Whine/Noise/High Pitch Arg!

ValidusVentus

Thanks man, same to yah. Funny that you got that app too, its pretty cool tho. If you get any resolution on this issue let us know.

maniacdave

Got the resolution today, actually. They said they've been searching for it a long time and now think it's the fuel pump. They compared my car and noises to a new Z and agreed that this noise shouldn't be there, so they've ordered a new fuel pump under warranty.

I'm praying that's what it was and that I'll be able to enjoy driving the car again!

Did anyone else here had the whine traced down to the fuel pump?

shadowdrgn0

some capacitors make a high pitched whine when they are energizing. a capacitor would also explain why the whine persisted after the car had been turned off. would also explain why the ability to hear it in a certain range of reving the engine as the alternator was spinning up and increasing output. just a theory. mabey somebody can take it somewhere...

i really dont know anything about the car, but i have a little electrical knowledge.

Csquared

First they said it was my speakers, so they disconnected them. Then they said it was my fuel pump, so they replaced it. Finally they listened to me and changed my ECU. All was well.

maniacdave

That's what I'm afraid of, that they'll change the pump, but the noise will remain. Hopefully, they're really trying to find the issue and really pinned it down, not just to shut me up. I have no idea how much more the ECU costs compared to the fuel pump.

Anyway, if it's still present after the exchange, I can go from there. Replacing the pump means they acknowledge the problem, so if it doesn't help, they'll have to look elsewhere.

Dammit, I should've waited for 6 more months and buy the 2010 model...

Pelican170

Just heard this noise for the first time last week. To me, it sounds like its coming from under the car, so fuel pump would make sense...

maniacdave

Well, I'm back from a holiday trip and I'll be picking my car up tomorrow. They've replaced the pump and now they're saying they can't hear any noises. I'm still a bit worried, because they've been handling the issue as if I was the only one who could hear it. The rep person confirmed it too initially, but later it was obvious that he's regretting acknowledging it.

Now he just says the tech people who couldn't hear it from the get go, can't hear it any longer and that it must have been the pump. Not very encouraging.

I'll let you know tomorrow how it goes!

maniacdave

Hi. As expected, the fuel pump replacement didn't help a bit. The noise is still there.

I didn't even take the car with me. I left it there for another try. This time, the original rep who could hear the noise wasn't available, so I made the check-in with another guy. He said he couldn't hear anything even the first time they've tried it so he cannot confirm it. So I asked him to try again, and again, he couldn't hear it, so I asked if a woman from their office could give it a try. She couldn't hear it either, but when I said it's like a ringing in your ear, she finally recognized it and confirmed that it's very unpleasant. After that, even the guy could hear it! I guess they were looking for some other kind of sound.

Nevertheless, now everybody from Nissan reps can hear the noise! I have really sensitive ears, but now that basically anybody can hear this sound, it shows how bad it is. I took my audio spectrum analyzer again and pointed out the sound is coming from under the glove box and the rep made note of everything. I even mentioned the other people on the web complaining about this and how ECU replacement fixed their issue.

I can't believe Nissan is doing NOTHING about this!

Now we wait. I really don't care if the car is stuck there for the next 14 days, because I can't drive it anyway. I won't. Getting a headache from driving a car for an hour is not normal!

Fingers crossed this will be the last attempt. Wish me luck!

cubarican84

Nissan will do something about this. The problem is the transistors in the ECU if I remember correctly and only affects 2009 models. Take it to the dealership and get your ECU replaced

Sent from my ADR6400L

Pelican170

I have the noise which im pretty sure is the same as what you guys are talking about... 2010.

Vaughanabe13

Is the noise always persistent or does it only happen intermittently? I'm just wondering because one night I started up the car and heard a high pitched noise (in the 09) but it was pretty faint and easily covered up by the stereo at low volume. After that night I haven't heard it since. Is it something that gets worse over time?

I'm an electrical engineer so I could probably take out the ECU and look for the bad caps or transistors that are causing the squeal, but I don't know if I want to go to that much effort if I can get it replaced under warranty...

__________________
2009 Nissan 370Z Touring, w/sport, 6MT, chicane yellow/black.

maniacdave

From my experience, the dealership will try to replace anything *but* the ECU, if they acknowledge the issue at all.

It's a bad combo: many people can't hear the sound (depending on how bad it is) + the ECU is rather expensive + Nissan doesn't have any official advisory about this + dealerships don't like to replace expensive parts just because of "some" noise.

In total, my car spent 3 weeks in the dealership so far and counting.

PS: Yes, the squeal is exactly the sound caps/transistors sometimes make. Audible spectrum FFT analysis shows one single freq @ ~9kHz. The noise starts/stops with engine on/off, simple as that. Sometimes the engine needs to get warm a bit before it starts (~10mins running). Idling/gunned not much difference.

cheshirecat

I have the issue and haven't gotten it fixed yet. '09. It happens on startup whenever you apply throttle. You can tap the throttle and get the whine. Eventually when the car warms up it's always there.

Annoying as hell. Hoping they come out with a TSB or something before my full warranty runs out. Really don't want to do the whole song and dance with the dealership to get it fixed.

franky2222

did u guys even read the G37 THREAD posted in this thread????ITS THE ECU ok everyone
i have this noise too but i really have to listen for it,,,some REALLY cant hear it its a high pitched frequency THANKS

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08 G37s 6MT//UPREV//INJEN CAI//BERK HFC//20%//BATOVERLAYS//EIBACH//GTSPEC/

maniacdave

We know it's the ECU. It's the dealerships that don't want to know!