Just to follow up, our Z had 5 out of 6 injectors leaking fuel into the combustion chamber, just as I had suspected. All 6 were replaced, and the car starts beautifully.

Did your Z have the symptoms like mine? Only rough starting in hot weather??

No. Mine didn't like to start after it sat 1-4 hours. Hot and Cold weather didn't have an effect. Residual rail pressure caused the injectors to dribble.

Mine only has the issue in hot weather as well hansoac, and only after sitting for about 2 hours after being run. After all this time, I have finally brought my car to the dealership yesterday for this problem. I'll let you know what they find. Did you ever bring yours in to the dealer?

Well in case anyone still follows this thread or has this issue in the future; I am happy to say my issue has been resolved! Gearhead51 hit the nail on the head. I had an injector leaking. The dealer replaced all 6 injectors and the rough start issue I have had for nearly 25,000 miles has been eliminated. Good luck to anyone else who has the issue. Maybe your nightmare can be shortened thanks to the info in this thread. :)

Here is my youtube video again showing what the issue looks like:

http://www.youtube.com/watch?v=TGpdqrRNR2s

I would also like to add that initially the dealer did not find that the injectors were leaking however Nissan had them run further tests on them individually and this is when the leak was discovered.

Peace

The hard part is getting them to do the testing on the injectors. They repeatedly told me that those injectors don't leak. I was asking them to check them for months. Granted, testing them takes a good bit of time, but once they tested them (pulled them out, laid them on paper towels, and pressurized the system) the fix was obvious.

I'm not a tech anymore, but after years of wrenching, I still know what to look for. Good luck dealing with this. My girlfriend worked at the Nissan dealer, and had a heck of a time getting this resolved... to the tune of a year and 12,000 miles. We were worried the car would get out of warranty with this issue.

So I am reading some say its a crank position sensor, some a engine temp sensor, and some saying it's a leak in the fuel injectors.

My 1 year old Altima with 48K on it, randomly it will start but not until after cranking for 2-3 seconds. It's rare that it happens (2 times in almost 4 months) . It could be first thing in the morning or later after I have been driving. Thoughts on what I should try first?

The theorys of crank position sensor and engine temp sensors were just that. Theorys. The fix for this issue has been found and it is leaky fuel injectors. Have the dealership test each injector individually for leaks. Keep in mind however that this is only if you are experiencing the exact issue as we have. There could be many reasons for your car not starting properly, but the particulars of this issue have been documented in this thread by me, zero610, bclarke, gearhead (who ultimately provided the fix) and a few others.

Check out my youtube video that I posted earlier in this thread for an example of the problem so that you can see if yours is similar. Good luck!

Here is my video of the issue and a description:

http://www.youtube.com/watch?v=TGpdqrRNR2s

Thank you for the clear reply. I will be taking my car to the dealer soon as I am getting close to 50K. The problem is just like you showed, it wants to start however just cranks for a few seconds. I might even be able to get a example of this problem to show as well.

Does anyone know why the injectors will start to leak? Aggressive driving?

No explanation other than being faulty. I didn't drive my car hard, and my problem actually started around 10,000 miles. I didn't find the fix untill 30,000 miles!

Mine is a bit different, and I've not had a chance to get a video of it. At first I thought it was a hot start, but it happens on cold start as well (early in the morning). It idles very rough and low, and it sometimes dies if I don't give it gas. Other times I leave it alone, and it slowly fires up and idles fine all in a matter of a few seconds. When the engine struggles to idle smoothly it sounds like an old V8 cranking.

I'm having the same issue with my new Z. She only has 3K miles on her. She starts up fine in the morning, but then when I leave the gym or work a few hours later, she doesn't want to start. Really embarrassing with a brand new car. :shakes head: Is it really possible for a new car to have a leaking fuel injector?

Is this problem you're having?
http://www.the370z.com/engine-drivet...-starting.html

I posted in that thread as well, but everyone else is suggesting the cats failed. Test pipes on the way in a few weeks. Hopefully that will resolve several issues.

Rusty, YES. Mine did this from the start... although I didn't notice it much in the cold months when I bought the car. It showed up more in the hot months later on. Your description sounds exactly like the issue I had. Bring it in, show them this post, and possibly my video and have them check the injectors. I and many others suffered from this for months, with some giving up on the fix. It has been confirmed now that replacing the injectors is the fix. If the dealer gives you any trouble send me a PM and I'll give you the name of my dealer/service manager in case they want to talk to each other about it. Good luck.

Thanks for the reply. I'm gonna schedule an appointment sometime this week. I'll post an update after that. I hope this fixes it.

How'd things go Rusty?

I'm sitting in the dealership right now......waiting...... Hopefully this issue gets fixed today. I'll give an update later today.

Let me know how it goes. The test pipes didn't help. Still had issues getting it to idle after a start. I just give it gas while it struggles to idle to help it. I probably need a new tune.

