So 4 days go by with the new battery. I get out in my car this evening around 4pm. It's about 75 outside. The dealership keeps telling me its throwing this P0300(Random misfire) code because of cold start conditions. It hasn't been cold in the entire month i've owned it. It's doing it again. So we've been through: fuel, oil, battery. I told them countless times to replace the coil, or the plugs or something. This is not normal...right? This can't be happening every week on a random day I drive my car. Otherwise, who would buy a car that always has the service engine soon light on every week? Nissan Dealership can't even look at it until Friday.

I would start telling them if it doesn't get fixed soon it's going back for a full refund.

IDK if this applies to manual car's;but i've seen that a cracked flywheel will cause it on an automatic.

I just googled this code for this car and about 5 threads from this forum were among the first on the list. Let's see a show of hands how many of us paid for a car to have to clear a code every week? I know I sure as **** didn't. I guess I'll just keep going to the dealership and have them put a brand new part on for free every week until it's fixed. It's going in tomorrow morning. Can't wait to hear what their solution is this time. By the way, I have told them what to do, but they don't listen to me. At this rate I'll have a brand new top end. It's a shame that I have owned the car a little over a month and have only enjoyed it for about a week. The rest of the time its been in the service department at two different dealerships while I drive crappy loaner cars around.

Here's a little update. Car has been in the service dept of the dealership for 7 days now. This morning the service manager calls me and tells me they need to do a compression test, but they don't have the necessary tools until Tuesday. I drove over there and said I will go get a compression test kit RIGHT NOW. The service manager told me: "No, it's back there all taken apart right now" So I was like...oooookkkaaayyyy....I will go get the compression test kit right now to expedite this situation, and he seemed like he got mad at me and said "No." Then I said WTF and left. They are dragging their feet. First they said they were going to replace an injector, and now its a compression test. By the way, in the beginning of this thread I mentioned it being a "Cylinder #5 misfire" and the dealership JUST NOW. Figured out that hey, it's cylinder #5 that's the issue!

They assing around & probably don't have a certified tech that knows how to work on one.
You're getting jacked around/ may want to seek a refund or comparable Z, upgrade of course... Hopefully nobody sprayed that one & got a cylinder- could have melted down an electrode.


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Sprayed? With Nitrous? Not to my knowledge. The Nissan dealership just called and said that every cylinder passed the compression test, and that "Nissan" told them to check for a blown head gasket...? -_- 12 days they have had my car now.

well i hope it gets worked out, i been dealing with a p0300 myself. But the last time the code popped up i got the p0306. So thats a relief that its isolating the problem now, and i can start to check around cylinder 6. Will be inspecting my spark plugs, coils, and injectors, and o2 sensors now. Will also be checking for any type of vacum leaks.

my 350Z was plagued with this after awhile. Turned out to be a bad coil pack. Had the same issue with my 370Z after doing headers (plugs and coil packs were new). Had the code shut off via uprev. Got a nismo 370Z recently and it does it when its cold due to the test pipes. I remove it and go about my day. You will find hundreds of people with the same problem. The ecu and the electric components are very sensitive on these cars for some reason. I simply got myself and ELM327 Bluetooth dongle and the dash command app. I know there is nothing wrong with the car and just remove it when it appears.

Odds are the dealership isn't going to find anything wrong. They are worthless and rely on computers to tell them what the issue is. They go through their steps to "fix" the issue and most of the time they never accomplish it.

This is a common "issue". An issue that doesn't matter, but I understand your frustration since you've spent your hard earned money on it and have paid for an extended warranty.

Man hope It get fix soon the right way.

Anybody have any idea wtf this might be?
 

I tried telling the OP but he doesn't want to listen. It's a non issue and now they're taking apart his engine and ******* around. Might want to use Google search next time and save yourself the hassle...

Oh you drive a nissan Z car with a VQ? Get yourself a code reader and stand by to clear lol.

Anyone that tells you they haven't had some BS SEL light pop up is lying. Clear it and drive. Want peace of mind? New plugs, new mafs, new coil packs, new cats, and new O2 sensors. Then when the code comes back and you get the usual, you'll know it's all BS.

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Never through a code here. Neither have many of the Z's in my area. The few that have popped up were because of test pipes w/o a tune. Can't really say the 4-5 Z's I know are plagued with throwing codes.

Miss fire on #5 either bad coil pack, bad spark plug, or bad valve.

The first time they would've told me that an oil change caused a cylinder misfire I would've said "keys please"!!! These noobs obviously no jack Shiit about cars, it said cylinder 5 misfire........... Okaaaaaaaaay, then check cylinder 5 buttwash, SMFH!!!