Your exhaust may also smell like gas if you’ve got a clogged air filter, a leaky fuel injector, or a defective mass airflow sensor.īut troubleshooting your spark plugs is a good starting point. Consequently, your vehicle’s tailpipe emissions will start to smell like gasoline. Unburnt gasoline will reach the vehicle’s exhaust system when your spark plugs don’t ignite the air/fuel mixture properly in the combustion chamber. In other words, it’ll feel like your vehicle has lost its ability to get up and go. You step on the accelerator pedal, but your vehicle isn’t as responsive as it used to be and accelerates sluggishly. Engine Hesitates During AccelerationĪnother common symptom indicative of worn spark plugs is engine hesitation. However, if your car won’t start, the problem could be also lie with your car battery. And the engine likely stalls when you try to turn on the ignition system. Old and worn spark plugs will struggle to create this spark and power up your engine. Your spark plugs provide the spark needed to ignite the air/fuel mixture in the combustion chamber. These are signs that your vehicle’s ECU (Electronic Control Unit) is struggling to compensate for the loss of power due to bad spark plugs. Under normal conditions, your engine will sound steady and smooth.īut if your vehicle has a faulty spark plug, you’ll hear pining, rattling, or knock-like noises coming from the engine. fuel economy or gas mileage) by around 30%.Īs a result, you’ll have to make more frequent trips to the gas station and shell more money on gasoline. In fact, spark plug failure can reduce your car’s fuel efficiency (a.k.a. Reduced Fuel Efficiencyīad spark plugs increase your vehicle’s fuel consumption because they can’t efficiently burn the airfuel mixture going into your engine. You may encounter signs of mechanical damage or fuel fouling (spark plugs getting flooded with fuel). Since faulty spark plugs are a common cause of Check Engine light activation, it doesn’t hurt to start by diagnosing your spark plug. It can also light up due to spark plug wire or coil pack issues. However, a faulty spark plug isn’t the only reason why your Check Engine light illuminates. Check Engine Light Turns OnĪ worn spark plug can cause your Check Engine Light to turn on or keep flashing. If your car has faulty spark plugs, you’ll notice some of these symptoms: 1. What Are The Common Symptoms Of Failing Spark Plugs?
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