A strange noise
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Senior User
Joined: Apr 2005
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From: southern swamps
A strange noise
Looking for ideas...my 05 6.0L F350 KR FX4 LWB has developed a noise. The engine sounds fine but the noise I hear is in addition to the engine and it sounds like a compressor or something, like maybe an air conditioner compressor, but when I turn the air off I still hear the sound. It is a steady "whine" for lack of any other way to describe it.
Any suggestions? Thanks in advance
Any suggestions? Thanks in advance
Tuned
Joined: Oct 2003
Posts: 411
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From: Oregon
Originally Posted by Labgal
Looking for ideas...my 05 6.0L F350 KR FX4 LWB has developed a noise. The engine sounds fine but the noise I hear is in addition to the engine and it sounds like a compressor or something, like maybe an air conditioner compressor, but when I turn the air off I still hear the sound. It is a steady "whine" for lack of any other way to describe it.
Any suggestions? Thanks in advance
Any suggestions? Thanks in advance
My turbo boost was around 20, EGT at 800, tranny at 180 degrees.
No loss of fluids, all hoses (especially turbo pipe (I used a sharpie pen before and outlined their position - no change).
I made an appointment for the dealer and hoping a code was set, but I can't figure it out.
Oh, of course, "Check Engine Light" goes off when I get to the dealer.
The truck ran perfectly, so I am really stumped as to what caused it. Tried to duplicate the sound unloaded - no dice.
Under heavy load, with my foot in it going up hill I would get a fan sound, but I understand that is normal. I wonder if that is what you heard.
Post Fiend
Joined: Jul 2005
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From: 21791
chiefGReid, the noise you hear is normal. it happens because you are producing alot of boost, and then all of the sudden, the throttle is closed (or narrowed). the boost has to escape out somewhere, so it hisses into the intake manifold or backwards through the turbo and out the airfilter. (remember the turbo is an air compressor, so thats why it sounds that way)
Tuned
Joined: Oct 2003
Posts: 411
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From: Oregon
Originally Posted by strokin_it7.3
chiefGReid, the noise you hear is normal. it happens because you are producing alot of boost, and then all of the sudden, the throttle is closed (or narrowed). the boost has to escape out somewhere, so it hisses into the intake manifold or backwards through the turbo and out the airfilter. (remember the turbo is an air compressor, so thats why it sounds that way)
Post Fiend
Joined: Jul 2005
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From: 21791
was it the main radiato fan kicking on? were you towing at a slowER speed then normal (like 35-50 mph) where the radiator wasn't cooling fast enough, causing the temps to skyrocket, the fan kicks on and the check engine light comes on too? did you note the position of the engine temperature gauge in the dash?
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From: southern swamps
ChiefG, it's not a fan sound and I've had my truck under heavy load a number of times thus far...but this sound happens pretty constantly, yet I've only noticed it for the last few weeks all told.
Kepler4, it might be the power steering pump, if so, does this mean perhaps the fluid is low or something? My truck is a 3/05 build and I got it as soon as it hit the dealer...so it's not "very old" yet. LOL. I really have just heard this sound in the last couple of weeks is all. Until then, just that sweet diesel purr.
Kepler4, it might be the power steering pump, if so, does this mean perhaps the fluid is low or something? My truck is a 3/05 build and I got it as soon as it hit the dealer...so it's not "very old" yet. LOL. I really have just heard this sound in the last couple of weeks is all. Until then, just that sweet diesel purr.
Last edited by Labgal; Jul 22, 2005 at 09:24 PM.
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Tuned
Joined: Oct 2003
Posts: 411
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From: Oregon
Originally Posted by strokin_it7.3
was it the main radiato fan kicking on? were you towing at a slowER speed then normal (like 35-50 mph) where the radiator wasn't cooling fast enough, causing the temps to skyrocket, the fan kicks on and the check engine light comes on too? did you note the position of the engine temperature gauge in the dash?
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Jäger
Joined: Jan 2005
Posts: 5,491
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From: Northern Arizona
Labgal,
I just noticed the noise around 4,000 miles, I'ts at 4950 now. My truck is a 4/05 build. Guess I better check the fluid level too! It sounds just like the PS pump on my Bronco, I usually hear it at idle speeds or when 'coasting down' at slow speeds in city traffic.
I just noticed the noise around 4,000 miles, I'ts at 4950 now. My truck is a 4/05 build. Guess I better check the fluid level too! It sounds just like the PS pump on my Bronco, I usually hear it at idle speeds or when 'coasting down' at slow speeds in city traffic.