astriskc

Hi. Long story. I have a 2013 F30 335i with the PWG N55 engine. The engine blew and I got it replaced with a 2015 EWG N55 engine. I got it back from the mechanic and it was running, but running rich and no boost, you could tell the car was unhappy. My assumption for no boost and running in poo conditions was that it was running with the old PWG DME and a PWG tune, which may not have had the hardware and logic to run electric wastegate. Little did I know that my mechanic had supposedly not plugged in the electronic wastegate plug as he misheard me for saying to unplug the diverter valve to I get compressor surge since I want the turbo flutter sound. (yes, I know it's bad for the turbo, I just want it for purely sound). So I go home and attempt to flash the car on a PWG tune just to see what happens. The bootmod3 OTS tune cannot successfully be flashed on the car, so I assumed I needed a new DME to run the hardware for the car to be alright. Now luckily, I have a friend with a blown M235i. Both my friends car and my engine are 2015 EWG N55's, only difference is his is a convertible. That's literally it. So I grabbed his DME, got it cloned from my old DME so the ISN align, and I attempt to start the car. Only cranks, doesn't start. I somewhat expected this since I thought I would have had to reflash a tune on it anyway, but still thought that it could have started since both DME's (my old PWG DME and my friends new EWG DME) were running on stage 2 tunes. Different platforms however, his on MHD and mine on bootmod3. Now here's where it gets complicated. The person I went to get my ECU cloned said that they have no choice but to clone everything, not specifically the ISN and VIN alone, so I was thinking the new DME was currently running on an incomplete map which makes sense as to why its not actually turning over and simply cranking. However, after contacting bootmod3 support and getting them to switch my maps from PWG to EWG, after attempting to flash the tune, it fails specifically at 87%. Every single time. No exception. So after doing miniscule troubleshooting here and there, turns out my battery was exceptionally low on charge. So I went and replaced it with another battery, same spec, AGM, 85ah, only thing about the new one was I bought this new one the moment my engine seized, about 4-5 months ago, so it had just been sitting in my friends garage ever since. Now this is where it gets bad and my impatience really starts to show. I can't exactly remember if either ECU cranked after the battery swapover, to the best of my knowledge, I think the last crank attempt that car had was on the new battery on the EWG DME. Anyway, I was swapping over both DME's repeatedly trying to flash the EWG tune to atleast see if either one of the tune's would go through, also I was hooking up jumper cables to my other car, putting a jump pack on the car aswell, I could hear the relays chattering aggressively, it was really a mess. It ended up at a point, which is still where I am now after 2 days, where no matter what DME is in the car, no matter the voltage of the battery, it simply does not want to start. Since then, my theory is that the reason the tune did not successfully flash, and made sense as to why it would fail at 87% specifically on both DME's, is due to the wastegate plug being unplugged, which to my knowledge is a critical sensor that the DME requires to have communication with when flashing a full flash. At this point, it could be anything. I'm guessing something electrical, but I have no idea what it could possibly be. The new battery (the one that was sitting for 4-5 months) I bought a battery charger for, was resting at about 12.5v, currently sitting at about 12.2v, is enough for atleast a crank attempt but nothing. As soon as I attempt to get the car to start, the dash just turns off. Currently, the car in ignition cycles through (according to my memory) an ABS code, a tyre sensor code, a fuel supply code, and some other code. I cannot remember those codes cycling through when the car was just given back to me. Only code that I can remember is a drivetrain malfunction code, that was there since it was given back to me. My mechanic assumed it was just because of the boost problems which the tune should fix. Not sure how he thought it was okay to give the car back to me with the wastegate unplugged, but thats besides the point. I genuinely have no idea why the car isn't even cranking. A bad tune should allow cranking, low voltage should allow cranking, error codes should allow cranking, I don't understand. It's important to mention that after looking around for the wastegate plug, it seems as if it's plugged in. Not sure if I'm looking at the right thing though, I'm 90% sure it's plugged in though. bootmod3 displays no codes or faults. I would really appreciate the help. I've dropped so much unnecessary money on this car and I atleast want it to drive. Thanks.