Most vehicles have easy enough access where even a beginner can change their own plugs. Yes, spark plug replacement is often a do-it-yourself job. Most newer vehicles have a 100,000 to 120,000 mile change interval these days. Most vehicles don’t require frequent spark plug replacement and can last anywhere from 30,000 to 100,000 miles or more. While replacing the spark plugs has the potential to be a pricey project, there is good news. The price will largely depend on the make and model of the car, as certain cars require the best spark plugs available. So, all together (parts and labor), expect to pay anywhere from about $200 to $600 to have your spark plugs professionally replaced. The biggest factor in cost is the accessibility of the plugs and whether you’re going to a dealership or independent auto repair shop. For these engines, the labor costs can be substantially more. Some spark plugs are much harder to reach, such as transverse V6 engines and Subaru boxer engines. Most mechanics will charge approximately $150 in labor for vehicles with easily accessible spark plugs. Six-cylinder vehicles between $70 and $120 for parts while an 8-cylinder truck or car will run you about $80 to $150 in parts.
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It has been said that premium spark plugs may help fuel economy be sure to check with your mechanic if this upgrade would be appropriate for your car.įor a typical four-cylinder car, expect to pay around $30 to $70 in parts. Standard spark plugs made of nickel alloy are less expensive than premium spark plugs which are made of iridium or platinum. But, since the amount of plugs you need is dependent on how many cylinders your vehicle has, you will need to multiple that figure by 4, 6, 8, or even 10 in some cases. A single spark plug will usually cost in the range of $4 to $10 depending on the type of spark plug material. Spark plugs themselves are one of the most inexpensive components on a car. We recommend Parts Geek for the best prices and selection. This is in essence a condition called running rich which can be attributed to many things but again, starting diagnostics with something as simple as spark plugs is a good strategy. You will then notice a strong gasoline smell coming from your tailpipe. If bad spark plugs are not properly igniting the air/fuel mixture in the combustion chamber, unburned gasoline will make its way into the exhaust system. While sluggish acceleration can be due to a number of reasons, it’s always best to troubleshoot starting with the easiest things to check for, which would be inspecting spark plugs in this case. If your car does not respond like it used to when you step on the gas, worn out spark plugs may be to blame. Inspect each plug and replace as necessary. If you notice the RPM dropping or surging or the car vibrates too much, the car’s computer (ECU) may be trying to compensate for bad spark plugs. Your engine should purr like a kitten when it idles and stay at a consistent RPM. It may be possible to take out each spark plug and adjust the gap to correct specs but in most cases, new spark plugs are recommended. The reason for poor gas mileage is often that the gap between spark plug electrodes is either too close or too far apart when compared to factory settings. When spark plugs deteriorate, they lose their ability to burn fuel efficiently.
If your fuel economy is suffering, it could be as a result of the spark plugs going bad. In many cases, your check engine light will also turn on. If you notice intermittent sputtering or stumbling sounds from the engine, it may be due to faulty spark plug or some type of sensor malfunction. 2) Engine Misfiresīecause a bad spark plug can cause incomplete burning of fuel in the combustion chamber, engine misfires can be the result.
If your car cannot start at all, the battery may be the culprit. Keep in mind that spark plugs do not usually go bad all at the same time. Hard starting is often an indication your spark plugs are fouled up and need replacing. Since a strong spark from the plugs is necessary to start the engine, one of the most obvious indications of faulty spark plugs is that the car struggles to start. The 6 most common symptoms that your car’s spark plugs require replacement are as follows: 1) Hard to Start As you or your mechanic are diagnosing the cause of your car trouble, there are indications your spark plugs are deteriorating to look out for.
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