What Makes a Car Sputter?

Mechanical and electrical problems can make a car sputter.

Your vehicle's motor is made up of a number of electrical and mechanical systems that may cause the car to sputter. If you know the basic mechanics of your motor, you can quickly troubleshoot a malfunctioning motor.

Description

You can detect vehicle sputtering from the distinct sound and feeling that emanates from the car. The exhaust will emit a rapid "pop" noise that sounds like bursts of air coming through a pipe when the vehicle sputters. When you accelerate or drive steadily, the vehicle will feel as if it is momentarily losing power.

Causes

A malfunctioning battery will not provide adequate power to your vehicle's ignition system when the motor is idling, causing significant sputter. Your engine will also sputter if the amount of gas in your gas tank is not sufficient to power the vehicle. Spark plugs that fail to fire will cause your engine to run erratically and sputter under normal driving.

Prevention/Solution

Typically, spark plugs are replaced every 60,000 miles, though you may need to replace yours if they foul and no longer work. Test your battery with a voltmeter to ensure that it is providing the necessary "cranking amps" to power your vehicle. Keep at least a quarter-tank of fuel in your vehicle whenever possible, and use the next highest octane fuel rating to test if your engine operates better.

References

• Car Pros: Engine Sputter Problems