5 Signs You Need to Change Your Spark Plugs

Spark Plugs

If you’re having trouble starting your car, a dead battery isn’t always the offending culprit. While a dead battery is common, faulty spark plugs can be the primary source of the issue. The spark plugs and the electrical components that power them make up the ignition system. At a predetermined time, spark plugs transmit electrical signals from the ignition coil. These electrical signals supply a spark that ignites the air and fuel mixture inside the combustion chamber. Spark plugs require routine service and maintenance every 30,000 to 50,000 miles. If the spark plugs aren’t working, the engine won’t either. Worn spark plugs will show a few noticeable symptoms when it’s time for them to be replaced. Below are five signs that your spark plugs need maintenance.  


The Check Engine Light Comes On. 

 If the check engine light is on, it’s best to have your vehicle inspected by an automotive specialist. The check engine light can illuminate for a variety of reasons. One important reason it can come on is due to the spark plugs misfiring. Misfiring spark plugs can cause the vehicle to increase exhaust emissions, idle roughly, and emit a varying amount of power when accelerating. 


The Engine Will Misfire. 

If the spark plugs can’t ignite a spark, the engine will not have enough power for a combustion reaction. The engine will misfire. If the engine misfires constantly, this is a sign that the spark plugs need to be replaced. 


Your Vehicle Gets Poor Gas Mileage. 

Bad spark plugs will not allow fuel to be used efficiently in the engine. Thus, forcing your engine to work hard and overcompensate for the lack of performance. 


Your Vehicle Will Have Difficulty Starting.

A vehicle consists of multiple components that work together to function properly. If the spark plugs have gone bad, they won’t adequately power the engine to start. The combustion response is delayed and not occurring when the key in the ignition is turned.


The Vehicle Will Be slow to Accelerate. 

When a spark plug is worn, it won’t become hot enough to provide a spark, the acceleration of a vehicle will drastically decrease. Your car may drive forward sluggishly no matter how hard you press the accelerator. 


Spark plugs are like brake pads; over time, they will eventually wear out. Staying on top of spark plug maintenance can improve performance and extend the life of the engine. In Walnut Creek, CA, Oakmont Auto Care has automotive experts available to inspect your spark plugs and replace them if needed. If you need an automotive diagnostic, click here to schedule an appointment or give us a call at 925-476-4881.