MAP Archives - Import Car
VIDEO: How Do MAP and MAF Sensors Interpret Vacuum Leaks?

Andrew Markel goes under the hood to explain the different ways that mass airflow sensors and manifold air pressure sensors look at vacuum leaks. Sponsored by Intermotor.

Speed Density Systems: Performance Reliability

For many years, most of us believed that the mass airflow system provided the most ­accurate measurement of an engine’s intake airflow. For one thing, not too many things can go wrong with a system that produces a single voltage or frequency input that indicates to the ECM an exact value of intake ­airflow in grams per second.

modern engine speed density test