2001 Ford Expedition Question

Tiny
JVOIRIN
  • MEMBER
  • 2001 FORD EXPEDITION
  • V8
  • 2WD
  • AUTOMATIC
  • 195,000 MILES
On occasion, the engine will start a deep roaring sound usually when it is cold outside and last for about 5-10 seconds and then stop. I notice that when it does it, it puts a load on the engine. When it starts it will make my RPMs go up and then when it stops in drops my RPMs low like it is about to die and then ideals like normal. Soemone told me that it could be my power stearing pump going out on me but he didn't know for sure. Any ideas?
Monday, January 5th, 2009 AT 12:09 AM

5 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,176 POSTS
Hi:
A roaring sound usually indicates the clutch fan is engaged. However, that doesn't justify the idle. Does it happen when the defroster or AC is on?

Joe
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Friday, January 9th, 2009 AT 11:14 PM
Tiny
JVOIRIN
  • MEMBER
  • 3 POSTS
It probably only happens when the defroster (heater) is on. Never really paid attention to that, I just know it happens when it is cold outside and we probably do have the heater on when it happens.

When it does happen, it makes the RPMs go up and will try to make the truck roll faster at a stop. Then when the "roaring" stops, it will drop the RPMs low and then resume normal. I know its strange, I am no mechanic, but I usually can figure this kind of stuff out. I am stumped.
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Saturday, January 10th, 2009 AT 11:01 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,176 POSTS
The reason I asked about the defroster is because it turns the AC on when used. I was thinking the compressor was making the noise. Check to see if the noise comes on when the compressor kicks on. Also, that would justify the rpm drop. Check it and see if that makes sense.

Joe
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Saturday, January 10th, 2009 AT 2:05 PM
Tiny
JVOIRIN
  • MEMBER
  • 3 POSTS
Could it be the power steering pump?
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Sunday, January 11th, 2009 AT 12:02 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,176 POSTS
Hi:
Yes, the power steering pump can make a noise like you described. If you have a stethascope or a long piece of wood or anything that could transfer sound, carefully place it on each component and place your ear at the end. Make sure you are clear of the belts and pulleys. You don't want to have the tool fly and hit you. WHen doing this, the sound will transfer to your ear.

Let me know if this helps, and please be careful near the belts and pulley.

Joe
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Sunday, January 11th, 2009 AT 11:10 AM

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