Humming noise at idle in 4.6l ?

2001 FORD EXPEDITION
110 MILES
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MOEBSTER
  • MEMBER
  • 2 POSTS
happens from time to time engine fine but makes humming noise at idle iac valve seems clean could it be fan clutch ?
Mar 2, 2012 at 7:34 PM
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MERLIN2021
  • ✓ASE Certified Mechanic
  • 17,250 POSTS
  • ASE Certified Mechanic
Feel the iac during the hum. Iac's have been known to whistle and honk, so a hum isn't impossible.
Mar 2, 2012 at 8:05 PM
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