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Automotive

Seeing The Big Picture With AFR Sensors

Air/fuel ratio (AFR) sensors have become commonplace in today’s automobiles, taking over where traditional O2 sensors have left off.

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Automotive Video

VIDEO: Wide Or Narrow? What Is The Difference Between Oxygen Sensors And Wide-Band Air/Fuel Ratio Sensors?

In this video, Andrew Markel explores the difference between the two types of oxygen sensors and how the ECM sees the amount of oxygen left over after the combustion cycle. He also explains how new technology allows modern engines to see more of the fuel trim of the engine.

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Automotive

Fuel System Diagnostics Is All In The Fuel Trim Numbers

With lean-burn operating strategies being built into many of today’s gasoline direct-injection and gasoline compression ignition engines, it’s important to build a foundational knowledge of how fuel trims work in the real world.

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Automotive Featured

Modern Fuel Control Diagnostics: Sorting Through The Data Stream Maze

Adapted from Gary Gom’s article in ImportCar.   When confronted with a fuel control problem on a modern vehicle, I’ll normally use short- and long-term fuel trims to determine if the problem is caused by one of many failures, such as a vacuum leak or a leaking fuel pressure ­regulator. If you’re like me, you’ll […]

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News

Living Under the Hood: Sensing Something Awry

Once considered leading-edge technology, today’s oxygen sensor has become a commonplace service item on modern vehicles.

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Automotive

Not Sure That Air Filter Needs To Be Replaced? Check The Fuel Trim

The kicker with trying to diagnose whether an air filter is affecting performance is to see if the long-term or short-term fuel trims have changed.

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Automotive

Flex Fuel: Ethanol vs. Gasoline

For political and economic reasons, the use of ethanol gasoline in the U.S. has always been controversial.

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Automotive Featured

Hyundai Fuel System & Emissions Diagnostics

Take a look at the fuel ­injection system and driveability issues on Hyundai’s line of ­vehicles.