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      02-16-2018, 10:40 AM   #1
mirob
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Need help with weird howling noise. (Video included)

Car has been running flawlessly for about a year so I knew something was coming.

Anyhow, it's making a weird howling-type of noise when idling. Gets louder with slight RPM increase (i.e., turning on AC). Goes away with stabing the throttle. I only notice it when car is warmed up, never after cold start.

I tried to locate the source with a stethoscope without any luck (only around engine bay, have not lifted the car to listen underneath). Suspected bad serpentine belt but I don't think that's it. Transmission going out (shifts smooth and crisp)? Engine oil pump? Transmission oil pump? Torque converter slipping?

I figured I'd start here before I go to a dealer or indy.

Here's a video of the sound, hope you guys can make out what I'm hearing.

Any help would be appreciated.

Thanks.



UPDATE:
Indy is 95% certain that it's the Bank-2 (driver's side) turbo. They were able to trace the noise up the exhaust and to the turbo. They don't believe it's the bearing but rather that the wastegate is not fully opening and/or closing, thus creating that noise.

I'm not convinced.

Last edited by mirob; 03-09-2018 at 07:49 AM..
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      02-16-2018, 02:43 PM   #2
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Sounds like a bad pulley bearing. I'd start with those if you have miles on your X. I'm not sure how many the 5.0M have on them. Maybe 2 or 3. Usually pretty cheap and easy to fix if you can yourself.
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      02-18-2018, 08:17 PM   #3
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Coyote under the hood for sure, seen it b4 - vids on YouTube, go look
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      02-19-2018, 07:22 AM   #4
mirob
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Quote:
Originally Posted by Steadyspeed View Post
Sounds like a bad pulley bearing. I'd start with those if you have miles on your X. I'm not sure how many the 5.0M have on them. Maybe 2 or 3. Usually pretty cheap and easy to fix if you can yourself.
Very possible. I can do the work myself but I want to be sure before I start tearing into things and wasting time and money. I'll probably still have an indy look at it.

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Originally Posted by Entr0py View Post
Coyote under the hood for sure, seen it b4 - vids on YouTube, go look
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