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You can fabricate a tester from a 6 inch long mongol pencil. Sharpen one end and drill a 1/8" hole in the middle. Now remove the sparkplug wire from each sparkplug and insert the pencil onto the sparkplug wire with the dsharpened end connected or touching the ground or any metal part of the engine. Start your engine and you should see sparks jumping on the drilled hole on the pencil which indicates that your spark plug wire is okay.
Well you need a Rachet set with a spark plug socket for your Car. Then place the socket on the spark plug after removing the wire and turn counter clockwise to remove it. Counter clockwise is turning left if looking at a clock. Be sure not to break the spark plug wires when removing them. You must hold them tightly at the end and pull them off slowly and carefully. Once you have the spark plug end of the wire off,, put it aside but remember which spark plug it goes too. It's very important not to mix them up.
When putting your new spark plugs in be sure to set the gap correctly or buy a set of spark plugs with preset gaps. Then place the new plug into the hole and turn them clockwise to tighten by hand at first them with your sparkplug socket and rachet until the new sparkplug is snug. Not to tight. Just snug as it will tighten a bit more on it's own. Then replace the spark plug wire carefully.
Those are as easy as they come these days.
Mark each spark plug wire with a piece of tape with the cylinder # written on it, so as not to mix up the wires.
Remove each spark plug wire by firmly grasping the wire by the boot (do not pull on the wire) and twist it back and forth a few times while pulling slowly. It should pop off without a great deal of effort. If it is seized and it breaks, you will have to replace the wire, or at the very least replace the terminals (if you can get some).
Use an air hose and blow around the base of each spark plug to dislodge any loose dirt that could fall into the cylinders (not absolutely necessary, but a good idea).
Remove each spark plug with a spark plug socket and extension and ratchet (I forget which size socket, it's either 5/8 or 13/16).
Check the gaps of each new spark plug (typically around 0.035 in).
re-install each new spark plug by hand (do not cross-thread them) and once you have ensured that the plug is threaded in properly, tighten the plug until it seats, and then tighten an additional 1/16 of a turn. Repeat this for the remaining plugs.
Re-install wires to the corresponding spark plugs.
You are finding out why they recommend replacing the plug wires along with plugs. These 'wires' actually have no wire at all--just carbon-soaked-cotton-string covered by a heavy man-made rubber-like covering and metal adapters on each end. The clips on the ends are made to hook onto the respective parts so that they don't just fall off. They usually work well until physically disturbed.They do make a small tool that facilitates removal of the plug ends, but still recommend changing the wires. Hope this helps!
Starting on the pasenger side. Remove the intake tube running from the air filter box to the throttle body and disconnect enough tubes to swing it out of the way. The sparkplugs are down below the small coils you see at the end of the sparkplug wires. With a 10mm socket remove bolt holding the coil, disconnect the plug at the top of the coil by squeezing it at the top and pulling straight off the coils.
Pull the coil straight up. there will be about a 6 inch tube that connects to the top of the spark plug when inserted. You will need a 5/8 sparkplug socket and about 2 feet of extensions to make it easy on yourself. Insert the spark plug socket and extensions down the hole you removed the coils with the tube from and remove and replace the sparkplug. Reinstall your coil onto the engine and move to the next one until you have replaced all the plugs on the passenger side.
Make sure you reconnect all the plugs to the coils, hoses to the intake tube and reinstall your intake tube. The drivers side is a little easier. Pop the spark plug wires from their plastic holders to free enough slack to be able to pull your sparkplug wires out of the block. For the plug closest to the front of the engine you will need to remove the 10mm bolt holding the ground wires to the intake manifold to be able to free enough space for removing the plug.
For the middle plug you will need to remove the 10mm bolt holding the bracket that is holding one of the throttle cables at the top of the intake manifold. For the rear plug just pop the flexible hose that runs behind the black metal bracket straight up out of its clip and push it out of the way along with any other hoses that run through this area. Pull the spark plug wire from its place by pulling straight up just like with the coils. there will also be about a 6 inch tube running down to the spark plug at the bottom of these plugs.
Remove and replace the plugs same as before. make sure you reconnect all your hoses and wires to their previous locations. Doublecheck to make sure you reconnect all the ground wires/ brackets. Also you will need to use " twin ground electrode plugs" (see sticker on front of your plastic timing belt cover? to the right of the radiator hose).
The coils will need to be removed first, then take compressed air and blow out the spark plug tubes, then you can replace the spark plugs. Use only Motorcraft Platinum Spark Plugs. Unless you know what you are doing, I would recommend a repair shop.