Hissing
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Senior User
Joined: Nov 2000
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Hissing
95 f250 351. if i take my foot off the gas, or if i accell (going over 35 mph) i hear i hiss from the right side. if im in between it goes away. sounds like a vacume leak but i checked my vacume lines and they are good. any ideas?
Senior User
Joined: Sep 2004
Posts: 484
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From: SC lowcountry
The air management system will release excess air from air pump at various conditions thru a muffler on right front inner fender well - has a hose thet goes down to bottom of inner skirt. This could be what you are hearing - I just never hear mine or have been able to pick out the exhausted air noise. You might check the condition of muffler and hose to be sure it is ok. Follow the rubber hose off the air pump to valves, then to muffler; I think it's plastic with metal end caps to the corrugated exhaust hose out of muffler.
With no adverse symptoms, I wouldn't worry about it.
With no adverse symptoms, I wouldn't worry about it.
