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2003 ford explorer whining noise

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Jan 20, 2012, 12:53 AM

Post #1 of 2 (1794 views)
2003 ford explorer whining noise Sign In

2003 Ford Explorer 4.6L 140Kmiles

High pitched whining noise that just started and becomes louder and higher pitched as RPM increases.Starts as soon as the car is started and does not stop even after hours of driving. Sounds like it's coming from the front top of the engine. No difference if the trans is in neutral. No difference when wd-40 sprayed on belts. No difference when the steering wheel is turned from side to side while car is parked. No codes come up.

I've looked at other posts and these are the likely possible causes

1) worn idler arm pulley bearings - what would be an easy way to prove that this is the cause short of replacing the unit?

2)alternator worn bearings or bushings - what would be an easy way to prove that this is the cause without changing the alternator?

3) loose belt or frozen tensioner - I would think that this could be checked by just feeling the give on the belts. No loose belts felt. Also no change with spraying wd-40 makes this sound less likely. Agree?

4) worn belt - would expect wd-40 to make a big difference in the sound if the belt is slipping

5) power steering pump unit - what would be an easy way to prove this is the cause? There was no difference in the noise when moving the steering wheel. There has been no problem with the function of the unit and the fluid level is okay.

6)intake vacuum leak
7)engine bearing - these 2 I think I'll look at last if the others don't give a solution

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Jan 20, 2012, 5:04 AM

Post #2 of 2 (1758 views)
Re: 2003 ford explorer whining noise [In reply to] Sign In

Engine cool, take the belt off and just run it long enough to see if noise disappears. If so then spin the pulleys and feel for free-play in anything belt runs.

Good bearings are silent,

Long retired now

2003 ford explorer whining noise

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