I recently just replaced my spark plugs for the NGK GTR sparks and some z1 high ignition coils. After this job I took it on a test run and everything seemed fine I had more throttle response — however towards the end of the drive I experienced some weird shifting then when sitting at idle for one minute (I ran inside my house to grab something and came back), my engine “spuddered” off (according to my homie who was outside) and my fans were still running.
- turns out we had two different ground wires loose.
- we checked all the fuses (visually) and they seemed fine
- no leakage or any sort of other harnesses being lose
- When trying to start my car it goes no further than turning on all the electronics but there’s no crank, no tick when trying to start the engine.
- tried reading a code with a scanner but while the scanner turned on, it couldn’t read the car.
Im pretty sure the loose ground wires fried the ECU, every time I turn on the car everything but the engine turns on, even the fans start running but no crank.

 

ALL the fuses?
even the ones in the IPDM?
No power at the obd port points to a blown fuse.
hopefully it did its job and protected your ECM

 

yep, all of em. Used a fuse tester to check every single fuse and they’re all fine. OBD2 turns the scanner on but no reading.

 

what did your problem end up being? i am having this same issue after doing an engine swap. my new ecu’s keep on frying and then the same thing. the fans turn on but the car won’t crank. the car drove 200 miles and then this started happening

 

did you every fix the car?? I just did a engine swap and how do you know the ecu is fried
my scanner turns on but says error
everything works electronically but car won’t crank
Fuel pump isn’t priming
I just cleaned my bcm to see if that would work but it didn’t

 

yes!!! i was able to fix the car it was my alternator. i had a 2017 nissan 370z alternator in my 2008 g37s coupe and it was causing my ecu’s to fry. i put my original alternator in and a new ecu and got it programmed and she’s been back ripping ever since.

 

just ordered my new ecu and have a new bcm aswell the ecu from flagship comes plug and play programmed hopefully it works I still have my old alternator aswell