MAP Sensor

If ECM senses higher than normal manifold pressure (low vacuum) the system can go rich. Disconnecting the MAP sensor allows ECM to substitute a fixed value for the MAP sensor. If rich condition disappears, replace MAP sensor and continue testing.

If ECM senses higher than normal manifold pressure (low vacuum) the system can go rich. Disconnecting the MAP sensor allows ECM to substitute a fixed value for the MAP sensor. If rich condition disappears, replace MAP sensor and continue testing.