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<h2>What does an engine air filter do?</h2>
An engine air filter is an essential component in any vehicle. It helps to filter out dust, dirt, and other pollutants from the air that is drawn into the engine. This helps to keep the engine running properly, improving performance and efficiency. The air filter must be replaced at regular intervals, as a clogged or dirty filter can reduce engine performance, or even cause damage to the engine.
The air filter is typically located in the air intake, often located around the same area as the fuel filter. In some vehicles, the air filter is contained in a plastic box called the air cleaner, while in others, it is located directly in the <a href="https://a-premium.com/air-intake-hose">air intake</a>. It should be relatively easy to locate, as it will have a rubber hose leading to the engine.
An engine air filter is typically made of paper or foam and is designed to block dirt, dust, and other contaminants that can damage the engine. The filter should be replaced at the recommended intervals, which is usually every 10,000-15,000 miles (16,000-24,000 km). If the air filter becomes too clogged or dirty, it can reduce engine performance or even cause engine damage. If a vehicle is used for off-road driving or towing, the air filter should be checked more frequently, as the filter may become clogged more quickly than normal.
<h2>Dirty air filter symptoms</h2>
The engine air filter is located in the air intake system and helps to capture dust, dirt, and other contaminants before they enter the engine. If the engine air filter is dirty, airflow is restricted and the engine will suffer from a lack of air and fuel. You can usually see signs of a dirty engine air filter when you look at the filter itself. Dark, dingy, and grimy will generally indicate a dirty filter, the same as giving it a good squeeze. Foam filters will feel soft and spongy to the touch when dirty, and paper filters will look greyer and clogged up when dirty.
A more obvious sign of a dirty engine air filter is a warning light. This can come on when airflow is reduced and the air-fuel mix becomes incorrect. Reduced power, especially when accelerating and a misfiring engine are two other common signs of a dirty engine air filter. If the filter is extremely dirty, you may also experience a whistling sound from the air intake system as air is forced through the filter.
The best way to ensure your engine air filter remains clean is to have it checked regularly. Most manufacturers will recommend an air filter check every 15,000 miles or every year, whichever comes first. It&rsquo;s also important to check the filter more often if you drive in stop-and-start traffic or a dusty environment.
<h2>How to change an engine air filter?</h2>
Replacing an engine air filter is relatively straightforward and can often be done in a few minutes. Start by locating the air filter. It should be relatively easy to spot, as it will have a rubber hose leading to the engine. Once you have located the air filter, remove the cover or box and take out the old filter. Be sure to inspect the air filter for any signs of damage or wear, and if it appears to be cracked or torn, replace it with a new filter.
Once the old filter is removed, insert the new filter into the <a href="https://a-premium.com/air-filter-box">air filter box</a> or the air intake. Ensure that it is fitted properly and that it is securely held in place. Then, reinstall the cover or box, being careful to make sure that everything is tightened correctly. Finally, start the engine and check for any signs of engine performance problems, such as rough idling or poor acceleration.

Engine Air Filter

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Air Filter Box

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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

Electric Vacuum Pump

Engine Air Duct Assembly

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Intake Manifold

Intake Manifold Flap Actuator

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Intercooler

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Oxygen Sensor

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Pressure Sensor

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Throttle Body

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Throttle Position Sensor

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Turbocharger

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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 Cover

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Camshaft Timing Gear

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Camshafts

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Engine Valve Cover

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Harmonic Balancer

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Timing Belt Kit

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Timing Chain Kit

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Timing Cover

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Timing-Control Valve Solenoid

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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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Crankcase Breather Hose

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Crankcase Breather Valve

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Crankshaft Position Sensor

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Engine Oil Dipstick Tube

Engine Oil Filter

Engine Oil Pan Gasket

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Flywheel

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Oil Cooler

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Oil Cooler Line

Oil Filler Cap

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Oil Filter

Oil Filter Base

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Oil Filter Housing

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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

Cranks, Pistons, Oil & Components

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Camshaft Position Sensor

Camshaft Position Sensor & Magnet Kit

Connector Plug

Distributor Cap

Engine Valve Covers & Ignition Coils Kits

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Ignition Coil

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Ignition Coils & Spark Plugs Kits

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Ignition Distributor

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Ignition Starter Switch

Ignition Switch Actuator

Knock Detonation Sensor

Relay

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Spark Plug

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Spark Plug Wire

Electronic Control Modules, Ignition & Distributors

Engine Wiring Harness

Intake Manifold Repair Kit

Engine Components & Accessories

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Auxiliary Water Pump

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Expansion Tank

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Expansion Tank Mounting Plate

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Fuel Cooler

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Radiator

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Radiator Hose

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Radiator Support Assembly

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Temperature Sensor

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Turbo Hose

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Water Coolant Pipe

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Water Outlet

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Engine Cooling

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Engine Mount

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Engine Mounts

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Catalytic Converter

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EGR Valve

Emissions Fluid Pump

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Exhaust Fluid Heater

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Exhaust Gas Temperature Sensor

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Exhaust Manifold

Fuel Tank Breather Valve

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Fuel Vapor Leak Detection Pump

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Nitrogen Oxide Sensor

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Secondary Air Injection Check Valve

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Vapor Canister Vent Solenoid

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Exhaust & Emission Systems

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Fuel Filter

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Fuel Injection Control Module

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Fuel Injection Pressure Regulator

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Fuel Injector

Fuel Injector Kit

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Fuel Injector Module Wiring Harness

Fuel Line Kit

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Fuel Pump

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Fuel Sending Unit

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Fuel Tank Filler Neck Pipe

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Fuel Tank Strap

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High Pressure Fuel Pump

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Idle Air Control Valve

Mechanical Fuel Pump

Oil Pressure Relief Valve

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Fuel Systems & Components

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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.

BMW 640i Engine Air Filter