Weird Noise At Idle
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Senior User
Joined: Mar 2005
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From: Lake Havasu City, AZ
Weird Noise At Idle
I have a 1999 F-250 Super-Duty V10 with 128k miles. Runs strong and I love it. Recently it has a weird whining noise coming from somewhere under the hood at Idle. I notice this only when the engine is at normal operating temperature and idling. If I gas slowly in park the whine goes away then re-apprears while coming back down to idle. I've checked a few vacuum hoses and can't locate the whining noise. Any suggestions? I'd appreciate any help. Thanks,
Mike
Mike
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Joined: Jul 2002
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From: Long Island USA
Check the belt idler pulleys. I've personally changed them once on my V10, and twice on my 4.6L's each. They don't go "bad" per-se, but for whatever reason, they either chirp or whine and I can't stand the noise 
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Senior User
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From: Lake Havasu City, AZ
Pulleys are fine. It's some kinda whistling noise like a hole in a vacuum line or something. I don't know, I'll have to locate the noise somehow. The noise isn't always there. It does this just sometimes.
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From: Lake Havasu City, AZ
good idea, I will check that. I'll report back once I locate the problem. Thanks again for all the responces.
Mike
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Art, could those idler pulleys cause what sounds like a rattling in the serpentine belt area, under high RPMs, or in overdrive, around 1,100 RPMs?
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From: Lake Havasu City, AZ
Update,
Found the problem. A collapsed vacuum hose underneith the throttle body. This hose then attaches to the PVC valve on the passenger side valve cover. Someone had this hose running underneith the throttle cable assembly and was so pinched it was almost in a V shape form. The hose had gotten very hot from laying on top of the intake manifold. I have a temporary hose in place right now but it's only a matter of time before the heat from the manifold deforms it and I'll have failure again. What are you guys using for a vacuum hose in this location?
Found the problem. A collapsed vacuum hose underneith the throttle body. This hose then attaches to the PVC valve on the passenger side valve cover. Someone had this hose running underneith the throttle cable assembly and was so pinched it was almost in a V shape form. The hose had gotten very hot from laying on top of the intake manifold. I have a temporary hose in place right now but it's only a matter of time before the heat from the manifold deforms it and I'll have failure again. What are you guys using for a vacuum hose in this location?
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Joined: Mar 2005
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From: Lake Havasu City, AZ
I need to do that. Whats the deal with a 3/4 hose being so hard to fit in that vacuum fitting underneith the throttle body? What a pain. Took me almost a 1/2 hr to get it to fit, and on top of all that this hose is too close to the intake manifold. It's only a matter of time before it cooks the hose again. Bad design it looks to be.
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Joined: Feb 2004
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From: IL
The replacement elbow for the 6.8L was to tight/small in diameter to work imo. I too had a heck of a time with it, never could get it on. Read on a thread here about the elbow off a 5.0L working and went with that instead and it worked fine. Still holding up! As for design, we've got what we got best to just live with it I suppose.
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