Engine Hesitation | MAP(manifold absolute pressure) sensor | mileage + pickup + black smoke problem 

Map or manifold absolute pressure sensor is one of the most important sensor .The sensor provides instant manifold pressure information to the engine's electronic control unit. The data is used to calculate air density and determine the engine's air mass flow rate, which in turn determines the required fuel delivery for perfect combustion.
symptoms of a faulty MAP sensor?
*Poor Fuel Economy. If the ECM is reading low or no vacuum, it assumes the engine is at high load, so it dumps in more fuel and advances spark timing.
*Lack of Power.
*Failed Emissions Inspection.
*Rough Idle.
*Hard Starting.
*Hesitation or Stalling.
*Check Engine Light.
in this video i m show you MAP sensor problem due to improper ground which is provided by ECM .
#MAPSENSOR