Rough Start - Something Seems Wrong

ALX370Z

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

RustyM2001

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.

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ALX370Z

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.

Plasmite

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

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ALX370Z

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

Gspinin

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?

K3shuyun

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

Thanks!

plato

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?

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DIGItonium

I'm starting to wonder if my stock FPR is starting to fail. Lately I'm starting to smell some fuel when I give it at least half throttle, and under 3k RPM I'm smelling some fuel through the vents. Throttle response is getting worse especially under 4k. It just ramps up slower than usual, and is a bit rough or wants to stall. The engine has died on me a couple of times after coming to a complete stop. Idle would drop pretty low and stall. Rough starts is occasional, so I wonder if low fuel pressure is the culprit.

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RBfastback

having that same problem just now as I sti in my car.
drove home fine, jacked one side of the car up to check if I hade the old style brake lines w/ the 90 deg bend or the newer( I have the older) and let the car down and now it won't start...
last week nissan replaced my MAF's after fighting with them to do it under warrente for 30min then the finally agreed to do it. my cars a 2013 nismo with 25k on it and the oil level is fine. WTF

DIGItonium

I just got done changing out the spark plugs (fouled after 45k miles), cleaned the intake plenum, throttle bodies, etc. I don't have anymore issues starting the car (so far), and it seems to run pretty nicely. I just need to figure out if and where the vacuum leaks are since the idle is bouncing a bit.

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RBfastback

it may be something else for me, still hasn't started. just starts then stalls even when engines cold.
sel is on, and giving it gas when starting it dose nothing.
just got towed to nissan since I'm still in warrantee

Jordo!

You might need to go though an idle learn procedure -- otherwise, spray carb cleaner around the IM and see if the idle revs up.


I'm guessing either bad cam or crank position sensor, or a VVEL issue.

Although it could be something more prosaic like bad MAF's or O2's. Another possibility is plugged cats, if you have them.

EDIT: Wait it was fine until you had it on a lift and just checked the brake lines??? You might have a damaged wire or connector to a primary O2 sensor. Otherwise, no idea. Why did you have them replace the MAF's before?

Good luck!

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DIGItonium

I did the following: throttle closed, accelerator pedal, and idle volume learn (twice). The next morning I redid the zip ties and switched out a hose that wasn't fitting the barb properly. It idled and warmed up nicely, which it didn't do that the day before. After a test drive idle bounces ever so slightly at times. This is something I dealt with before doing the major work, but I will continue to monitor and trace any leaks. At least it's not throwing P0507.

So far so good... engine is running smooth, and so far no warm start issues.

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Jordo!

When you say code for MAF, do you mean out of range or high fuel trims? You might just need a tune.

If it dials itself out, it could be lingering fuel trim that will eventually self correct (although I think you can clear those out with cipher). If intermittent, I'd try cleaning MAF sensors with that CRC spray.

If still no change, then there may be a small deformation or pinhole somewhere causing an occasional vac leak.

I actually had that problem on the OEM intakes! I over-tightened a hose clamp and managed to ever so lightly deform the plastic of the intake tube

If you still have any of those little L shaped resonator boxes in the intake to IM tract, I'd check those too.

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