Sounds like a coil pack going bad. That is what they do when they start to go. Misfire when cold, then clear up. Next thing, they will completely go dead and miss all the time.

How does a coil pack looks like and where is it located?
is that something easy to DIY?
How many miles do you need to change plugs in our Z?

Even though some manuals say 100k , I've seen others say 60k hard driving; I'm about to do mine soon/ got 61k on a 11',,, but still getting 27mpg avg.


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do you have aftermarket intakes? If so get the Z1 motorsports silicone hoses for aftermarket intakes.
I had the same code and I replaced those hoses and changed my spark plugs and it's been good for 6 months now.

They sit right on top of the spark plugs through the valve cover. You have to take them out to change the plugs. Must pull the intake first though.

If anyone put bad gas in it would probably be the dealer.

When I bought my Nismo 350Z the car was on empty so the salesman told me to hop on in and drive him over to the gas station and he would fill up the car for me.

We get to the gas station and he clicks on 87 without hesitation and I had to jump out of the car and tell him the car only takes premium. He was like "Oh ok"

and then we had to go in, get the pump reset and refill with premium.


While I'm on this rant, before I bought my Nismo 370Z I told the dealer multiple times about the shipping spacers and asked again for confirmation they got the ones in the top that were hard to see. Dealer said I am 100% confident we got them all. So stupid me didn't want to look like a pain in the *** at the dealership and jump under the car to check and take their word. I had asked them about 3 times at this point.

I get off the highway and was shocked how much stiffer the ride was than my 350Z and sure enough the 2 top shipping springs were in there still.

I would take the car back and get a refund if possible. This may be the first sign of trouble among many IMO

Just rolled over to 43k

Heck, I got 49K and change. I bought it with 19K a little over a year ago.

So here's an update. The Nissan dealership told me the battery is bad. Even though it always reads 14V on the gauge in the dash, oh and thats causing misfires...This is nowhere in my diagnostic flow chart lol. I've never heard of a bad battery reading 14v, and causing a misfire in the engine. Maybe a bad coil pack, or plugs, but never a battery. Also love how its not covered in an extended warranty.

^Is it possible the previous owner tuned it in any way which is causing the problems.

I've heard of some shops around here doing an "uprev" tune to the Z's and can screw it up.

Also, are there any signs of modification done previously?

Not to add to your paranioa but someone could be that someone screwed with the car, started having problems, got it fixed enough to trade it in. Do you /the the dealership have the service records on the car. If the basic maintenance wasn't done at Nissan, it could have been done by the previous owner or a tuning shop.

I used to bring my Evo to my tuning shop for oil changes instead of Mitsubishi.

Hope everything works out. Do they have lemon laws on used cars where you are from?

The only mod I see is Apexi exhaust. A guy responded to one of my posts on here saying "You bought my old Z congrats!" And his profile picture looked like my car on the dyno at COBB surgeline. I think that was just a dyno run though, not tuning. His sig says it was dyno'd bone stock. But who knows. As far as maintenance, there were a decent amount of records on the Carfax if that means anything.

The dealership gave me a loaner...a freaking Juke. Ugh...lol

Check if the cars been tuned if so make sure its to stock

Only way a battery would cause an issue is if it has a dead cell. That will wreck havoc on the computer systems. Strange things tend to happen when this actually occurs.

This shop clearly does not know what they are doing. UPREV is 100% safe as long as you get it done by someone reputable.

That goes for UPREV or any other tuning, ECUTEK etc…

Well, if they say it's "fixed" now with a new battery, see if it happens again, if so, i'd be looking to get a full refund.