Hey guys, so back in late November I purchased a '12 G37 Journey Sedan with what is now 51k miles. It started giving me trouble turning over a week or two in (just randomly like I had a weak battery). I changed my battery and did the ECU reset but when I went to turn it over it took a while and idled real rough and shook before finally shutting off on me. I was told I should change my air filters and MAF so that was also done, but when I went to turn it over it just straight refused. May even have misfired on me when trying to turn it over the second time.

No CEL or anything so I'm very confused. Any help would be greatly appreciated

 

Try cleaning the throttle bodies? That seems to be a common solution for non-electrical starting problems.

 

I have a '12 as well and have a very similar problem from time to time. For me it has been an issue of on the previous start the car is only running for a very short time in cold weather before I turn it off. As a result the choke is on and the fuel mixture is very rich and doesn't want to re start. It's only happened a couple times. Once it finally starts, runs fine after that. I'm always careful to let it run for a couple minutes on a cold start and hasn't been a problem since. Great car, I'm sure you will love yours. 80k troublefree miles.