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But its a kind of whistling when you suck air in, not blow it out. Its intermitent, and does get a little louder with a higher idle. It sounds like its coming from the front of the motor. Checked around, hard to tell where coming from. Anyone ever had this noise, sounds like a steam whistle from an old train, but not as loud, but loud enough to be heard while driving?
 

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A little elf may have installed a supercharger while you were asleep last night. I would bet on it.
 

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But its a kind of whistling when you suck air in, not blow it out. Its intermitent, and does get a little louder with a higher idle.
Can it do the theme song to The Andy Giffith Show? That would kick ass:rockon
If it does it while sitting still, how about vacuum lines, fan, intake tube, etc?
 

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OOPS GIVE A DAMN IS BROKE
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But its a kind of whistling when you suck air in, not blow it out. Its intermitent, and does get a little louder with a higher idle. It sounds like its coming from the front of the motor. Checked around, hard to tell where coming from. Anyone ever had this noise, sounds like a steam whistle from an old train, but not as loud, but loud enough to be heard while driving?

check your vac lines and check your fan and sure it turns freely. but more than likely it is a vac leak.
 

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My EGR Valve whistles sometimes......I just lubed the shaft and it slides smoothly now! :hump :hump
 

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OUT OF BUSINESS / M.I.A
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Pulled codes on the F350 yesterday--- seems that both left and right engine banks were running lean. Started her up and slowly started jiggling all the air/vac hoses. Sure as shhit, a bad 3/8" ninety degree hose to the pvc. Found a similar shaped hose at Kragens from the Help rack (part #46001) for $4.00 and customized it to fit. Big difference right there...........
 
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