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Low rpm vibration noise?

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#21 · (Edited)
My understanding is the the torque converter lockup is mainly for better gas mileage (less slippage), and the unlock allows enough slippage so that you can come to a stop (like pressing on the clutch pedal on a manual transmission.) It doesn't need to unlock for a CVT to change gear ratios due to its inherent design. Perhaps it would need to unlock for conventional automatic transmission gear changes?

If what you say were true, it would have to remain unlocked all the time due to the CVT continuously changing gear ratios...

I monitor the torque converter lockup/unlock via the CVTz50 app, and it supports my understanding.
 
#22 ·
I should also mention that the 1000 RPM vibration will occur continuously as long as I'm not acceleration or starting to climb a hill, at which point the RPMs increase a few hundred due to the increased load, and the vibration stops. My 2003 would only drop to around 1200 under the same circumstance if I remember correctly...

The 1000 RPM mode is just to achieve the best possible gas mileage possible when cruising at a constant speed on a level road IMO. And in my case (and very few others it seems...) it's not being damped properly.
 
#23 ·
MuranoSL2003 said:
My understanding is the the torque converter lockup is mainly for better gas mileage (less slippage), and the unlock allows enough slippage so that you can come to a stop (like pressing on the clutch pedal on a manual transmission.) It doesn't need to unlock for a CVT to change gear ratios due to its inherent design. Perhaps it would need to unlock for conventional automatic transmission gear changes?

If what you say were true, it would have to remain unlocked all the time due to the CVT continuously changing gear ratios...

I monitor the torque converter lockup/unlock via the CVTz50 app, and it supports my understanding.
Click to expand...
That actually makes a lot of sense. Thanks for adding some good info!
 
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#24 · (Edited)
This Car&Driver article mentions the 1000 RPM exhaust booming that I experience. It's the only article that I can find that mention of it... And only one of their drivers. It seems most people are not sensitive to this low frequency sound, which is probably why the problem has never been addressed since it first appeared in the 2015 Murano...

www.caranddriver.com

2015 Nissan Murano AWD Long-Term Test!

Find out how the Nissan Murano satisfied (and disappointed) over our 40,000-mile long-term test.
www.caranddriver.com www.caranddriver.com

50798


It's a shame that Nissan doesn't offer a CVT programming change to address this problem for customers that are particularly annoyed by it. I'd be more than willing to sacrifice a bit of gas mileage, I don't think the impact would be noticeable... It's not so much a noise, but a VERY low frequency booming sound that is felt by my eardrums more than heard. My Murano is otherwise nice and quiet inside, which makes the booming that much more noticeable and annoying...
 
#25 ·
MuranoSL2003 said:
This Car&Driver article mentions the 1000 RPM exhaust booming that I experience. It's the only article that I can find that mention of it... And only one of their drivers. It seems most people are not sensitive to this low frequency sound, which is probably why the problem has never been addressed since it first appeared in the 2015 Murano...

www.caranddriver.com

2015 Nissan Murano AWD Long-Term Test!

Find out how the Nissan Murano satisfied (and disappointed) over our 40,000-mile long-term test.
www.caranddriver.com www.caranddriver.com

View attachment 50798

It's a shame that Nissan doesn't offer a CVT programming change to address this problem for customers that are particularly annoyed by it. I'd be more than willing to sacrifice a bit of gas mileage, I don't think the impact would be noticeable... It's not so much a noise, but a VERY low frequency booming sound that is felt by my eardrums more than heard. My Murano is otherwise nice and quiet inside, which makes the booming that much more noticeable and annoying...
Click to expand...

The impact to MPG may be more noticeable than you think. Compared to the 2nd generation, which had no such set up, the 3rd gets significantly better MPG. Also, I've found that by driving purposely in that range on shorter trips it does increase my MPG a lot. Mine doesn't reverberate intolerably, if at all between 30-40, it's more noticeable for me around 25-30. (lots of 30mph roads). If I tick it up just a tad the reverberation goes away.
 
#26 ·
brand new to Murano (bought a 16 SV few days ago) and new to the forum. I noticed this too and the car I traded in for it (2009 Dodge Journey with AWD) did the same as the Murano with that noise. It's nothing new to me but it's seems to not just be a Nissan thing. I think more and more brands have this same issue. Either way really enjoying the Murano despite the small noise at 1000 rpm.
 
#27 ·
Yeah I agree. Had a Durango RT rental and it also made this booming sound at low RPM. It's just that the throttle on that car was much more responsive so I was able to get rid of it by just oh so slightly pressing down a little bit on the gas.
 
#28 ·
DStewart said:
brand new to Murano (bought a 16 SV few days ago) and new to the forum. I noticed this too and the car I traded in for it (2009 Dodge Journey with AWD) did the same as the Murano with that noise. It's nothing new to me but it's seems to not just be a Nissan thing. I think more and more brands have this same issue. Either way really enjoying the Murano despite the small noise at 1000 rpm.
Click to expand...
Its akin to a regular automatic transmission seeking and staying at a lower gear for few economy, so I'm not surprised you've felt it in other vehicles.
 
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#30 ·
ElvisStafford said:
My Jeep with the 5.7L V8 runs at about 1200-1500 RPM at 75 MPH, which seems awfully low. Of course, they do it for gas mileage, and that V8 has great grunt at low RPM as it's designed to.
Click to expand...

It's definitely for gas mileage. In fact, if you try and purposely run it in that range for a trip, (as best as you can considering conditions) especially a short local trip, the mileage difference is significant. Most cars will get you to the highest most fuel efficient gear as fast as they can, with a similar feeling/vibration. I don't find it particularly annoying and if I do a slight increase in throttle will eliminate it. Next time I'm at the dealer I'm going to ask about it.
 
