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How to replace a car spark plug

Spark plugs are an important part of a gasoline car engine. Without them, the engine will not start, and if it is in a rough condition, the engine will not work properly. largely For gasoline cars Spark plug, Whether you drive or not New Porsche 911 Or the 1990s Toyota Corolla Station Wagon. Most engines use one plug per cylinder, so the V6 usually has six, but some cars require two per cylinder.

The frequency with which spark plugs need to be replaced depends on a variety of factors, including the type of vehicle you are driving, how you drive, and the mileage. Signs of bad spark plugs include engines that are difficult to start, misfire, or poorly idle. Working on this task yourself may seem daunting, but it’s a lot easier than you might think. A spark plug is a bolt that emits electricity. Roll up your sleeves and get started.

what is necessary

  1. New spark plug
  2. Spark plug wrench
  3. Gap tool or feeler gauge
  4. Wrench (optional)
  5. Masking tape (optional)

1. Find the spark plug

First, you need to find a spark plug. They are bolted to the cylinder head near or above the engine, but they can be hidden under the plastic cover and need to be removed. On older cars, you can find them by following the wires from the distributor — one comes from the coil, the other goes directly to the plug. Many new cars without a distributor have a coil on each plug that needs to be removed.

To illustrate this process, I’m using a 1972 mini-project car. In the photo below, the spark plug is below the top of each blue wire. This guide is by no means mini-specific and also applies to: motorcycle, Lawn mowers, chainsaws, etc.

2. Remove the old plug

Spark plugs are bolts in nature and are easy to remove. Left-handed, right-handed. Start by disconnecting the spark plug wire or coil. Removing the wire is easy. Gently pull it to remove it. Do not touch the end towards the distributor (unless necessary to ensure additional clearance). It is recommended to label each wire with masking tape to get it back in the correct order. If you are dealing with coils, they may be bolted to different sizes for each model. Either way, you should see the plug immediately. Before removing them, remove any debris that has accumulated in the spark plug wells. Otherwise, it may fall into the engine.

Once you have access to the plug and the wells are clean, the spark plug wrench will come out. There are several types. Some mechanics prefer to use a socket that can be attached to the ratchet, while others prefer to use a dedicated wrench. You can use anything as long as it reaches the plug in the right size. Keep in mind that using a regular socket can damage the spark plug.

3. Gap the new spark plug

Some spark plugs have a pre-gap, while others do not need to have a gap. If you fall into any of these categories, you can skip this step, but it’s a good idea to make sure that the gaps for the units with gaps are set correctly in advance. If you do not check either box, you will need to use a feeler gauge (or feeler gauge) to adjust the space between the ground and the center electrode. It is usually 0.02 to 0.06 inches, but it depends on the car. “Close enough” doesn’t work here. If the gap is not set properly, the engine may slow down or stop working at all, so check online or in the service manual as needed. Alternatively, the gap is usually clearly marked on the box containing the new spark plug.

Suppose you are working with a gap of 0.04. If the gauge does not fit between the electrodes, the gap is too narrow. Slowly bend and unfold the ground electrode. If the gauge fits but neither electrode is touched, the gap is too wide. Slowly bend and tighten the ground electrode.

4. Install a new spark plug

Install new spark plugs in the reverse order they were removed. First, lightly tighten (if possible by hand), use a wrench to tighten by hand, and then secure in about 1/8 turn. Even better, use a torque wrench to check the specifications in your car’s service manual or online. Do not overtighten the spark plugs. It can cause damage that disables the engine (and is surprisingly expensive).

Put the wire or coil back into the plug and start the engine to make sure it works properly. Now you are ready.

What should I do with old spark plugs?

Favorite: You can throw it in the nearest trash can, store it as a souvenir, or weld it to a stickman. Anyway, be sure to look before discarding the electrodes. The electrodes tell us a lot about the shape of the engine. The electrodes appear to be worn (usually brown or gray). This is unavoidable, but if the electrodes are coated, a dry black substance could make the engine too rich — too much petrol. If you see a damp, heavy black substance, engine oil may enter the combustion chamber (blue smoke may come out of the exhaust vents). If they are coated with a white substance, the engine is probably too lean.

How to replace a car spark plug

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