Hissing sound from back of engine near firewall

2009 FORD CROWN VICTORIA
174,000 MILES • 4.6L • V8 • RWD • AUTOMATIC
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GROVESIE
  • MEMBER
  • 1 POST
when i am driving and when i turn the car off there is a hissing sound that lasts a couple seconds when i turn it off. i hear the sound continuously when driving. I am sure its not the throttle body, radiator or any hoses near the throttle body....... it seems to be down behind somewhere.
Jul 17, 2014 at 6:52 AM
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HMAC300
  • ✓ASE Certified Mechanic
  • 48,601 POSTS
  • ASE Certified Mechanic
check for a vacuum hose off or a vacuum can leaking
Jul 17, 2014 at 9:42 AM
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