How to change spark plugs?

Do anyone know how to change out spark plugs for a 99 ford expedition. it has a v8 in it. And how many spark plugs are in it. if you know, where is the locations of them, need to know that to.How to change spark plugs?
It has 8 plugs.

Change the easy ones from the top under hood area.

Then the rest you can probably reach from the wheel well area.

If you are a non-mechanic I would recommend taking it to a garage, if you don't know what you are doing you could do more harm than good.How to change spark plugs?
Well you don't tell us which engine you have.

Both have only 8 plugs.

And on both engines they are in the same area, between the valve cover and the intake manifold.



Diffence is:

On the 4.6liter engines there are sparkplug wires going to each sparkplug.

On the 5.4 liter each sparkplug has it's own coil. You have to remove a small nut holding this inplace. By twisting back and forth losen the coil and pull straight up and off the plug.



On both engines use a compressed air to blow out any debris and dirt that is sitting down in the plug socket before removing the sparkplug.
I can get you part of the way there. Unless you have an airplane engine, there is one spark plug per cylinder...so there are 8 plugs. Find 8 fairly thick wires that seem to disappear over the side of the engine - four on each side. These are probably the spark plug wires. They lead you right to the plugs. Chances are, you won't be able to see the spark plugs, which is a bad sign if you are making your first attempt. An expedition has platinum plugs, which need to be changed at 100,000 miles.



If you are unsure where the plugs are, or how many a V-8 takes, I would not recommend doing this yourself. There is just too much crap in the way in newer vehicles.
okay, you described your vehicle as a V-8 this tells you it has 8 plugs. If it were a 6 cylinder (V-6), you are talking 6 plugs. You cannot miss the location of the plugs, however, under the hood of your car you will see plug wires, follow the wires to the valve cover (top mount). You will need to set the gap on your plugs (see operators, owners manual for gap). You do need a plug gapper (these cost about $1.49), you also need a timing light ($49.99 and up). A tuneup by an auto shop your looking at in the neighborhood of $150-250.00 (plug wires and plugs-you can buy premium wires and premium plugs -most expensive or standard - less expensive). Labor should be 1 1/2 hours at most. My suggestion is that you get it professionally done. Not a task to take on by yourself , if you are asking questions about how many plugs you have? Where located at. Please don't take this personally but some things are best left to the professionals.
shovel is exactly right. make sure you blow the holes out before you pull the plugs. if you don't it will cause problems with blowing the boots out. it is most definitely a job.