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#31 ·
I've asked the dealer about it. They said it's normal operation and the way Nissan programmed tht system for fuel efficiency. Nothing my dealer could do about it.

Not sure if bumping up idle RPM by 100 would also in turn bump up the cruising RPM by 100.... forgot to ask them that.
 
#32 ·
vortex said:
I've asked the dealer about it. They said it's normal operation and the way Nissan programmed tht system for fuel efficiency. Nothing my dealer could do about it.

Not sure if bumping up idle RPM by 100 would also in turn bump up the cruising RPM by 100.... forgot to ask them that.
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Thats what I figured. Thanks
 
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#33 ·
MuranoSL2003 said:
I should also mention that one of the things I wonder about is the electronically controlled engine mount. It comes into play @ 900 RPMs. It's softens below 900 RPMs to alleviate vibration at idle, then hardens above 900 RPMs to avoid vibration at driving speeds. 900 RPMs is very close the the 1000 RPMs that vibration occurs... There's an OBD2 PID for it, but I haven't been able to successfully monitor it yet...
Click to expand...
Were you ever able to address this issue? Looks like I'm having the same one
 
#34 ·
I still have the issue... Over time it seems to be diminishing to some extent, or I'm just becoming less sensitive to it. It's still annoying... Maybe more miles will resolve it somehow, I still have less than 3k miles on mine...

Can you explain what you're experiencing? Maybe you can articulate it better than myself...

I have searched extensively all over the Web in the past to find others mentioning a similar issue. But there never seems to be a resolution update for the few threads I have seen...
 
#35 ·
MuranoSL2003 said:
I still have the issue... Over time it seems to be diminishing to some extent, or I'm just becoming less sensitive to it. It's still annoying... Maybe more miles will resolve it somehow, I still have less than 3k miles on mine...

Can you explain what you're experiencing? Maybe you can articulate it better than myself...

I have searched extensively all over the Web in the past to find others mentioning a similar issue. But there never seems to be a resolution update for the few threads I have seen...
Click to expand...
Well, I can try.
So, my new to me 2015 Murano was making a noise/vibrating when going over 25mi(40km)/h

Took my car to the mechanic, had the driver wheel bearing replaced and that noise is gone. However, I have this new vibration/gridding noise now at low rpm.

My mechanic thought it'd be the heat shield, but he just called me to say that the heat shield is tight and locked in place so he doesn't know where the noise/vibration is coming from.

It happens at low rpm only, or when I'm over 65mi (105km) / h

So I found this thread... which sounds just like what I have...

The car also makes a noise/vibrates when accelerating from 0

It's annoying. My 250000km (155000mi) Kia Sorento doesn't sound like that. I'm starting to regret my purchase despite all the comfort and luxury the Murano has to offer
 
#36 ·
Your issue sounds different from mine... Mine is more of a low frequency harmonic that only occurs up to speeds of ~43 MPH when the RPM drops to 1000-1100 RPMS and is under a light to moderate load. If the load is higher the RPMs will rise above 1000 and the harmonic goes away. I feel it mostly in my eardrums, but more as a pressure wave than a noise... I think I may be somewhat more sensitive to low frequency sounds/harmonics than others...

Has your mechanic checked the rotor dust shield? It can get bent during the wheel bearing replacement. There's very little clearance between it and the rotor...
 
#38 ·
MuranoSL2003 said:
Your issue sounds different from mine... Mine is more of a low frequency harmonic that only occurs up to speeds of ~43 MPH when the RPM drops to 1000-1100 RPMS and is under a light to moderate load. If the load is higher the RPMs will rise above 1000 and the harmonic goes away. I feel it mostly in my eardrums, but more as a pressure wave than a noise... I think I may be somewhat more sensitive to low frequency sounds/harmonics than others...

Has your mechanic checked the rotor dust shield? It can get bent during the wheel bearing replacement. There's very little clearance between it and the rotor...
Click to expand...
It is definitely not the rotor dust shield...
It sounds a lot like what everyone has described on this thread, you included. Still waiting on the mechanic to call me back but mostly likely I'll just have to deal with it.

There's is no metal grinding sound. It's more likely a vibration that appears with low rpm or high speeds...
 
#39 ·
You mentioned your noise occurs above 65 MPH. That's nothing like the noise I have... My noise ONLY occurs while moving at ~15-20 MPH up to around 43 MPH, and only when the RPMs are at 1000-1100 RPMs. At 65 MPH I'm over that 1000 RPM threshold. Anytime the RPMs are over 1000-1100 my noise is completely gone.

Did your noise start right after the wheel bearing replacement?
 
#40 ·
MuranoSL2003 said:
You mentioned your noise occurs above 65 MPH. That's nothing like the noise I have... My noise ONLY occurs while moving at ~15-20 MPH up to around 43 MPH, and only when the RPMs are at 1000-1100 RPMs. At 65 MPH I'm over that 1000 RPM threshold. Anytime the RPMs are over 1000-1100 my noise is completely gone.

Did your noise start right after the wheel bearing replacement?
Click to expand...
I can't really tell if it was there before or after as when I got the car I already had the wheel bearing issue.

Just got the car back and my mechanic asked to bring it back this Friday.

He said that once the car is on the lift, there is no noise at all. However, he hasn't had time to look into it deeper.

I drove to the gym and noticed that when my rpm drops to 900-1000, it then vibrates and generates a little noise (might be due to the vibration itself). Then, I shifted to manual mode and keeping the rpm up did the trick. However, I drive 90% city so driving manual isn't an option. If I wanted to drive manual, I'd have gotten myself a stick car (which I really enjoyed back on my track days).

Anyway, it's so annoying. I had really high expectations towards this Murano. It's my third car equipped with a Nissan's CVT and the first with a problem like this...
 
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