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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

Air Cleaner

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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

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

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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

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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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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.

2012 BMW 135i Coil Spring

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