It's call Power Steering.
Could be steering rack is worn and needs replacement
Bad Battery. Bad Alternator. Lights left on by mistake. Something left running. Exc.
in steering cloum a silver plate wears out.
Check for codes... It maybe a bad coilpack. Or bad sparkplugs.
my 1999 did the same thing and I found out it was my transmission.
On a 1999 Ford Expedition : The fuse box is below and to the left of the steering wheel , by the brake pedal ( it has a cover on it ) Also , the Power Distribution Box ( which is " live " ) is located in the engine compartment near the brake fluid reservoir
The code scanner is reading a P1450 on my frod expedition? what would be the problem
I didn't find any sensors or switches related to the power steering, so I'd think the pump was bad.
A bad power steering pump, You need to either check the fluid level and make sure there is enough or have it replaced.
Clean the power steering are real good check for where the leak is coming from and go from there. For example if a hose is leaking replace hose, if power steering pump seals are leaking replace pump, exc.
where is located ford expedition 1999 relays
5 per wheel on the 1999 Ford Expedition
Expedition Journal - 1999 Into the Blue was released on: USA: 1999
Check the steering arms, the tie rod ends, and the ball joints for wear. Any of these will cause the problem.
For a short time, No. It will just make steering a little more difficult. It will probably never actually hurt the car but could eventually cause damage to the power steering pump on some cars.
According to the 1999 Ford Expedition owners manual : 4R70W ( which would have been used with the 4.6 liter V8 engine ) 4R100 ( which would have been used with the 5.4 liter V8 engine )
Expedition Journal - 1999 Dinosaur Killers was released on: USA: 1999
Expedition Journal - 1999 Wild Vision was released on: USA: 1999
Expedition Journal - 1999 Beauty of the Beasts was released on: USA: 1999
Expedition Journal - 1999 Eye of the Storm was released on: USA: 1999
Expedition Journal - 1999 Pictures from the Edge was released on: USA: 1999
Expedition Journal - 1999 Water Wars was released on: USA: 1999
Expedition Journal - 1999 Kiss of the Spider was released on: USA: 1999