Error code P300 Random Misfires - 2010 370Z

IBJAMMN

I get Service Engine Soon light - I have had this cleared several times - indicates Random Misfire.

I have original Plugs on my 2010 370z, only have 16,000 miles.

Should I replace with New OEM or should I replace with Hotter Plugs.

Has anyone had this issue and What resolved it.
I have spent some money and time trying to figure this out - Only answer is Random Misfire.

JARblue

Unfortunately, that code is a catch-all code for a lot of different issues. You'll need to do some research to see what kinds of symptoms you have that might identify the cause.

The people who have resolved have done so via numerous different repairs. So no telling what specific repair your car will need without more troubleshooting. It is typically a huge PITA.

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bcrider

With only 1500 mile a year on average, how old is the fuel in the tank? If its been in there a while you may try some fresh 93 octane. Just a thought and won't break the bank.

SouthArk370Z

As per JARblue, that code can be caused by many things. Some of the easier/cheaper things to check are:

Sparkplug condition. Pull each plug and inspect. Many pages on The Intertubes with descriptions and pics. You can make a decision about plug heat range after the inspection.

Clean the MAFs. Very easy job and something that probably needs to be done anyway. Several DIY threads on this site.

As per bcrider, make sure you have good gas in the tank.

Check for any other DTCs that may have been thrown. You can find OBD code scanners/readers as cheap as $20.

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IBJAMMN

Thanks to all that replied - I actually put 10,000 miles on the car now. 17,000 miles - I purchased the car with 7,000 mile on it Nov. '19.

I drive it like its meant to be driven - This only recently started over the past few months - I will clear it - then a week or two later its back.

I plan on replacing the plugs with new OEM to see if that helps.

Thanks again.

SonicVQ

I wouldn't order the plugs just yet. The factory plugs are good for 110,000 miles, without a time limit.

However, I would remove the plugs to check for oil on them. (leaking valve cover gasket) Also, have a look at the tips/gap/colour and inspect the ignition coil rubber boots for cracks/rips or white arcing powder/dots.

HttpRyxn

So When I first got my 09 Z, I stumbled upon this problem 1 week into owning this car with 49K miles.

Let me be the first to tell you that The wide variety of things It could be Would be
Spark Plugs: Coils: Dirty MAFS: Debrief In fuel rail: Injectors need replacement
In My case since No one on this forum had responded to my P0300 code question I feel like I should at least try to give my 2 sense on what helped me.
First my mechanic replaced all 6 plugs, ESS light came back on after 40 miles, After that we cleaned the MAFS Sensor and Coils, Still the code came back after another 40 miles, At this point I took It In to nissan and they said there was debrief In my fuel rails, and they cleaned it out and assured me the code would not come back on, keep In mind Nissan had my car for 3 weeks because they've never seen this happen. But to no surprise after 15 miles the code comes back on and by this point I'm furious The car I just bought has spent more time In the shop than me driving It. I take It back to my Honda dealership Tech (I work At Honda). I looked all around forums to see If anyone else had this problem and only one other person did, they said that excessive vibration from the flywheel could cause misfires, which sounds crazy (I'm also not a mechanic sooo ), But I told my tech and he said lets just get a new OEM flywheel and clutch to see If that fixes the problem. fast forward 3 weeks of my car sitting at my dealership because I'd prefer not to drive with an engine light on, The only brand new OEM Flywheel from Nissan was In Florida And I snagged It For like So much more than I should have around $1,800. so my tech replaces not only the flywheel & clutch but the Clutch Slave Cyl since I heard those go out often in these cars, I just wanted to be safe, my tech also replaced the CKP sensor. So after all this money and time the flywheel, Clutch,CSC,Ckp Sensor I haven't had a code pop back up in about 2 months, But I do baby the hell out of my car and Am kind of scared to drive above 4K Rpm because I think it'll through another code and break If I try to enjoy my car. Anyways I would say try the CKP Sensor and maybe that will fix the code If you have tried the other things already. Also I am a newbie to owning this car and I am not a mechanic so I am still learning everything.