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1 votes

Strange, long wooooo sound at steady speeds, ICE on

Started By Alex Sams , Jan 25 2014 11:52 PM

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226 replies to this topic

#221 OFFLINE scottwood2

C-Max Hybrid Member

C-MAX Hybrid Member
579 posts

Region:U.S. Great Lakes
LocationMetro Detroit
My C-MAX's Year:2014
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

C-Max Hybrid Member

C-MAX Hybrid Member
842 posts

Region:U.S. Pacific Coast
LocationLA
My C-MAX's Year:2014
Current Vehicle:2014 C-Max Energi

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.

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#223 OFFLINE fbov

C-Max Hybrid Member

C-MAX Hybrid Platinum Member
1,430 posts

Region:U.S. Northeast
LocationRochester, NY
My C-MAX's Year:2013
Current Vehicle:C-Max Hybrid

Posted 15 March 2016 - 04:58 PM

Tachometer is a My View option.

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#224 OFFLINE stevedebi

C-Max Hybrid Member

C-MAX Hybrid Member
842 posts

Region:U.S. Pacific Coast
LocationLA
My C-MAX's Year:2014
Current Vehicle:2014 C-Max Energi

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.

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#225 OFFLINE WNY

C-Max Hybrid Member

C-MAX Hybrid Member
112 posts

Region:U.S. Northeast
LocationCuba, NY
My C-MAX's Year:2013
Current Vehicle:F150,Mustang, Escape

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

ptjones likes this

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#226 OFFLINE wb8nbs

C-Max Hybrid Member

C-MAX Hybrid Member
53 posts

Region:Decline
Location60565
My C-MAX's Year:2013
Current Vehicle:C-Max

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.

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#227 OFFLINE jestevens

C-Max Hybrid Member

C-MAX Hybrid Member
286 posts

Region:U.S. Northeast
LocationPennsylvania
My C-MAX's Year:2013
Current Vehicle:C-MAX SEL Hybrid

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.