How To Check Your Spark Plugs & How Much It’ll Cost You

A properly functioning spark plug will take the electrical signal from the car battery to the ignition coil and create a spark to ignite the air/fuel mixture present in each cylinder.

Spark plugs don’t fail all that often, but when they do it will usually be because of one of these reasons:

Your Car: How To Check Your Spark Plugs

The spark plug is not gapped correctly, or has worn down over time, so there isn’t enough “jump” in the gap. This means that electricity is being discharged short of its intended destination.

How to Check Spark Plugs

The spark plug has been fouled by carbon deposits or oil. This can happen with an engine that burns oil, or if a vehicle has been driven hard and fast for extended periods at a time. The deposits on the plug prevent it from igniting properly.

The spark plug is simply old and worn out. Spark plugs are not designed to last forever and have a recommended replacement interval established by their manufacturer.

If you’re a do-it-yourself type, it’s important to know how to check spark plugs. This step-by-step guide can help you figure out what’s wrong with them and if they need to be replaced, or if there’s another issue that needs to be addressed.

To check the spark plugs in your car, you’ll need spark plug socket set and a shop light or flashlight. Spark plugs have different resistor ratings, so be sure the replacements are correct for your car.

1) Remove the Coil Pack

Most cars have coil packs that send power to the spark plugs. To get to the plugs, you’ll need to remove this part of the engine. Compare your car’s coil pack with pictures online to determine how to remove it. You may need to pop open a hood latch or remove a few bolts before you can pull off the coil pack. When in doubt, consult your owner’s manual before removing any engine parts.

2) Remove the Spark Plug Wires

Once you’ve removed the coil pack, you’ll be able to see the wires attached to each spark plug. Pop off these wires one at a time and then follow them down towards the spark plug they belong to so you know where each one goes when it’s time to put them back on. Then

Step : Look at the end of the spark plug.

Step : Inspect the electrode.

Step : Check for a rough idle.

Step : Look for uneven acceleration.

How Much Does it Cost To Replace Spark Plugs

The price of replacing spark plugs will depend on the make and model of your vehicle and the costs of parts and labor at the repair shop you visit. On average, plan on spending anywhere from $40 to $100 for each individual spark plug that needs to be replaced. This is assuming only one or two spark plugs will need to be replaced. The more that need to be replaced, the more you’ll have to pay.

An Introduction On Spark Plugs

Spark plugs are pretty simple devices that work in combination with other parts of the ignition system. The easiest way to think of them is as a sort of valve that controls the release of electricity into a combustion chamber so that a spark will ignite the air/fuel mixture and start the power stroke.

The first step in checking your spark plugs is to open the hood of the vehicle and locate the spark plugs.

If you aren’t sure where they are, refer to your owner’s manual. If you don’t have one, consult a repair guide at an auto parts store or public library.

Once you know where they are, check them to see how they look. They should be securely connected and not appear overly dirty or oily.

If they look oily, have a visual crack or some other anomaly, replace them with new ones.

If they look clean and well-connected, you will need to perform some additional tests.

Spark plugs are designed to last for about 100,000 miles in most vehicles. The size, shape and threading of each spark plug vary from vehicle to vehicle.

Car Mechanic

The best way to avoid car breakdowns is to give your car for periodic service and checks. Follow the car service and maintenance schedule suggested by the manufacturer. If you have bought a used car, then ask the seller about the maintenance history of the car. Follow for more...

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