intenseapple

Car:
Turbo 1995 with Rev built MS3PnP. Built motor, LS coils, stock ignition trigger setup (CAS).

Issue:
ECU occasionally RESETs, not sure why as I haven't seen any clearly related events in MLV. A few of the RESETs in the attached log happened right after small to medium spikes in voltage, which might indicate a grounding issue? Anyone run into this before? After looking at some previous logs, it looks like I have been intermittently having the issue for a bit now but assumed it was boost control cutting in as I hadn't tuned it yet.

Data:
Attached are my current .msq and a .mlg of a short drive

Notes:
Wideband went out recently, I promise my AFRs are okay
No composite log right now, will be getting one ASAP to see if it is a sync issue
Lastly, feel free to bully for my tune, I am nowhere near an expert (yet)

cpierr03

Have you inspected and cleaned all your grounds? Especially the big strap on the PPF?

intenseapple

I have not, I'll be taking a look at it today though. I just swapped in a 3.636 diff and potentially stretched or somehow messed up that ground on the PPF frame in doing so, which explains the more frequent resets. What's the best way to clean it up?

intenseapple

Reviving this thread because the random RESETs under high load/RPM have returned. They are hard RESETs, as in you can feel the car jolt as the MS3 restarts. I just switched from using D581 to D585 (LS2) coils and I think that they might be the culprit. They are, unfortunately, the poorer "black epoxy" D585s but are genuine AC Delco parts. Switching back to D581s this afternoon to test further.

Now I'm wondering: Why would new coils cause my MS3 to RESET like this? I've noticed a spike in battery voltage to around 14.5V right before the RESET, could this be the cause? Tune and log file with multiple examples of RESETs are attached.

intenseapple

Another update: I finally decided to dig into the LS coil wiring harness provided with the kit I bought (custom and used). Sure enough, there were some major issues. None of the coils had a signal wire ground, only a power ground. This ground went to back to the ECU through what should have been the signal ground rather than to the ECU. I am amazed that the car ran at all like this, but it would explain the numerous problems I have had at high RPM/load with this setup. New pigtails are on the way and hopefully a redo of this harness fixes my issues!