Mechanics

MAP SENSOR

1992 Ford Explorer

Electrical problem
1992 Ford Explorer 6 cyl Four Wheel Drive Automatic

what are the problems cause by a map sensor failing
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Mays
December 22, 2009.




Hi there.

MAP SENSOR DRIVABILITY SYMPTOMS

Anything that interferes with the MAP sensor's ability to monitor the pressure differential may upset the fuel mixture and ignition timing. This includes a problem with the MAP sensor itself, grounds or opens in the sensor wiring circuit, and/or vacuum leaks in the intake manifold (airflow sensor systems) or hose that connects the sensor to the engine.

Typical drivability symptoms that may be MAP related include: * Surging.

* Rough idle.

* A rich fuel condition, which may cause spark plug fouling.

* Detonation due to too much spark advance and a lean fuel ratio.

* Loss of power and/or fuel economy due to retarded timing and an excessively rich fuel ratio.

A vacuum leak will reduce intake vacuum and cause the MAP sensor to indicate a higher than normal load on the engine. The computer will try to compensate by richening the fuel mixture and retarding timing -- which hurts fuel economy, performance and emissions.

Mark (mhpautos)

Mhpautos
Dec 22, 2009.


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