Earlier today I started having an issue and I'm at a complete loss of where to start. When my jeep is under a heavier than usual load, such as driving up a ~25-30° grade or having to accelerate a bit more heavily through a mud hole, it's started to sputter and surge, and lose power to accessories such as the radio, fan blower motor, and wiper blades. I've replicated the issue twice but can't reproduce it while in Neutral. It seems like it wants to start sputtering around 1750-2000rpm. I don't currently have a way to read any data from the Renix system other than what's provided by the dash cluster or using a multimeter.
Jeep is modified but motor/trans/tc (4.0, AW4, NP242) is mostly stock. It's running 4-hole injectors, and I recently installed thicker gauge battery and ground cables to prep for a larger alternator for future accessories. After installing the cables I did start having what I believe to be a miss occasionally on startup that fades within 30s, but I haven't been able to confirm what that is yet.
Not sure if this question belongs here or in non-modified, but I'll start off here. What things should I check to try and resolve this surging and acc power cutout?
Brown wire at ignition switch supplies power all the functions you mention.
I did some toying while driving down the access to my job site and found that it's only happening in full-time 4 and part-time 4, I couldn't check 4L because my linkage is sloppy. 2wd I can rip and romp to my heart's content and it won't sputter or kill accessories.
Even still, should it be that wire would it cause the engine sputtering? I was able to get a video of that today. I'll get that uploaded to YouTube and drop the link as soon as I can.
EDIT:
Fix known problems that might be a contributor to the issues.
If it was a known issue prior to 10 minutes ago it'd have been fixed, that's why I came to ask for help. Could that be a contributing factor or should I be looking elsewhere in the meantime? Seems pretty odd that it would only happen in 4wd if it were that.
