In the automotive world, spark plus are considered consumables. Most user manuals recommend in the maintenance service area to replace spark plugs about every 30.000 miles. This number can vary a bit depending on each make and model.

Why You Should Not Replace Spark Plugs At Home

Replacing spark plugs is not that complicated. All you have to do is to remove the ignition coils and then unscrew the spark plugs placed beneath them. You need a special kind of wrench and socket to remove the spark plugs. They can be purchased from most auto parts sellers but doing it at home involves some risks.

Because the spark plugs are screwed deep inside the engine block, they are subject to heating and cooling cycles that make them and the socket expands and retract. Over time, they can become stuck inside the block. Trying to unscrew them to replace the plugs may cause severe problems if the spark plugs break. It can happen even to expert mechanics. The spark plug can become stuck and break into half. When that happens, removing it can be very difficult and requires special tools that only a repair shop would have.

Signs of Bad Spark Plugs

You should always replace spark plugs as per the recommended service interval. The maintenance service manual should tell you exactly when to replace them. If you do not follow the guidelines, you may experience problems with the engine. When a spark plug fails, the engine misfires. That cylinder that has the failing spark plug will not fire, causing your engine to lose power and run very rough. It will vibrate more than usual and acceleration will feel as if the car is struggling.

Keep note that if you even see the check engine light, it may be caused by a bad spark plug or ignition coil. Replacing the plugs is inexpensive. The parts and labor are cheap and there is no reason not to do it. Just remember that the mechanic working on your car may not know when your plugs were last replaced. You need to keep track of when you replaced your spark plugs.