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ford "hum"

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Old Jun 11, 2007 | 02:07 AM
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ford "hum"

I've noticed especially on these 90's era Ford trucks they make a rather distinctive humming noise, especially when idiling, or turning slowley... Never really noticed if other trucks from this era make that noise or not... Anybody else know what I'm talking about? A friend of mine thought it was the power steering, just kinda curious as to what it is....
 
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Old Jun 11, 2007 | 03:07 AM
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Are you talking about the buzzing type noise? A noise similar to the noise the truck makes when you turn the key from the OFF to the ON position? If so, it is most like your fuel pump, they are very noisy on these trucks. The sound the truck makes when you turn the key to the ON position is the pump priming itself...

-Chris
 
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Old Jun 11, 2007 | 08:58 AM
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the sound is more like a howl from most ford power steering pumps.
 
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Old Jun 11, 2007 | 09:06 AM
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its possibly the idle pulley... ive noticed that sound myself mostly around 1000rpm... kind of a low hum like you described... thought i was low on power steering fluid so i added some until it was full (i was a little low) but i still got the noise... my dad put a stick near the altenator and the pulley to "feel" the sound and he felt it from the idle pulley..
 
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Old Jun 11, 2007 | 09:12 AM
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The sounds comes from the power steering pump, the reason is that most people don't know that Ford never spec'd power steering fluid for use in them. EVERY owners manual I've come across says to use either Type F trans fluid or Dexron III/Mercon trans fluid. If you drain the system completely and refill with mercon the noise will still be there but a LOT less noticeable.
 
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Old Jun 11, 2007 | 09:49 AM
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i have had good luck draining the pump and using lucas power steering fluid, makes it a lot quieter.
 
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Old Jun 11, 2007 | 10:36 AM
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Anyone mind doing a quick writeup on how to drain the power steering fluid?
 
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Old Jun 11, 2007 | 10:41 AM
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i had to replace both lines when i got the truck because they leaked.
 
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Old Jun 11, 2007 | 10:50 AM
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"Power Steering Fluid" is just ATF without the red dye.
 
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Old Jun 11, 2007 | 11:02 AM
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lucas is not just 'regular' power steering fluid, and it is actually red.
 
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Old Jun 11, 2007 | 06:48 PM
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Actually there is a very noticeable difference in viscosity between PS fluid and Trans fluid. There are actually more friction modifiers in trans fluid than in the PS fluid.
 
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Old Jun 11, 2007 | 07:13 PM
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Yah PS and ATF are not interchangable when mixed.

You can use one or the other when drained and filled with one.

I use ATF.
 
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