possible leak? - MustangForums.com

Go Back   MustangForums.com > Ford Mustang Tech > 2005-2014 Mustangs > S197 Shelby Section

S197 Shelby Section This section is for technical discussions pertaining specifically to the latest installment of the Shelby Mustangs; the Shelby GT, the CS6, and the awesome GT500.

possible leak?

Thread Tools Search this Thread
Old 04-09-2016, 03:50 PM   #1
dboonem's Avatar
Join Date: Jun 2014
Vehicle: 2011 bmw m3
Location: texas
Posts: 2
Default possible leak?

just recently noticed i no longer build boost while accelerating, psi will push to 0 to 3 psi then drop back to zero while in high rpms, this is in all gears. When purchased i could hear a defined whine from the supercharger which is no longer present.

I also recently started to notice a depressurization noise ? when turning off the car seems like its coming under or near the air filter/box, attached is a vid of said noise.

stock 2010 gt500
dboonem is offline   Reply With Quote
Old 04-13-2016, 10:14 AM   #2
4th Gear Member
kenthicken's Avatar
Join Date: Aug 2006
Vehicle: 2008 Roush 427R
Location: Los Angeles, California
Posts: 1,267

Sounds like belt slip. Tensioner?

2008 Roush 427R #365
Vapor / Gray - 1 of 12
kenthicken is offline   Reply With Quote
Old 04-13-2016, 11:31 AM   #3
5th Gear Member
jwog666's Avatar
Join Date: Mar 2008
Vehicle: 03 mustang gt
Location: wisconsin
Posts: 2,253

the noise you hear from the air box is normal, its caused by cylinder pressure escaping back into the intake and air inlet system past a partially open intake valve after the engine has been shut off. if you are using factory gauge to determine your boost, remember they arent very accurate, to be sure you would need an actual boost gauge to verify

Kenne Bell 2.1 Twin Screw (9 PSI), Kenne Bell Big tube kit, BBK off road x pipe, Flowmaster super 44's, Snow Performance stage 2 MAF Boost Cooler, Walbro 290lph fuel pump, 40A Boost-A-Pump, Steeda tri-ax, 3.73's, Spec stage 1 clutch, Eibach swaybars, tail light sequencers, smoked headlights, LED bulbs 400HP 449TQ as of 10/2015 at the rear wheels. It feels good to be blown.

Last edited by jwog666; 04-13-2016 at 11:34 AM.
jwog666 is offline   Reply With Quote


Similar Threads
Thread Thread Starter Forum Replies Last Post
Whining noise from the engine and the check engine light came on Tyler Bohannon V6 (1994-2004) Mustangs 3 03-28-2016 01:37 PM
Whining noise and the check engine light came on Tyler Bohannon V6 General Discussion 2 03-28-2016 01:34 PM
2010 GT With 2013 Headlights. Having problems! Greg251 General Tech 0 03-27-2016 10:04 PM
Creaking noise when turning steering wheel at low speeds??? Rocket254 4.6L V8 Technical Discussions 5 03-26-2016 03:40 PM
Not building boost with Vortech, Boost Leak Test Passed LemensTS Pipes, Boost & Juice 1 03-17-2016 10:05 PM

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump


All times are GMT -5. The time now is 01:47 PM.

This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. FordŽ is a registered trademark of the Ford Motor Company