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Thread: Loud intake noise suddenly

  1. #1
    Join Date
    Feb 2005
    Location
    Clermont Florida
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    Loud intake noise suddenly

    About a month ago car started to have idle problems. It was bad when cold and got better when the car was closed loop but still rough. I replaced the IAC solenoid and that made it better but not fixed. I figured the car needed time to learn. Drove today to get gas and the woman at the pump kept looking at my car with a puzzled look. I turned the radio off I I could hear a lot of intake noise like a small trumpet was stuck in my intake. Idle was good. I think I may have gotten a bad IAC but is there anything else that could cause this? Car had 140k on it. This is the first thing I have replaced on the intake. Still original EGR, checked the PCV valve and it was clean and free. Not sure what else to try.
    If you’re in control, you’re not going fast enough. – Parnelli Jones

    If your wife's having a good time and you're not, you're still having a better time than if you're having a good time and she's not. - Red Green

    2004 Marauder 300A - Garage Queen

    1025 of 3213. It is one of 1237 in black and one of 2000 w/o the moonroof option.

    Performance
    4:10's, rear Adco, front Eibachs w/ KYB shocks, Working oil pressure gauge, JLT CA Kit, Fumoto Oil Drain Valve, TCE SS Brake Lines, Zack big brake kit.
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    Power by Ford coil covers, Maruder sill plates, God's head steering wheel emblem, spoiler, front and rear splash gaurds, Custom dead pedal, LED lights for engine bay, interior and gauges. 64' Marauder Sail Panel for rear badge, custom God's head badge in grill.

    LOC: Clermont Florida

  2. #2
    Join Date
    May 2019
    Location
    Harrisburg, NC
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    53
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    364
    I can't recall what this part is called, but it gave me problems similar to yours and then after a couple weeks my car wouldn't start at all. Might not be what your issue is, but maybe something else in that area...
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  3. #3
    Join Date
    Jun 2011
    Location
    Northeast OH
    Posts
    7,999
    Any codes,CEL ? Whistling could be vac leak, air intake leak. Whistling can also be a pulley,idler. Kinda sounds like a centri unit. Does sound pitch change with throttle?
    2004 SB Ported Trilogy 48
    Has supporting mods and stuff
    Thanks to Marty O for his help in updating this car.

    R.I.P.
    Rex "SC Cheesehead"

  4. #4
    Join Date
    Feb 2005
    Location
    Clermont Florida
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    2,043
    No codes, No cracked or broken hoses. I did a live data scan and I see that the IAC is in learn mode which makes sense but it is at 50% activation which I think is normal. The only issue I see in the data stream is one of my O2 sensors is going bad. I may buy another IAC and this time go for the Motorcraft part and see if that fixes it. Bought an aftermarket last time.
    If you’re in control, you’re not going fast enough. – Parnelli Jones

    If your wife's having a good time and you're not, you're still having a better time than if you're having a good time and she's not. - Red Green

    2004 Marauder 300A - Garage Queen

    1025 of 3213. It is one of 1237 in black and one of 2000 w/o the moonroof option.

    Performance
    4:10's, rear Adco, front Eibachs w/ KYB shocks, Working oil pressure gauge, JLT CA Kit, Fumoto Oil Drain Valve, TCE SS Brake Lines, Zack big brake kit.
    Dress
    Power by Ford coil covers, Maruder sill plates, God's head steering wheel emblem, spoiler, front and rear splash gaurds, Custom dead pedal, LED lights for engine bay, interior and gauges. 64' Marauder Sail Panel for rear badge, custom God's head badge in grill.

    LOC: Clermont Florida

  5. #5
    Join Date
    Mar 2008
    Location
    Next door to my neighbor
    Age
    50
    Posts
    20,353
    Check the vacuum lines under the throttle body.


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  6. #6
    Join Date
    Feb 2005
    Location
    Clermont Florida
    Age
    57
    Posts
    2,043
    I did some searches and the Mach 1 boards all agree that all of the aftermarket IAC's trumpet. I dropped the money on a Motorcraft replacement. Will update once installed.
    If you’re in control, you’re not going fast enough. – Parnelli Jones

    If your wife's having a good time and you're not, you're still having a better time than if you're having a good time and she's not. - Red Green

    2004 Marauder 300A - Garage Queen

    1025 of 3213. It is one of 1237 in black and one of 2000 w/o the moonroof option.

    Performance
    4:10's, rear Adco, front Eibachs w/ KYB shocks, Working oil pressure gauge, JLT CA Kit, Fumoto Oil Drain Valve, TCE SS Brake Lines, Zack big brake kit.
    Dress
    Power by Ford coil covers, Maruder sill plates, God's head steering wheel emblem, spoiler, front and rear splash gaurds, Custom dead pedal, LED lights for engine bay, interior and gauges. 64' Marauder Sail Panel for rear badge, custom God's head badge in grill.

    LOC: Clermont Florida

  7. #7
    Join Date
    Feb 2005
    Location
    Clermont Florida
    Age
    57
    Posts
    2,043
    Got the Motorcraft IAC today and swapped out the no name aftermarket and presto...noise gone and idle is smooth.
    If you’re in control, you’re not going fast enough. – Parnelli Jones

    If your wife's having a good time and you're not, you're still having a better time than if you're having a good time and she's not. - Red Green

    2004 Marauder 300A - Garage Queen

    1025 of 3213. It is one of 1237 in black and one of 2000 w/o the moonroof option.

    Performance
    4:10's, rear Adco, front Eibachs w/ KYB shocks, Working oil pressure gauge, JLT CA Kit, Fumoto Oil Drain Valve, TCE SS Brake Lines, Zack big brake kit.
    Dress
    Power by Ford coil covers, Maruder sill plates, God's head steering wheel emblem, spoiler, front and rear splash gaurds, Custom dead pedal, LED lights for engine bay, interior and gauges. 64' Marauder Sail Panel for rear badge, custom God's head badge in grill.

    LOC: Clermont Florida

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