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Whosthat23

Oct 8, 2025 12:27 PM

2013 mustang gt strange humming noise from engine bay

1 Attachment(s)

Loud almost humming like sound coming from engine bay gets louder as I rev up. Can’t pinpoint what it is no engine codes but it just started all of a sudden on start up one morning. Attached a video file of the sound.

05stangkc

Oct 8, 2025 01:32 PM

Sounds Like a Vacuum Leak From The Vid. Some Different Ways To Look!

Use Caution if You Use The Flammable Spray!

BTMO, If Anybody Else Hears Something Different Please Chime in!

KC

Whosthat23

Oct 8, 2025 04:02 PM

Quote:

Originally Posted by 05stangkc (Post 7092865)

Sounds Like a Vacuum Leak From The Vid. Some Different Ways To Look!

https://youtu.be/uxRBViOV6DE

Use Caution if You Use The Flammable Spray!

https://youtu.be/9CPqbaSgcok

BTMO, If Anybody Else Hears Something Different Please Chime in!

KC

I tried the carb cleaner method last night couldn’t find anything I will try again. I’m seeing other forums where people are saying it could be alternator or bad pulley bearings would it make this sound. I’ve also been told could be ac compressor but it makes sound with ac off.

05stangkc

Oct 8, 2025 06:39 PM

Last Issue We Had Similar To Your Sound Was Caused By an Incorrect Catch Can Setup and The Brake Booster Was Making The Noise if I Recall Correctly.

Anything From The Intake Manifold Up and All Attached Hoses Can Be Suspect as Well.

KC

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