Anybody have any idea wtf this might be?
 

So I bought a 2010 370z nismo from a dealership (Not a Nissan dealership) Around 28 or 29 days ago. When I test drove it, it drove like a dream. Everything all perfect. So I am signing the paperwork and handing them tens of thousands of my hard earned dollars, and they bring me to my new car. It has just been filled with fuel.

A week later I get out and start it up. Immediately i know something isnt right. I wait for it to warm up every single time after starting it before driving off. The "Service engine soon" light is on and it idles at about 1100-1200 RPM. With aftermarket exhaust, this is extremely annoying. First thing I did was take it to auto zone, because that is .5 miles away and they have a scan tool. The guy told me misfire in cylinder #5.

I immediately take it to the dealership I bought it at because I paid for a warranty. After two or three hours of standing around they come out and ask me if I ever put "Bad gas" in it. I say no...i only put 92 octane in it. Which is what it takes. Premium. So they end up just clearing the code and its back to normal but i had to go pay for my own octane booster out of pocket.

Another week later after I get back from a short vacation at a lake, I get in it. Fire it up, and it's doing the **** again!!! I took it back to the dealership and was pissed this time. They ended up giving me a loaner car and held the car over night. They called me that night saying "when you bought the car we changed the oil, but apparently the car needs specific oil from nissan, and the cylinder misfire thing is from cold start". This car has never been started when it's cold. It's not even close to cold outside right now.

So I drove from portland, OR to Long Beach, WA. No problem, the very next day. It's doing this **** AGAIN. I'm taking it to the dealership tomorrow yet AGAIN. I don't know what to do anymore. The car is paid off, but it's jacked up and nobody can figure out why. So maybe this is a long shot, but here is a picture of how high it idles and the light, and if you read my story..give me your opinion please.

Btw I haven't been driving it hard at all. Just normal everyday operation.

http://i60.tinypic.com/28cg84l.jpg

Sorry about your trouble, especially so soon after buying your Z.

When the guy at AutoZone did a scan, did you get the actual code that he read? If so, what was it? Also, what was the code that the dealership got when they scanned your Z? I believe the code for a #5 cylinder misfire is P0305. Also, do you have any mods?

I'm sure others will chime in, but just wondering, specifically, what code (or codes) your getting.

In the meantime, here's a thread regarding a #5 cylinder misfiring - http://www.the370z.com/nissan-370z-g...al-purple.html.

I don't remember the code Auto zone had, but the dealership said they got like a P0300 which is a "random misfire" code. The only mechanical mod is Apexi exhaust.

Odd, since P0300 denotes random misfires for more than one cylinder. I believe that the last digit denotes a specific cylinder misfire, so P0305 would refer to a problem with the #5 cylinder. Maybe I'm just splitting hairs, but it's interesting that the guy at AutoZone mentioned the #5 cylinder specifically.

Anyway, if you want to check on your own, I would start by looking for vacuum leaks and, if you're so inclined, pull the plugs and check them for proper gap and/or to determine if they're fouled. Otherwise, let the dealer handle it under warranty.

Either way, good luck and let us know what you find out.

Could be a coil going bad, could be a bad batch of gas. I pulled the same code about a month ago after filling up at some no name gas station. A week later it went away on it's own.

I wish I could tinker with it myself, but I didn't spend all the money on the warranty for no reason. I only fill up at chevron. Everyone says i'm overreacting, but I spent a lot of money on this car lol it's the most money I have ever spent, and I figured idk..it wouldn't have problems already, let alone the same one 3 times in a row.

The Z does like the special ester oil they make but I've used it only one time. Every other time I've used castrol full synthetic and I've never had a misfire. So whoever told you it was because of the oil is a dumb ***

Agreed. Could be a bad spark plug, coil or bad gas. I'd also check the MAF sensor. But blaming the lack of ester oil is nonsense.

I agree the non use of ester oil has nothing to do with this.
As someone said your spark plugs might need to be checked or the connectors to the plug is loose.

I drive my car with that service light on. The car still runs great its just annoying to see that light on. But I got used to it.

I just needed to tune the car with all the breather mods I added

My z went in limp mode because of a broken maf bolt, the cars are really sensitive. It could be a spark plug going bad or a coil pack

Cant be the oil, becuse I use RedLine oil in my z... Never had an issue...

It could also be a bad o2 sensor. I get the P0300 code all the time since I removed my cats and the ECU is freaked out that the readings between the two sensors is not different and thinks it is a “rich” condition and throws the code. So you could get a new o2 sensor or get the free version of Torque and a BT ODBII reader and clear the code when it happens. Perhaps the installer of the exhaust damaged the o2 sensor.

If I was in this situation, I'd start by changing the spark plugs. After a few days if it comes back, try the coil pack. If the problem still persists, check the MAF and O2 sensors

A little bit of an update. Took it into the dealership today and they sent me to a Nissan dealership who will fix the problem whatever it may be on Wednesday. Will update again then.

How many miles on ~Z~ ?