Q:

How do you detect a bad MAP sensor?

A:

Quick Answer

Vehicles with a bad manifold absolute pressure (MAP) sensor typically run rough while accelerating, decelerating or idling. Other common symptoms include increased fuel consumption and sudden jerks or hesitation while accelerating. Drivers may detect a strong smell of gas after the engine has warmed up.

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Full Answer

A MAP sensor works together with the electronic control unit, or ECU, in cars that are equipped with fuel injection systems. The MAP sensor helps the ECU calculate the amount of fuel needed for efficient consumption by monitoring the engine's mass airflow rate. MAP sensors are not critical components however, and cars with bad MAP sensors will still run, albeit with less efficiency and greater fuel consumption. Ignoring a faulty MAP sensor can lead to other engine problems, so it still should be checked if a problem is suspected.

To check for a faulty MAP sensor, a complete engine diagnostic will need to be performed. Replacing a MAP sensor requires some technical skill. However, not all faults will call for a sensor replacement. Sometimes, symptoms linked with a MAP sensor may be caused by something less severe, such as a hole in the hose attached to the intake manifold. Having a car inspected by a professional is the surest way of diagnosing the problem and preventing the fault from worsening.

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Related Questions

  • Q:

    Where is your car's manifold absolute pressure sensor located?

    A:

    A manifold absolute pressure sensor is located on the intake manifold of a vehicle's engine. Inside the MAP sensor is a resistor that moves in relation to the intake manifold pressure.

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  • Q:

    What are some tips for troubleshooting the GM manifold absolute pressure sensor?

    A:

    Troubleshooting the General Motors manifold absolute pressure or MAP sensor can be done accurately with the use of a mutlimeter and a vacuum pump. Symptoms of a MAP sensor problem that require troubleshooting include specific codes displayed on the instrument panel's check engine light, hard starts, black smoke from the tailpipes, rough idling, lack of engine power and deteriorating gas mileage.

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  • Q:

    What are some Chevy check engine codes?

    A:

    Some manufacturer specific Chevy check engine codes are P0342 camshaft position sensor A bank 1 low input, P1105 secondary vacuum sensor circuit, P1106 MAP sensor circuit intermittent high voltage, P1107 MAP sensor circuit intermittent low voltage, P1108 BARO to MAP sensor circuit comparison too high, P1109 secondary port throttle system, P1111 intake air temperature sensor circuit intermittent high voltage, P1112 intake air temperature sensor circuit intermittent low voltage and P1113 intake resonance switchover valve circuit. Other Chevy check engine codes are P1170 bank to bank fuel trim offset, P1171 fuel system lean during acceleration, P1185 engine oil temperature circuit, P1186 EOT circuit performance, P1187 EOT sensor circuit low voltage and P1188 EOT sensor circuit high voltage, according to Engine Light Help.

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  • Q:

    What is the purpose of MAP math testing?

    A:

    MAP (Measures of Academic Progress) testing provides a personal assessment of progress in elementary-level mathematics on a student-by-student basis, as the Northwest Evaluation Association explains on its website. This assessment helps teachers tailor lesson plans to the individual needs of students.

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