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Spark Plug Terminal
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Years ago, spark plugs became fouled much more quickly than they do today. It was common to need replacements after driving little more than 10,000 to 15,000 miles. Part of the problem back then was that automotive fuel contained lead. Today, with lead all but removed from fuel, spark plugs can last 40,000 miles or more. Some are even advertised to last 100,000 miles (though this is optimistic).

Because the plugs represent a critical part of your engine's operation (without spark, there can be no combustion), it's important to change them when they show signs of wear. Neglecting to do so will result in declining performance. Below, we'll take you through the process of removing and inspecting them.

Gathering Your Tools And Locating The Plugs

In addition to a set of replacement spark plugs, you'll need access to a socket wrench, spark plug socket, and a few socket extensions. You should also plan to wear safety goggles to protect your eyes from debris.

Lift the hood of your vehicle, and look for wires along the top of your engine. They are made of rubber, and each is connected to a cylinder. If your vehicle's engine has four cylinders, you'll be able to see four wires. A 6-cylinder engine will have six wires, and so on. Once you have located them, you're ready to remove the plugs.

Removing The Plug Wires

A lot of people doing this for the first time are tempted to removed all of the wires simultaneously. It seems simpler to do so. The problem is, the plugs in your engine's cylinders fire in a particular order. If, while replacing them, you inadvertently mix the wires and cylinders in the wrong order, your engine's performance may suffer. To avoid that problem, replace them one at a time.

Grasp the first plug wire snugly, twist it, and pull. It should come off easily, leaving the plug sticking out of the engine block. You'll see the plug's terminal (the topmost part) and part of the insulator exposed. The next step is to remove the plug.

Removing The Spark Plugs

You'll need your socket to remove the spark plug from its housing in the block. Slip the socket over the plug (using an appropriate extension), and make sure the fit is snug. Then, attach the ratchet. Gain some leverage and turn it gently counter-clockwise. Apply a little pressure if the plug seems stuck.

Once you have removed the first spark plug, inspect its condition closely. It will provide clues regarding your engine's operation.

Checking The Condition Of The Plugs

There are several indicators that suggest possible problems. For example, look at the side and center electrodes (located on the opposite end of the terminal). Has black soot accumulated on the tips? If so, you're observing carbon deposits, which suggest the air-fuel mixture in the cylinder is running rich.

Do you see deposits on the electrodes that appear black and wet? If so, you're seeing oil. This can mean a few things, but the most common is that oil is leaking past one or both of the valves (intake or exhaust) into the cylinder.

Sometimes, the center electrode will melt. This is more serious than oil leaks or a too-rich air-fuel mixture. A melted electrode might imply your engine is running too hot. It can also mean other things, but it is important to identify the cause to prevent expensive damage from occurring to the assembly.

Another item to note is the gap between the side and center electrodes. The spark that ignites the air-fuel mixture in the cylinder must be able to jump the gap. Over tens of thousands of miles and millions of sparks, the center electrode erodes. As it does, the gap widens. If you notice significant erosion, it's time to change the plugs.

Fouled, melted, or eroded spark plugs will eventually lead to engine performance problems. If your engine is behaving strangely, check the plugs and replace them, if necessary.

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How to Check Your Spark Plugs

A spark plug is a device which uses electric sparks to function. It is fitted on the head of cylinders found in engines and is used to ignite aerosol gasoline that has been compressed through the creation of sparks. It has a center electrode that is insulated and has been joined by use of a wire which is also insulated to the ignition coil on the outside or a magneto circuit thereby forming a spark gap in the cylinder through the use of a grounded terminal that can be found beneath the plug. Spark plugs are required to be replaced when at least 20000 miles have been covered, usually when the car has been scheduled for routine maintenance. They should be checked every 10, 000 miles or annually. It is important to note that a spark plug not functioning properly will affect the status of the car significantly as they could lead to the car not starting. Therefore, it is very important that they are checked regularly and are properly maintained even as one routinely maintains the other parts of the car.

When one is looking to inspect the spark plugs in the car, to check for their viability some steps should be followed. Firstly, one will need to locate the lever which is situated underneath the dash board and pull on it so as to release the hood. The second step is to walk to the car’s front, reach beneath the hood, hold the latch and give it a squeeze to unlock the hood then locate your spark plug. They are usually in a row along on one engine side and are connected to some wires which are very thick. Alternatively in other engines such as the V- shaped ones, the plugs are usually located on either side. One is strongly advised to change these plugs one by one and to always return its wire before changing another one. The procedure involves first of all pulling off a single such wire at the point where it is connected with the plug. At the side of the wire where the plug is located, there is some form of rubber. This is the part that the spark plug should be pulled from. If one pulls a bit higher than that then they risk damaging the wire as it can separate from the junction.

After a spark plug has been pulled, one should first of all remove the dirt and any unwanted material that may be surrounding the plug. This is in order to avoid debris falling in your cylinder when the plug has been disengaged. The plug is removed by turning in an anticlockwise manner using the spark plug socket and ratchet. If the plugs can not be easily accessed, one will need a ratchet extension. It is advisable to use one with a head that is flexible. After this, one can now check the plug to see if it needs to be replaced. A spark plug that is still in good condition should have a light coating of some deposits that are grayish brown in color.

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I have yellow spark from coil wire to ground. Did chiltons tests and coil checks fine. what next?

Chevy 5.7L TPI. External coil. Chiltons 3 step coil test checks fine. Additionally, all terminals on coil checking at 8500 ohms. Car runs but misses at idle and gets terrible fuel mileage. Tried swapping coils with no difference. Yellow spark from coil wire to intake manifold using a spark plug in the distributor end of the coil wire.
I'm checking directly from the coil wire, bypassing the distributor altogether.
No, the check engine light is not on.

Moisture inside the distributor cap.

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This entry was posted on Monday, May 5th, 2008 at 10:37 am and is filed under Screwdrivers And Pliers. 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.