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Air Filters and Fuel Trims

Modern engines rely on precise airflow and oxygen sensor data for optimal performance.

Understanding Fuel Trims

The fuel trims are what govern what’s going on inside the engine. This video is sponsored by Auto Value and Bumper to Bumper.

Fuel Trims

To gain a better perspective on fuel trims, think about how “analog” vehicles dealt with changing fuel and air mixtures.

ASE Test Prep: Fuel Trims and Filters (VIDEO)

Here are four conditions where the air filter can influence the short-term and long-term fuel trims. Sponsored by FRAM.

Long-Term Fuel Trims and Filters (VIDEO)

Long-term fuel filters need to be watched and maintained. This video is sponsored by Auto Value & Bumper To Bumper.

Fuel Trims!

Understanding fuel trims is the gateway to diagnosing common emissions problems. However, before we begin to use this information, specific criteria must be met in order for the PCM to gather accurate information.

Fuel Pumps and Cranking

Diagnosing the problem comes down to understanding what causes a loss of fuel pressure.

GDI Fuel Pumps and Diagnostic Margins (VIDEO)

A small change can have implications for emissions and drivability. This video is sponsored by Carter Fuel Systems.

Drivability Issues Fuel Trim Diagnostics

No code diagnostics are some of the most challenging drivability issues.

Checking Your Fuel (Video)

Fuel systems can have many possible issues to diagnose. This video is sponsored by AP Emissions.