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Please help me identify this noise... #5350168 02/14/20 05:32 PM
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Navi Offline OP
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My Navigator sat all day and its 25 degrees F out. I started it remotely and I start to hear a screaching noise coming midship. Its not coming from the engine but midship around the transmission area. After it warms up a bit the noise seems to go away.

This condition is not related to my prior issues or repairs. I heard this whirring a while back and now its simply got much louder.


Re: Please help me identify this noise... [Re: Navi] #5350177 02/14/20 05:45 PM
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A_User55555 Offline
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If you touch the exhaust, does the exhaust vibrate with the sound?

It could also be an AIR Pump going bad. Or Compressor for the Air shocks.

Any Lights on the Dashboard?

Last edited by A_User55555; 02/14/20 05:46 PM.

2011 Cadillac DTS. No the headgaskets have not blown.....
5W-30 Valvoline Full Synthetic with a Purloator Boss PBL25288 Filter
Re: Please help me identify this noise... [Re: Navi] #5350180 02/14/20 05:47 PM
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Navi Offline OP
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This doesnt have airshocks. It has electronic shocks similar to GMs magnetic ride.

Re: Please help me identify this noise... [Re: Navi] #5350181 02/14/20 05:49 PM
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loneryder Offline
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Cat heat shield?

Re: Please help me identify this noise... [Re: Navi] #5350210 02/14/20 06:42 PM
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Blkstanger Offline
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Cold weather rattle. It happens.


99 Jeep WJ 4.7 200,000mi. Maxlife 10w30, Fram Ultra.
15 Ford Escape S 2.5 Castrol Edge EP 5w30 Fram Ultra.
Re: Please help me identify this noise... [Re: Navi] #5350240 02/14/20 07:33 PM
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PowerSurge Offline
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Sounds like the ecoboost cold startup turbo rattle. https://www.youtube.com/watch?v=4t-Fik8-bUQ
Hopefully I’m wrong and it’s just a heat shield.


1993 Porsche 964, 2001 Ford SVT F-150 Lightning, 2004 Chevrolet Corvette, 2018 Toyota Tundra and a few others
Re: Please help me identify this noise... [Re: Navi] #5350262 02/14/20 07:51 PM
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Eddie Offline
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Sounds like a pump of some sort. Ed


2014 CX5 Touring 2.5L :-)
Re: Please help me identify this noise... [Re: loneryder] #5350330 02/14/20 09:26 PM
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spasm3 Offline
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Originally Posted by loneryder
Cat heat shield?


That what it sounds like to me. Some sort of heat shield vibration. Or possibly some weird exhaust flange leak.

Last edited by spasm3; 02/14/20 09:27 PM.

13 elantra 81k 5w30 synpwr
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Re: Please help me identify this noise... [Re: Navi] #5350336 02/14/20 09:34 PM
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Navi Offline OP
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Its probably the wastegate.

Re: Please help me identify this noise... [Re: Navi] #5350368 02/14/20 10:06 PM
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Driz Offline
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Try a mechanics stethoscope on that to zero in closer. That sound will be vastly different as you get close to it. It might be a heat shield rattle but to me it sounds like some shaft scrubbing at the speed the engine is turning.
Pulleys and serpentine belt tensioner bearings makes noises like that when they start to die ( as they often do) though you’d think that to be coming from the front of the engine. Still, noises can sound like they are coming from some other place sometimes.

Re: Please help me identify this noise... [Re: Navi] #5350594 02/15/20 08:23 AM
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joekingcorvette Offline
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Sounds like a bad belt or alternator but you stated its not coming from the engine. I am leaning towards something with the exhaust or convertor.


2005 Chevrolet Corvette
2014 Ford F-150 4x4 supercrew
2014 Jeep Grand Cherokee Limited (wifes)
2012 Honda Civic 4 door (my daily driver)
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