Mystery Whine in 2014 Equinox - TerrainForum.net: GMC Terrain Forum
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post #1 of 5 (permalink) Old 12-07-2019, 08:47 PM Thread Starter
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Mystery Whine in 2014 Equinox

Hi all,

I've got a mystery whine that has stumped me and mechanics for almost a year. A bit of background, I have a 2014 2.4L Equinox (Flex Fuel) with 181k miles (it was a fleet vehicle prior to our purchase). Despite the mileage it runs very well, I change the oil every 3k miles at minimum and am diligent about all other maintenance.

About 9 months ago, I started hearing a chatter/whine while idling, as soon as I go above ~1k RPM the noise stops. I initially replaced the belt tensioner since the serpentine belt was due anyway, but no change. Using a stethoscope I can hear it clearly on the engine near the coolant hose above the alternator, next to the engine mount bolts. I can't tell if it's resonating from somewhere else, or this is actually the source. The alternator doesn't seem to be the cause, and is putting out the right voltage. It isn't a consistent noise, as you can hear in the video, and isn't synced to RPM.

It's a bit louder when idling on a hill, happens in all weather conditions, and happens whether or not the AC/air is on.

Very recently the car has starting idling a bit rougher, despite an oil change, but I'm not sure if this is related. The video below is a good indicator of what I hear all the time. Any help would be much appreciated!

https://streamable.com/6i5bc
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post #2 of 5 (permalink) Old 12-08-2019, 10:28 AM
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The 2.4 has been known to need new timing chains and guides on high mileage vehicles.
Just a guess not knowing it's service history.

2014 Equinox LTZ FWD 3.6L. V-6 (LFX)
GM6T70 Transmission-Gen II(M7W)
Crystal Red Tintcoat-Brownstone Leather-(FE2) Suspension-18" Wheels
Build Date: Nov. 04, 2013-Delivery Date: Nov. 25, 2013
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post #3 of 5 (permalink) Old 12-08-2019, 12:51 PM Thread Starter
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Quote:
Originally Posted by rednox301 View Post
The 2.4 has been known to need new timing chains and guides on high mileage vehicles.
Just a guess not knowing it's service history.
Yeah I've heard as much, I can try to get the service records for more information. Would the timing chain make the noise only on idle? I figured it would get worse with higher RPMs.
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post #4 of 5 (permalink) Old 12-08-2019, 01:31 PM
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Just to eliminate any accessory drive concerns, AC, alternator, idlers or water pump; you could temporarily disconnect the belt and run it briefly. If the noise is still there, it's internal.

.
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2019 Chevy Equinox; 2.0 - LT - FWD - Silver Ice/Redline - Purchased 10/20/2018; Mills Chevrolet, Davenport IA
2016 Chevy Equinox; 3.6 - LTZ-AWD - Black/Black - Purchased 7/7/2016; Mills Chevrolet, Davenport IA
2017 Chevy Malibu; 1.5 - LT - Pepperdust - Purchased 8/2017; Green Chevrolet, East Moline, IL
2009 Chevy Silverado; 5.3 -LT - 4WD - Ext. Cab - Granite Met. - Purchased 02/2009; Green Chevrolet, East Moline IL
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post #5 of 5 (permalink) Old 12-19-2019, 07:55 PM Thread Starter
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Thank you all for your replies, and sorry for the late response. I believe it is indeed the timing chain, and once the weather warms up I'll end up replacing the chain and tensioners/guides.
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