2001 Bullitt Humming Noise at idle - Ford Mustang Forum
 
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post #1 of 8 (permalink) Old 01-21-2014 Thread Starter
TMI
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2001 Bullitt Humming Noise at idle

Hi all, My Mustang makes a very loud humming noise after it's warm and the engine goes near idle speed. It doesn't matter if i'm doing 40mph in neutral, or sitting still at a stoplight: when the engine is warm and goes near idle speed, it makes this humming noise.

The car doesn't do it when it's cold. It's also most definately coming from the air filter/intake area. Anybody know what my most likely problem is?

It seems like the only way a sound like this could be made is through vibration like a wind instrument?

Video Link Ford 4.6 Sohc Humming Noise - YouTube

Thank you

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post #2 of 8 (permalink) Old 01-22-2014
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hows the idle ?IAC valve ?

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post #3 of 8 (permalink) Old 01-22-2014
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Have you tried taking the intake tube and filter off the car and see if there is something wrong with it?

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post #4 of 8 (permalink) Old 01-24-2014
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That definitely sounds like your ccrm mounted inside your fender. Check your fuses. If it were your ccrm though, it would probably be humming even with key on without the engine running.

I am the proudest member of the FIGHTIN' TEXAS AGGIE CLASS OF 2010, Whoop!! Thanks and Gig Em

-2001 Dark Highland Green Mustang Bullitt #3064,
Vortech Charged 32V. 533 rwhp, 456 ft-lb @ 15 psi boost

-1969 Mustang Grande: House fire, RIP
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post #5 of 8 (permalink) Old 01-25-2014 Thread Starter
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Hi everyone thanks for the replies and help-

It turns out it is either my IAC valve, or the black box (I think it's a filter) that is right before the IAC valve. I too, thought it would have been the intake, but I took the filter and the housing for the filter off and the car still did it. While the car was making the humming noise, I squeezed the tube going from the intake to the IAC valve, and the car stopped the humming.

However upon doing that, I realized that my intake filter and intake housing is totally shot. The upper part of the intake before the filter is completely fine. The black cover is all cracked and warped (not a perfect circle) so the intake can't get a good seal. Stupid previous owner!!

To fix the intake problem, I was thinking of buying a JLT Next Gen intake because I can't for the life of me find OEM parts for Bullitts!! Do you guys know of any sites that have OEM parts?

I'm also looking for replacement shocks (currently has shot but stock tokico's) but can't find Tokico's like on my Bullitt. I was wondering if there is a reason for that? Are they not good? Could someone lead me to a better shock out there?

I want the car to perform the best it can at the autocross and on canyon roads. I don't care about ride quality either.

So I guess I leave the post with this shopping list:

1.) IAC Valve
2.) Cold air Intake or OEM Intake if I can find one (help!)
3.) Replacement or stock shocks that are built for autocrossing (help)

If you guys could lead me in the right direction here it would be much appreciated!

Thanks
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post #6 of 8 (permalink) Old 01-27-2014
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I may just still have my Bullitt's factory filter housing with filter if you want to purchase it....I'll have to check and I know I'll never use it again. Have you tried cleaning your IAC? Not a sure fix but will probably buy you a little time before you absolutely have to get a new one. I'm not a pro on suspension for these cars, most anything is better than the factory ones I would imagine.

I am the proudest member of the FIGHTIN' TEXAS AGGIE CLASS OF 2010, Whoop!! Thanks and Gig Em

-2001 Dark Highland Green Mustang Bullitt #3064,
Vortech Charged 32V. 533 rwhp, 456 ft-lb @ 15 psi boost

-1969 Mustang Grande: House fire, RIP
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post #7 of 8 (permalink) Old 01-30-2014 Thread Starter
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Just an update..

Bought a new IAC valve and the humming is gone. Car also drops RPM'S faster when shifting. I also learned that the GT IAC valve does not work for a Bullitt intake.

I wasn't able to find a clear answer to that question, so I thought I would post the answer.

Thank you all for the help
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post #8 of 8 (permalink) Old 01-31-2014
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Glad you got it taken care of!

2000 GT 5 speed
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