Sorry its been awhile since I've been up here. Went out of country on vacation and now I'm trying to get the car finally fixed. They couldn't find anything on that last post and I had somewhere to go, so I just left. The car has been in the shop this week though and the update is.......this will probably be the last Nissan vehicle I buy. I love my car, but they are trying to pend it on my aftermarket radio. I've got to completely pull it out of the car before they go any further in diagnosing her. This dealership is over an hour away, so going back in forth is crazy. Not sure how a radio install in a base model could cause this issue. I'll keep you guys updated.

Hi Rusty,

I wouldn't blame the Stealership service dept. stupidity on Nissan.
That's the most ridiculous thing I've ever heard, the stereo causing the engine to malfunction. Good luck with that one. But, I guess you ought to go ahead and put the radio back in, it's your word against theirs, the time you spend fighting with them over the radio not causing the issue you could be getting the real problem fixed.

Yay!!! Another hater!

I guess they think your stereo is using too much juice? Lol

Well I put my base stereo system back in the car, only to have the same problem happen. Looks like she will be at the dealership for a while, starting Tuesday. Wonder what they'll say now........guess the aftermarket tint is causing it!:confused:

I have repaired the youtube link for anyone needing it.

370z hard start after sitting - YouTube

Replace all 6 fuel injectors to fix this issue!!

Thanks for doing that bro! That is the same, exact thing my car does after being warmed up. Getting reafy to take to the dealership now. I'm gonna show them your video. I contacted Nissan about my issue too and have someone following up with the dealership/me. Again thanks a lot for retrieving the video! I'll keep everyone updated.

So I passed on the video and dealer info that you sent to me and no updates as of right now! ......so still waiting! Pretty awesome, got a 13 model Z with 4600 miles on it and no one has a clue what is wrong.:shakes head: Hoping they check out those fuel injectors...:ugh2:

Good luck buddy

Thanks bro! She is still at the dealership. I passed along all the info you sent to me. They aren't using any of it though. Keep doing what Nissan advises them to check. They think its electrical, and I think that its the same issue you were having. Oh well, I'll just continue to drive this loaner Rogue like I stole it.(which is another joke in itself) I'll keep everyone updated.

Update for the time being is.......they are gonna change out my fuel pump and see how that goes. I hope something works! I want my Z back! "I wanna go fast!" - Ricky Bobby

So after being in the shop for 3 weeks, I got her back today! They changed the fuel pump on Monday, which didn't work. Then overnighted the fuel injectors and swapped them out this morning. The Z is running perfectly now..... problem solved! Thanks again, to djpheer!:tiphat::driving:

Welcome back !

Sent from my SAMSUNG-SGH-I717 using Tapatalk 2

Awesome, really glad to hear this!!! :tup:

Hi all,

Having the same problems as many of you here. Anybody have any information regarding a service dept in SoCal that knows about this issue, called a couple and they said they would have to keep the car, wire it up to the computers and try to replicate the problem before they proceed.

Is it plausible to ask them to just check the fuel injectors and also is that inspection and replacement covered under the factory 50,000 mile warranty?

Thanks in advanced

I believe this would fall under the 50K warranty. My dealership didn't even test the injectors. They checked the fuel system and replaced the fuel pump. After having my car for almost a month, I said lemon law, and they finally replaced the injectors. They replaced all of them, because they told me that they couldn't test each one in their shop. The issue would only happen to my Z after she set for a few hours. If your issue looks like djpheer's video, I can guarantee that its the injectors. It was spot on with my issue. Good luck to you! I hope that you get your girl fixed soon.

I went into my dealer's service department and told them about my problem. He was pretty understanding and said he would test the fuel pressure system. Said if that was the problem it would be replaced under warranty so might as well check it anyways. He had the car for about 1.5 hours, said they can a test of the pressure of the entire fuel system and there was nothing wrong. They measured the pressure over 30 minutes with no problems.

I was not able to replicate the problem at the dealership so I understood they couldn't do anything about that. They would have to attempt to replicate it and go from there. Problem is, about 3 days later I would have trouble starting the engine again. It would crank, struggle, and just die. It would only start after 3 attempts to start the car.

I don't know what I should do at this point, I'm at 44,000 miles and 2 months away from my 3 year warranty being up. I'd love to get it fixed, the car runs beautifully otherwise. I'd just hate to encounter a problem down the line after the warranty has expired.

I am curious....are the cars being parked overnight on slants or other elevations besides level?

Nope, the cars parked in my driveway. Which is pretty leveled, no significant slant or anything.

I welcome myself to this club. experienced this problem today. car hesitated to start after sitting an for an hr. I got nervous so I shut it off and restarted and got similar issue. There no heavy cranking noise but it just starts up then idles back down then the engine cuts off. From what I am reading it seems like injectors. Could it be a combination of plugs as well?

Same thing
 

^ happens to me too. I have a 2014. Let me know if you resolve the problem. I am from MA too.

Thanks!

I have encountered this issue a little here and there (I'm at 93k miles). My solution was to give the car just a little gas during start up and it would always start up this way. Is this problematic? Am I doing damage to the car by doing this?