Weird sound

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Jul 4, 2009 | 06:55 PM

steve_speak

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Weird sound

As can only happen on July 4th, I got my truck running but it hear a "whistling sound" like the you in "Oh say can youoooooooo".

I start to hear the sound after the truck is running for around 10 seconds. It's faint...then again ...the truck is running. When I shut the truck off, the ooooo sound gets deeper and stops aprox 2 seconds after the motor is stopped.

I can't locate the sound...though I'll try more tomorow. I just put rebuilt heads on the engine. Do you think it could be the vacumn canister? How about the smog pump? The may be a leak from the exh manifold to the pipe.

Thanks in advance.

Jul 4, 2009 | 07:16 PM

dustybumpers

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From: In my own world

if the sound continues after the truck is shut off, I would guess either the brake booster, or the vaccume reserve can. being you just did the heads, I would check all the vaccume hoses, lines etc, and look for someyhing broken, or disconnected

Jul 4, 2009 | 08:02 PM

ssquints999

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From: okc,oklahoma

what year truck and motor?
my truck makes that kind of sound when i turn it off it's caused by a vacuum diaphram up by the coil.

Jul 4, 2009 | 09:27 PM

steve_speak

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Really...could it acutally be normal????

ssquints999 says it happens with (his) truck. I've never really had this truck running in "quiet" mode. I bought it with two cracked exh manifolds so it's always been loud. Now that I've got it rebuilt I'm hearing things that I never have heard before. It may have always been there.

So, I'm torn...should I keep looking for the sound and then fix it...or should I just let it be?

My truck: 1996 F250 0ver8500#

Jul 5, 2009 | 09:27 AM

dustybumpers

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From: In my own world

my 90 f250 with 351 has been makeing a buzzing sound when you shut it off since new. ford said it was normal. only lasts a few seconds

Jul 5, 2009 | 09:32 AM

steve_speak

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Thanks Dusty...I'm almost convinced this may be OK. Though my sound is not a buzz...it's more "tonal". I keep going back to the

youoooooooooooo. I'm going to record it today and I post a link to the sound/video. Maybe someone has heard this before.