[Murano SL 23]

Just got a 2023 Murano SL and each time I start the engine, without my foot on the accelerator, the engine revs up almost to the red on the tachometer, and immediately drops to normal. Is this normal?

 

[pvdg42]

Are you sure the engine is actually revving that high, or is it just the tach needle swinging all the way around as the instruments initialize? Mine ( a '22 SL) does rev up a bit, but not nearly as much as the tach needle swings while initializing. I suspect what you are getting is normal, but to be sure, you'd have to record the sound and post it here for expert (definitely not me) ears to hear. Or, swing by your dealer and have them look at/listen to it.

 

[Murano SL 23]

Yes, the engine is revving high. I did call the dealership and they said bring it in, no appointment needed.
Thanks for your response.

 

[pvdg42]

No prob. Dealer is the best choice while warranty is in effect (we paid for it). Best of luck!

 

[muranotim-1957]

It's normal, but the dealer will verify that for you. My 2019 does that as well, always has. The engine revs up and the tach goes high, but just for a quick moment at start up.

 

[Pilgrim]

Every newer vehicle I have revs slightly (perhaps 2500 RPM) momentarily when started, and the tach sweeps upward before settling down. I would guess it's normal.

 

[Robotaz]

Nope. It does not rev to redline on startup. It doesn’t.

 

[ace941]

That feature can be turned off if you want to see if it acturally revs up that high or not.

 

[MuranoSL2003]

Good point, I recall seeing gauge needle sweep on startup in the settings. I think I will turn if off too so that I can see the actual revs on startup.

 

[GrayHawk]

Our 2022 Murano certainly does not do that. I would see what the dealership says about fixing that. Immediately revving an engine at start up is not good.

 

[Pilgrim]

Your ears will tell you whether it's revving high. Just trust your ears. It's not a problem.

 

[Robotaz]

I thought this was a joke.

As an engineer it reminds me of the many ways “enhancing things” can just confuse some people. If there’s even one person out there that thinks a cool sweeping needle means the engine is blowing up, then there’s a problem.

Is OP hearing impaired?

 

[Cryogenix1]

My 2021 typically revs normally to 2500 and then drops smoothly to idle speed. There have been the rare times when visually and audibly the startup has exceeded the norm, and i usually attribute that to various systems that may have been on or off on that particular time which merely affected things briefly. A also think the first cold start of the day can produce a higher rev at startup, or a long period in between starting the car. With synthetic oil I wouldn't even be concerned unless it red-lined at startup and remained there in excess of a second.

I do recall my revs being higher the following day after working the steering wheel left and right to troubleshoot a noise. Perhaps the vacuum system cones into play because of that fast wheel movement prior to powering down. Perhaps that last act caused less vacuum to be retained, so on the next startup the system adjusted for that by revving higher to create more vacuum.

 

[Pilgrim]

I thought this was a joke.

As an engineer it reminds me of the many ways “enhancing things” can just confuse some people. If there’s even one person out there that thinks a cool sweeping needle means the engine is blowing up, then there’s a problem.

Is OP hearing impaired?

I felt the same way. But then, there are people who just don't "get" attributes of cars.

I remember when I bought my youngest daughter a 1991 Camaro convertible on Ebay (it turned out great, actually) and she and my wife flew to pick it up. The tach was reading much too high (common failure, quickly fixed by adding resistors in one circuit of the tach) but the high reading scared them so they drove 400 miles home at about 50 MPH. They didn't trust their ears. I knew immediately that it was revving normally when driven, regardless of the tach reading. If I had been on that trip I'd have disregarded the tach and driven normal speeds. It was an automatic so the tach was optional in any case.

 

[Robotaz]

My 2021 typically revs normally to 2500 and then drops smoothly to idle speed. There have been the rare times when visually and audibly the startup has exceeded the norm, and i usually attribute that to various systems that may have been on or off on that particular time which merely affected things briefly. A also think the first cold start of the day can produce a higher rev at startup, or a long period in between starting the car. With synthetic oil I wouldn't even be concerned unless it red-lined at startup and remained there in excess of a second.

I do recall my revs being higher the following day after working the steering wheel left and right to troubleshoot a noise. Perhaps the vacuum system cones into play because of that fast wheel movement prior to powering down. Perhaps that last act caused less vacuum to be retained, so on the next startup the system adjusted for that by revving higher to create more vacuum.

These engines have a disturbing sound at startup that is related to massive timing chains and hardware that don’t sound so great at startup, but that’s because people expect a Toyota disposable 4-banger and this is an overbuilt monster.