It's been several years since I had a new Gm car with a supercharger and had to run 93 octane. Everything was fine till winter then could not get car to start. Occasionally it would about the 30th time I cranked it. After fuel pumps, filters etc from dealer a young lady from a different shop told me to put some mid grade gas and sure as sh&t thst was it. The computer was not tuned for the winter chemical additive.
The Z states engine damage so I would do as someone else suggested empty your tank and put new 93 octane from a different station. If it fixes it, sure would save a lot of money. You can always change the pump if that does not work.
I only run shell super unleaded and have never had a problem with my 2013 or 2014 370Z NISMO's.
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