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Strange, long wooooo sound at steady speeds, ICE on


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228 replies to this topic

#221 OFFLINE   scottwood2

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  • Current Vehicle:2014 C-Max SE, 202A, Winter Package

Posted 15 March 2016 - 12:01 PM

I've noticed a few times that the engine puts out a "wooo" sound on. Each time I've let off the gas and the sound goes away. I don't know if it is the ANC adjusting or what. It wasn't that loud, but definitely present.

 

Just adding a data point here. It isn't worth mentioning to the dealer. I think what folks are hearing on this thread is a lot louder.

Mine is the same.  Happens about 2200 RPM.  Go above or below and it goes away.  Mine is not that bad and not always there.  As you said I think some are much more noticeable.  









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#222 OFFLINE   stevedebi

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Posted 15 March 2016 - 02:58 PM

Mine is the same.  Happens about 2200 RPM.  Go above or below and it goes away.  Mine is not that bad and not always there.  As you said I think some are much more noticeable.  

Except on long highway trips I don't have the RPM gauge up, so I don't know where it shows up.



#223 OFFLINE   fbov

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Posted 15 March 2016 - 04:58 PM

Tachometer is a My View option.



#224 OFFLINE   stevedebi

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Posted 16 March 2016 - 02:04 PM

Tachometer is a My View option.

I know, as I said, I use it on long highway trips.



#225 OFFLINE   WNY

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Posted 29 March 2016 - 07:42 PM

i have the drone/woo sounds right at 2350-2450 RPM on the scan gauge usually just under load like going up an on ramp or something if I keep it steady at that RPM. 
Usually don't notice it much with the radio on. lol
 


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#226 OFFLINE   wb8nbs

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Posted 07 July 2018 - 01:35 PM

FYI apparently Wizzurp has found a solution:

http://fordcmaxhybri...ble-anc-delete/

 

I pulled the connector he shows but my C-Max doesn't make the noise much in the summer.



#227 OFFLINE   jestevens

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Posted 09 July 2018 - 06:20 AM

Sometimes I drive with the windows down and hear this noise, probably not describing it right but to me it sounds to me like a particular exhaust note..like how they tune the exhaust sound of the Mustang.  I don't think it's intentional, probably irritates the ANC in just the right way at a certain RPM with the windows down, etc.  I have heard it inside the car with the windows up too when ICE comes on within certain RPM range.  I just take it to be part of the way the car works.

 

Maybe it just seem annoying because the car is otherwise so quiet, still not as annoying as wind buffeting noise, and no where as annoying as that rental car I drove with the 4 cylinder engine mated to a CVT that kept pretending to make noises like it was "shifting" - that thing had as much noise and vibration as a prop plane..spoiled from driving hybrids.



#228 OFFLINE   wb8nbs

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Posted 15 January 2019 - 09:28 AM

FYI apparently Wizzurp has found a solution:

http://fordcmaxhybri...ble-anc-delete/

 

I pulled the connector he shows but my C-Max doesn't make the noise much in the summer.

It's now January and I haven't heard a peep out of the ANC system. Disconnecting the microphones totally worked!

 

I am POed at Ford for not seeing this. It's clear to me that NO ONE at Ford actually knows how the noise cancelling system works. A moot point now that the C-Max has been orphaned.



#229 OFFLINE   fbov

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Posted 16 January 2019 - 04:30 PM

FWIW, no wooooo from my ANC for several years now. It was always intermittent, not showing until a trip to Vermont for Thanksgiving 2013. Then it became persistent, say once a month in winter, now gone?

 

Here's a thought. The root cause is a chassis/frame/drive train resonance that's been in cars for years, but which no one noticed as long as engine speed is constantly changing. I grew up driving a clutch, so I always listen to an automatic's shift points. My wife's Hyundai hybrid is a 6-speed. Driving a C-Max, the biggest difference initially was the lack of engine speed changes. I'm now comfortable with a car driven by a "stationary engine" designed to run a constant RPM. 

 

Designing loudspeakers, you quickly learn that resonances are a lot easier to hear than drop-outs; peaks stick out more than dips. You don't need much energy to excite them, and once they start buzzing, you can't miss it. I once measured a box with a resonance in the mid 400 Hz range, "middle A". Never heard it, except when using a frequency generator to zero in on the exact frequency!

 

Ford didn't have the luxury of only suppressing musical notes. They had a broadband source that would continuously change base frequency by a factor of 6, and stay there for a while. The driver can easily run the engine at the exact speed needed to excite any resonance. That's a tough thing to counteract. Ford did a pretty good job in my book. 

 

And the wooooo is now gone because the chassis has aged and I do have one case of very hard braking on rough road that would have loosened things up. If yours still wooooo's and you haven't pulled the mic, maybe try looking for a bumpy road?

 

Have fun,

Frank


Edited by fbov, 16 January 2019 - 04:32 PM.

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