Noise

Tiny
JEAN LEE
  • MEMBER
  • 2001 FORD EXPEDITION
  • V8
  • AWD
  • AUTOMATIC
What makes my 2001 expedition make bumps and grinding sounds when driving at low speed and quits at higher speed and some times it doesn't do it at all
Monday, July 18th, 2011 AT 2:20 PM

1 Reply

Tiny
THE FORD MAN
  • MECHANIC
  • 38 POSTS
I see that the vehicle that your vehicle is an all-wheel-drive. This is a system that will engage the 4x4 automatically. The most critical issue facing this system is that all tires MUST be the exact same diameter. Tire combinations that have different diameters feed the computer tiny variations in speed. The computer detects it as slippage, so it needlessly engages the 4x4.
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Monday, July 18th, 2011 AT 3:42 PM

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