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Hey, I have a '97 M-Edition that is not turbo for now. I installed a Wideband (AEM UEGO X-Series) and a GM IAT sensor from DIYAutotune. The ECU is a DIY MS3X. I followed Brain's guide for making the board, and loaded his map for 1.4.1 FW, correcting anything that didn't quite match up in 1.5.1 FW that I have installed. The car cranks, and I've got good battery voltage, and I have fuel for sure because I can smell it. I'm not sure if there's an obvious direction to go based on the logs, but it's probably something I'm overlooking.
I'll keep an eye on the post and try to get back super quick. Let's get this working!
I reloaded the base tune from TruboKitty, and corrected the Baro settings for the higher firmware I'm on. Also, I know I'm getting spark because the light on the MS3X is flashing. I tried arbitrarily turning up REQ_FUEL, but I went up from 11.4 to 20 and nothing changed. I also tried Batch Fire During Crank, to no avail. I'm really feeling stuck because I thought it should just turn over, since the car is stock.It doesn't stumble or anything, just keeps cranking but not turning over at all. I'll update the post when I change something.
Linked my tune for the updated firmware in case the update messed with something other than baro.
I've been working on it, and I'm wondering if I can retard the timing temporarily in hope that it's just super advanced right now. I also saw a setting called cranking taper curve. It looks like this might be an easier way to test, but I don't know what reasonable values are for this. I've watched just about everything I can on YouTube about tuning, and I must be missing something obvious that people just don't document. Something that occurred to me is that maybe the TruboKitty map I downloaded is for turbo cars - that would kinda make sense. But the numbers appear to be for an NA car with my limited knowledge. I don't know. Doing more research on the forums today. Really hope I can get it working before tomorrow when it's 85 out.
So I became tired of not getting any response on here, and went to flash firmware 1.4.1, in order to make sure there were no weird bugs in my way. I come to find I can't even connect to the MS3X. It detects the port it's connected to, but the Megasquirt firmware flashing software can't find it. I believed this indicated a CPU problem, but I wasn't sure. I opened it up and looked at the board to find that PIN37 of the Megasquirt connector had blown the trace out of the board. I repaired this, soldering in a jumper from the connector to the point where the solder had stopped being blown out. Still nothing. I think the damage was done when I wired up my Wideband O2 to an incorrect power source. It must have just been holding on. I'd like to look at the possibility of sending it to Peter Florance, if he's still offering his services, purely since I don't think this problem has been documented anywhere. I need to go through the tests that were posted on the thread "Who do I throw money at to test a dead MS3X?" before I do. We'll see what happens. The only direction to move is forward.
My repair... a little less yikes. The blown trace... yikes.
It turns out that a 22v zener diode had shorted out somehow, and Q2 transistor was somehow missing. I sent the ECU to Peter Florance of PFtuning in VA Beach, and he had me fixed up in a couple days for a very reasonable sum considering how much I saved by building the MS3X myself. I plugged it in yesterday and the fuel pump worked again, and it's very close to starting. I have another thread posted now about my issue with that, but it's closer than it's ever been.
03-26-2020, 06:50 PM
Another Crank But No Start Post
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