The #8 coil and spark plug are located on the drivers side rear of the engine. You will need a 7mm socket to remove the bolt that holds the coil down. After the bolt is out, pull the coil upwards and remove. Next you will need a 9/16" spark plug socket to remove the spark plug which is located in the hole that the coil came out of. The spark plugs in a 5.4L engine are sometimes frozen into the engine. If it is very hard to turn the plug, try spraying some WD-40 down the hole onto the plug and let it soak in for a while. Do not try to force the plug to turn, it will break and a special plug extractor will be needed to remove it.
Hope this helps you!
Number 8 is on drivers side last cylinder,
1 2 3 4
If this is where you are standing>
5 6 7 8<this is number 8
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Cylinder 8 is bank 2 (passenger side), furthest coil pack at the back.
Number 8 is the back cylinder on the passenger side.
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