helpful data for me. I'm on 35" tires and 5.13 gears so over 3K RPM is not unusual which was where the cut off in the definitions is. 2K is like my average cruising RPM with the tires/gearing. Not complaining either, just sharing ;)

It shall be done :)

I tried 9999 and it converted it to 3200. I figure this compensates for a critical failure like setting 16+V because I have seen batteries over charge to 16.8v before due to a bad regulator/rectifier.
If you are confident on that hard limit at the code level, then I'll gladly add 1 extra point of resolution.

I know you read these and your time is valuable so I'll go with no reply means,
Yes, do it ;)