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<h2>What is a coil spring on a car?</h2>Generally speaking, the suspension system of a vehicle is the combination of three parts: springs, shock absorbers, and linkages. These parts together connect the body of the vehicle with wheels, while allowing them to move relative to a certain degree.Nowadays, there are two mainstream options for springs in the suspension system: leaf springs and coil springs. The details of leaf springs and the comparison between leaf springs and coil springs will be introduced in our blogs. The leading role in this article is the coil spring.The coil spring in a vehicle looks similar to all the other springs we have seen in our life, but the coil spring for cars is manufactured to deal with a more challenging environment. A coil spring can help the vehicle to absorb and release the energy from the vertical movement of the wheels, and also provides a small amount of flexibility in the transverse direction. Through this, coil springs can filter out some unpleasant vibrations and increase the contact time between the wheels and the ground, providing a comfortable driving experience and improving the performance of the vehicles.Since coil springs play such an important role in the suspension system, it is crucial to make sure they are in good condition. Without a well-functioned coil spring, driving can become uncomfortable and even dangerous. There isn&rsquo;t a concrete rule that says how long a coil spring can last. Even though they don&rsquo;t usually break, they can still wear down over time, especially if the vehicle is often driven in a hazardous environment or bad roads. It is better to check your coil springs regularly to make sure they can support your car the way they should.<h2>Bad coil spring symptoms</h2><ul><li>Decrease in ride height: Coil springs are supposed to support your vehicle. If you notice your vehicle sagging, especially when the car is loaded, it is likely that there is something wrong with the coil spring.</li><li>Unusual tire wear: When the support from coil springs weakens, the balance of the vehicle can be impacted and the weight distribution on tires will be affected as well. As a result, some tires can wear down faster than others. What&rsquo;s more, the angle of the wheel can change and this will make the uneven tire wear worse.</li><li>Noise: One of the coil springs&rsquo; jobs is to filter out the noise under the suspension system. If you find the vibration and noise increase unusually when you are driving, this could be a sign of a malfunctioned coil spring.</li><li>Vehicle bounce: One obvious sign of bad a coil spring is unexpected bounces when your vehicle driving through speed bumps. When you drive your vehicle over a speed bump, the coil spring is supposed to prevent your car from jumping, at least at a slow speed. But with a faulty coil speed, conditions like speed bumps can cause uncomfortable bounces.</li><li>Jounce bumpers damage: If you see the jounce bumpers under your vehicle damaged, or if there is an impact mark on the suspension stop made by a jounce bumper, it could be a strong signal saying that you might need to check your coil spring.</li></ul>

Coil Spring

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Air Filter Box

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Air Flow Sensor

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Air Intake Duct

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Air Intake Hose

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Air Intake Manifold Actuator Control Solenoid

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Air Intake Manifold Flap Adjuster

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Air Intake Manifold Runner Control Sensor

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Electric Vacuum Pump

Engine Air Duct Assembly

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Engine Air Filter

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Intake Manifold

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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

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

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

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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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Glow Plug Relay Module

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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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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.

2004 Ford F-150 Coil Spring

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