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<h2><span style="font-size: 18px;">What does a spark plug do?</span></h2><p><span style="font-size: 14px;">A spark plug is like the ignition spark that gets your engine firing on all cylinders&mdash;literally. It&rsquo;s a small but vital part that plays a huge role in the engine&rsquo;s performance. When you start your car, the spark plug generates a spark that ignites the fuel and air mixture inside the engine&rsquo;s cylinders. This controlled explosion powers the engine&rsquo;s pistons, which then turn the crankshaft and keep the vehicle moving. Without the spark plug, the engine would fail to combust the fuel, and your car simply wouldn&rsquo;t start.</span></p><p><span style="font-size: 14px;">Not only does the spark plug create this spark, but it also helps keep the combustion process efficient. A properly working spark plug ensures smooth engine performance, better fuel efficiency, and lower emissions. Over time, spark plugs wear out and can affect everything from acceleration to engine misfires. So, while it&rsquo;s a small part, its job is crucial for your vehicle to run properly and efficiently.</span></p><h2><span style="font-size: 18px;">Symptoms of a bad spark plug</span></h2><p><span style="font-size: 14px;">Bad spark plugs can cause several noticeable symptoms in your vehicle. You might experience engine misfires, where the engine runs unevenly, jerks, or stalls. Poor acceleration is another sign, with your car feeling sluggish or slow to respond when you press the gas pedal. A rough idle, where the engine shakes or vibrates at a stop, is also common. If you notice your car is using more gas than usual, it could be due to decreased fuel efficiency caused by faulty spark plugs. Hard starting, where the engine takes longer to crank, and the Check Engine light coming on are also indicators. Lastly, you may see increased exhaust emissions, with a strong gasoline smell or black smoke coming from the tailpipe. If you notice any of these, it&rsquo;s a good idea to check and replace your spark plugs.</span></p><h2><span style="font-size: 18px;">Get the best spark plugs here at A-Premium</span></h2><p><span style="font-size: 14px;">Say goodbye to rough idling, engine misfires, or starting issues with the new spark plugs from A-Premium. Our spark plugs are compatible with virtually all makes and models across a wide range of heat ratings. Shop online now and enjoy free shipping and fast delivery.</span></p><p><span style="font-size: 14px;">At A-Premium, we make it simple to find the perfect parts for your vehicle. If you're asking, &ldquo;Which spark plugs do I need?&rdquo; just enter your car&rsquo;s year, make, model, and engine details at the top of this page, and we'll help you choose the right spark plugs. For example, if you need spark plugs for your Honda Civic, just enter its information, and we&rsquo;ll recommend the perfect fit.&nbsp;Shop now!</span></p>

Spark Plug

Air Cleaner

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Air Filter Box

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Mass Air Flow Sensors/Car MAF Sensors | A-Premium

Air Flow Sensor

Air Intake Duct

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Air Intake Hose

Air Intake Manifold Actuator Control Solenoid

Air Intake Manifold Flap Adjuster

Air Intake Manifold Runner Control Sensor

Air Intake Resonator

Electric Vacuum Pump

Engine Air Duct Assembly

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Engine Air Filter

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Intake Manifold

Intake Manifold Flap Actuator

Intake Manifold Repair Bracket

Intake Manifold Runner Control Valve

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Intercooler

Intercooler Hose

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Oxygen Sensor

Car Oxygen Sensor Price From $24.99 | A-Premium

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Pressure Sensor

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Supercharger Pulley Drive Unit

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Supercharger Snout Rebuild Kit

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Throttle Body

Throttle Cable

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Throttle Position Sensor

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Turbocharger

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Turbocharger Gasket Kit

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Turbocharger Oil Line

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Vacuum Pump

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Air Filters & Intake Systems

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Camshaft Adjuster

Camshaft Adjuster Cover

Camshaft Kit

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Camshaft Timing Gear

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Camshafts

Chain Tensioner Adjuster

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Cylinder Head

Cylinder Head Assembly

Eccentric Shaft Actuator

Engine Timing Belt

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Engine Valve Cover

Engine Valve Cover Gasket

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Harmonic Balancer

Rocker Arm

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Rocker Arm Shaft Lifter Assembly

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Timing Belt Kit

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Timing Chain Gear

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Timing Chain Kit

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Timing Cover

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Timing-Control Valve Solenoid

Valve Cover Gasket

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Valve Lifter Guides

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Valve Lifters Tappet

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Cams, Timing & Valvetrain

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Belt Tensioner

Coolant Level Sensor

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Crank Installer Tool

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Crankcase Breather Hose

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Crankcase Breather Valve

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Crankshaft Position Sensor

Crankshaft Pulley

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Engine Oil Dipstick

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Engine Oil Dipstick Tube

Engine Oil Filter

Engine Oil Pan Gasket

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Flywheel

Harmonic Balancer Crankshaft Hub

Knock Sensor

Oil Baffle

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Oil Cooler

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Oil Cooler Line

Oil Drip Pan

Oil Filler Cap

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Oil Filter

Oil Filter Base

Oil Filter Cover

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Oil Filter Housing

Oil Filter Housing Cover

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Oil Level Sensor

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Oil Pan

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Oil Pump

Oil Pump Drive Gear Shaft

Oil Pump Pickup Tube

Oil Separator

Serpentine Belt

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Cranks, Pistons, Oil & Components

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Camshaft Position Sensor

Camshaft Position Sensor & Magnet Kit

Connector Plug

Distributor Cap

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Electronic Ignition System

Engine Valve Covers & Ignition Coils Kits

Glow Plug

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Glow Plug Relay Module

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Ignition Coil

Ignition Coils & Spark Plugs & Wires Kits

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Ignition Coils & Spark Plugs Kits

Ignition Coils & Wires Kits

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Ignition Distributor

Ignition Lock Cylinder

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Ignition Starter Switch

Ignition Switch Actuator

Kill Switch

Knock Detonation Sensor

Relay

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Spark Plug Wire

Electronic Control Modules, Ignition & Distributors

Engine Wiring Harness

Intake Manifold Repair Kit

Pulley

Engine Components & Accessories

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Active Grille Shutter Actuator

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Auxiliary Water Pump

Drive Motor Inverter Cooler

Electric Engine Water Pump

Engine Coolant Air Bleeder Valve

Engine Coolant Pipe

Engine Coolant Shut Off Valve

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Expansion Tank

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Expansion Tank Mounting Plate

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Fan Pulley Bracket

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Fuel Cooler

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Overflow Hose Connector

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Radiator

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Radiator Control Fan Module

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Radiator Core Support Skid Bar Plate

Radiator Fan Cooling Motor

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Radiator Hose

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Radiator Support Assembly

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Engine Cooling

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The engine comprises many essential elements such as the lower cylinder block, upper cylinder head(s), and the cooling & lubricating systems. With A-Premium aftermarket engine components, you can expect that your engine deliver years of reliable performance. We offer a diverse selection of engine components from air filters and ignition coils (kits) to fuel pumps to cater to your needs.

2017 BMW 640i Spark Plug

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