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Whats this noise???

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Old Jul 15, 2009 | 10:00 AM
  #1  
padec21's Avatar
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Whats this noise???

Going up hills or just under any load I hear a l slight psst psst psst kinda noise. No rithym to it just random for a few seconds then stops. Almost like when you let air out of tires but def. not that. All gauges read normal, truck isnt losing any power, tach is normal. I just here this noise. I hear it very loudly with driver window open. Sounds like coming from behind pedal area. Any ideas????
truck is a 2001 lariat F250 CC with v-10. 57k on odo. Please help. I cant live with a noise!
 
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Old Jul 15, 2009 | 08:40 PM
  #2  
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check ur spark plugs for tightness and proper torque values..

hearing a hissing is a good sign a plug is ready to pop out...
 
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Old Jul 16, 2009 | 12:09 PM
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That, and broken exhaust manifold bolts.
 
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Old Jul 16, 2009 | 07:08 PM
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Looking through fender well all exhaust studs appear ok. No missing nuts or broken studs.
What is the maximum allowable torquage for spark plugs?
 
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Old Jul 16, 2009 | 09:29 PM
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I'd go about 14ft/lbs. There are those who say something like 28, but they don't visit this site
 
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Old Jul 16, 2009 | 11:28 PM
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dam 28 sounds kinda high...
 
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Old Jul 17, 2009 | 11:15 PM
  #7  
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I am the only owner of my truck and have had the noise since it was new. Dealership had it for a week and couldn't figure out the noise. Had a recording device hooked to my computer to turn on when it made the noise, and they couldn't determine what it was. I can make mine do it on request. Usually under a load at 1800-2000 RPM with a light throttle. Sounds kind of like a relief valve on an air tank letting off pressure. I have 110,000 miles on my truck and it still runs strong. I guess it isn't anything too major.
 
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Old Jul 18, 2009 | 11:49 AM
  #8  
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Could be just the "Y" pipe and you're not used to it. How long have you owned the truck?
 
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Old Jul 19, 2009 | 06:07 PM
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i bet it is exhaust flutter...my sweet spot for that is about 1800rpm-2200rpm's. when i first heard mine i thought i had picked up some bad fuel and freaked out, thats when i came to this site researched it then relaxed after i checked my plugs.
 
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Old Jul 19, 2009 | 09:45 PM
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Originally Posted by Big Orn
Could be just the "Y" pipe and you're not used to it. How long have you owned the truck?
Hey!

Originally Posted by krusterzf-350
i bet it is exhaust flutter...my sweet spot for that is about 1800rpm-2200rpm's. when i first heard mine i thought i had picked up some bad fuel and freaked out, thats when i came to this site researched it then relaxed after i checked my plugs.
That's a good point.
 
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