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Loud humming noise

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Old 08-31-2011, 12:22 PM   #1
2003 Explorer 4.6
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US Loud humming noise

I have a 2003 explorer with the 4.6 engine. It was stalling out on me when I released the gas pedal. I replaced the IAC value and it ran great for about 2 weeks. Then a loud humming noise started. It is coming from the air filter box. It doesn't do it when I'm driving just while I'm idle while in gear. But it will do make the noise sometimes while in park. Sometimes it stalls out too.
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Old 08-31-2011, 12:59 PM   #2
Ottawa, Ontario
2006 Explorer XLT 4.0 4x4
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Did you unplug the battery for 20 minutes or so after changing the IAC? If not then I would try that, which will force the PCM to relearn the fuel trims. The PCM has adapted the fuel trims to the bad PCM to keep the car running and now with the new one the air/fuel tables are going to be off. Disconnecting the battery will reset this and the PCM will relearn the fuel trims.

EDIT: Here is the procedure that was in my 06 owners manual which should be similar to yours.:

Because your vehicle’s engine is electronically controlled by a computer,
some control conditions are maintained by power from the battery. When
the battery is disconnected or a new battery is installed, the engine must
relearn its idle and fuel trim strategy for optimum driveability and
performance. To begin this process:
1. With the vehicle at a complete stop, set the parking brake.
2. Put the gearshift lever in P (Park), turn off all accessories and start
the engine.
3. Run the engine until it reaches normal operating temperature.
4. Allow the engine to idle for at least one minute.
5. Turn the A/C on and allow the engine to idle for at least one minute.
6. Drive the vehicle to complete the relearning process.
• The vehicle may need to be driven to relearn the idle and fuel trim
• If you do not allow the engine to relearn its idle trim, the idle
quality of your vehicle may be adversely affected until the idle
trim is eventually relearned.

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Old 03-02-2012, 07:57 PM   #3
Vancouver, WA
1999 EX
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could be the best information on the forum.

We have a brand new IAC and it still wasn't working. Being smarter than the Chilton's manual, and not wanting to have to reprogram all the radio stations, I did NOT disconnect the battery, though the manual told me to.

Seems secondary, or like a "safety" precaution, but if that explanation were in the book, people wouldn't skip that step.

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