Symptoms of Bad Spark Plugs

What Do Spark Plugs Do?

First, let’s take a closer look at the responsibilities of spark plugs and how they help your engine run.

Fortunately, there actually isn’t too much to unpack here. As their name might suggest, spark plugs serve as a spark of electricity for the engine. They provide the bolt of electricity needed to ignite the air-fuel mixture within your car’s engine.

As a result, the pistons get the energy they need to effectively power the engine and start your car. So, as you can see, spark plugs are an instrumental part of your vehicle’s engine and its ability to run properly.

What Are the Symptoms of Bad Spark Plugs?

Since they’re such an important part of your car’s engine, it’s important to know when the spark plugs may be failing or malfunctioning. Now, let’s check out some of the telling signs that your vehicle’s spark plugs aren’t optimally performing.

Engine Misfires

You’ve likely experienced a time when you climb into the driver’s seat, turn the key in the ignition, and the engine misfires and fails to start. These misfires can come from a variety of different sources within the engine, but it may simply mean the spark plugs aren’t doing their job.

Struggling To Accelerate

Spark plugs provide that necessary jolt of electricity that brings the engine to life. So, when the materials that create that spark wear out, it can severely alter the engine’s functionality, such as its ability to accelerate your vehicle forward.

If you notice the gas pedal isn’t responding and creating proper acceleration, it may be a sign that the spark plugs are worn. In that case, you should avoid driving and have your vehicle serviced as soon as possible.

Idling Engine

Normally, the engine doesn’t create much noise beyond the smooth hum of your vehicle. If you start to notice that the engine is making a strange noise when idling, such as a knocking or rattling, it may mean the spark plugs are malfunctioning.

Decreased Fuel Economy

When the spark plugs are on the fritz, it can mean they aren’t producing the energy needed to properly burn fuel. This can lead to a significant drop in your vehicle’s standard fuel economy.

So, if you start to notice your vehicle is burning through fuel more rapidly, it may be time to have your spark plugs checked.

Hard Starts & Check Engine Light

Finally, if your vehicle is simply struggling to start, it may mean there’s an issue with the spark plugs. If you can finally get the engine to start but notice our vehicle’s check engine light is on, then you should seek out service as soon as possible. It may all be a result of the spark plugs reaching the end of their lifespan.

Where Can I Replace Bad Spark Plugs?

If you notice any of these signs behind the wheel of your Toyota, our team is here to help. At our Toyota service center, spark plug replacements are a regular occurrence, and our team of factory-trained technicians is equipped to get the job done.

Our service team members are Toyota certified and equipped to provide your ride the necessary services it needs, no matter its body style or model.

When it’s time for a checkup of your vehicle’s engine and spark plugs, fill out our online form to schedule a service appointment!