The total cost can also vary depending on the make and model of the vehicle, the brand of platinum or copper plugs used, your location, and whether you take the car to a dealership or an auto repair shop.

Labor cost: expect to pay $60-$140 as labor cost for a four-cylinder engine and $260-$320 for a six-cylinder engine.

Spark plug cost: a copper spark plug costs around $2-$10/piece, while premium iridium or platinum spark plug costs $20-$100.Replacing your vehicle’s spark plugs can cost around $100-$250 on the low-end and about $250-$500 on the high-end. How Much Does Spark Plug Replacement Cost? Here are answers to four common questions car owners ask about replacing a bad spark plug: 1. 4 FAQs About Replacing Faulty Spark Plugs Next, we’ll answer some FAQs related to replacing your car’s spark plug. While different causes can lead to the smell, the spark plug is a good starting point for diagnosis. As a result, you may notice that the car’s exhaust emissions smell like gasoline. If your spark plug isn’t burning the airfuel mixture properly, unburned fuel (or gasoline) will make it to the car’s exhaust system. However, the Check Engine Light can also activate if there are issues with your spark plug wire, coil pack, catalytic converter, etc. That usually happens when you’ve got a failing spark plug slathered in oil or running too hot, causing issues with the engine operation. Your car’s Check Engine Light may turn on when there’s a spark plug problem. If left unaddressed, engine knocking can cause irreversible damage to your car’s piston head, piston compression rings, cylinder head, cylinder head valves, and other critical engine components. Sometimes, you’ll hear a loud knocking sound coming from the engine.Įngine knocking results from the pressure shock waves created due to uneven burning of fuel in the combustion chamber. If your engine misfires, you’ll notice a sputtering sound coming from the car engine, violent shaking, or a sudden drop in engine power. It happens due to incomplete combustion of the air fuel mixture in the cylinder and can sap the engine power. Simply put, an engine misfire is when one or more cylinders in your engine don’t produce power. Engine MisfiresĪn engine misfire usually indicates that you’ve got a fouled spark plug. However, since a bad spark plug is the most common culprit for engine hesitation, start by troubleshooting your spark plugs. Slow acceleration can also result from a bad fuel pump or dirty fuel injector. Essentially, you’ll experience engine hesitation and feel like your car has lost its get-up-and-go ability. When you’ve got a malfunctioning or worn spark plug, you may notice that the car drives sluggishly or isn’t as responsive as before. Consequently, fuel economy drops as fuel consumption spikes, and you’ll have to fill up the gas tank more frequently. That’s because a faulty spark plug can’t burn the air fuel mixture coming into the combustion chamber efficiently. Poor Fuel EconomyĪ common symptom of bad spark plugs is a sudden drop in fuel economy (a.k.a. Rough engine idling can happen when your ECU (Electronic Control Unit) tries to compensate for a failing spark plug and loss of power. Specifically, you’ll hear rattling noises, feel excessive vibrations, and see abrupt surges/drops in the internal combustion engine’s RPM. Ideally, your engine sounds smooth and steady, and its RPM stays consistent.īut if you’ve got a bad spark plug, you’re likely to experience rough idling. As a result, your vehicle may crank for a long time before starting, or it may have a shaky start.Ĭontinued hard-starts can damage your engine’s ignition system and drain the car battery.

When you’ve got a worn spark plug, it can’t produce the spark needed to start the combustion process. If your vehicle struggles to start in cold weather or after sitting for a few hours, faulty spark plugs or bad spark plug wires may be the culprit.

Mini r53 bad spark plug symptoms