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Spark Plug Wire
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When we are talking about automotive electrical system, how can we miss on the spark plugs. Spark Plugs, as the Wikipedia defines, are electrical device that fits into the cylinder head of some internal combustion engines and ignites compressed aerosol gasoline by means of an electric spark. Often, a little problem with the spark plug is the reason behind the breakdown of the vehicle in the middle of road. A little maintenance and few D-I-Y tips will help you keep these auto parts in place. But before that for repair, you need to know the common problems behind spark plugs. Lets together find out the common spark plug problems.

Problems With Your Spark Plug

• There are times, when your car's engine cranks, isn't it? but then, nothing happen after, i.e. it doesn't start after that. this is possible because of the spark plug.
• in some cases, the engine might run. after that, it often misfires. check for any worn out spark plug. in such a case, it is possible that these auto parts have either fouled or probably the reason is bad spark plug wires
• high or low voltage also indicate problem. on an oscilloscope, if you observe the firing pattern of each cylinder, you might be able to diagnose the problems yourself. if the firing voltage is noticed to be normal, it means there is excessive resistance in a plug wire. other possibilities can be loose plug wire, badly worn or too wide spark plug.
• in case you notice that there is a lower voltage in firing pattern, then it indicates, a damaged or shortened plug wire.
• fouling is something that should be avoided. One important cause of it is deposits of oil or fuel upon the plug electrodes.

Reasons Why You Need To Change the Spark Plugs

There are a number of factors that can be the cause for replacement of spark plugs. Some of them are:

• Fouling - In case you notice that there is a single fouled spark plug, you need to be cautious and get it replaced soon. Otherwise, you might have to suffer the loss of 25% of output of four cylinder engines.
• For Preventive Maintenance - This is always suggested as to avoid any major auto repair.
• Due to Worn Out Electrodes - That increases the distance between the electrodes and finally increases the firing voltage.

Fred has been in journalism for past eight years and over the years he has covered different news related to automotive industry. Cars, auto parts and anything related to this industry has fascinated him since childhood. He expresses his views and shares himself on his blog at: Automobile Hotspot

Replacing Spark Plugs Wires

The ignition process is fairly based on the proper working of the spark plugs. Spark plugs produces spark which the helps to ignite the fuel inside the engine. As the spark plug wire name suggests that these are the wires connected to the spark plug, which produces electrical spark. You need to have a look on these wires daily, because damage wires cause a lot of trouble.
Some suggestions are given below that how you can replace these wires without spending too much time.

The only thing you require to change the wires is new box of spark plug wires.

Steps

1.    Park a car on a level surface and apply Park brakes as well.
2.    Open the front hood. Look out for the spark plugs wires. These wires are usually found in black colors but they can be blue, black red or orange. The number of spark plug wires depends upon the number of cylinders your engine has. It means that wires and the cylinders correspond to each other.
3.    Take the box of new wires and open it. Look for the numbering (labels 1, 2, 3….) on wires. Lay them out in order of length, if wires are not labeled.
4.    Hold the bottom of the wire on one end and apply force outward or pull it back to yourself slightly until it pops off.
5.    Guided by the wire to its other end, it is attached to the distributor cap. Pull the wire from the distributor cap and remove it.
6.    After removing a wire from spark plug, have a look on plug for possible damages or presence contaminants on electrodes. If you find any damage, it is better to change the plug as well.
7.    Mostly the wires are attached with slots to avoid their connection with other wires or part of the engine. These slots are made of small plastic pieces which hold the wires firm against the connectors. To ensure longer life of new wires, be sure to put the wires back into the slots.
8.    Replace the old spark plug wire with the new wire of same length or label. The plug wire makes a clicking sound when it holds a spark plug.
9.    Repeat the same process for replacing all the rest of the wires. Always replace one wire at a time.

Things to Keep in Mind

-    In case if wires are permanently attached to distributor cap, you need to change both the cap and the wires at the same time.
-    The replacement of the wires depends upon the conditions of the wires. If you need to change only one wire, there is no need to change the other wires.
-    It is very important to deal with one wire at a time. Do not disconnect all the wires at once. They must be attached in the same order they pops off.

About the Author

You might also want to learn how to find your car's wiring diagram and also how to check Honda oxygen sensors

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what could be the reason for no spark on only one spark plug wire?

i have a 91 caprice with a lil over 200k and its a 5.0. Just last week it was running and now wont even start up. The ignition coil, distributor, and module are all good. what could it be? I replaced the bad wire with a good one but its still doing the same thing.

Swap the plug with one you are sure of and retest. If you get the same result, and the wire is definitely OK, then it is the connection from the distributor. If it DOES work OK then the gap may need setting on the plug or the plug may need replacing.

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This entry was posted on Thursday, July 2nd, 2009 at 6:47 am and is filed under Hammers Pullers Extractors. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.