![]() Check Engine Light. Depending on the age of your vehicle, MAP sensor diagnostic trouble codes (DTC) may range from simple circuit, or sensor faults, to correlation, or range faults.Hesitation or Stalling. When starting from a stop or trying a passing maneuver, stepping on the gas might not give you any joy, especially if the ECM is giving you a lean mixture based on faulty MAP sensor readings.If you can only start the engine when your foot is on the accelerator, you probably have a MAP sensor problem. Hard Starting. Similarly, an excessively rich or lean mix makes the engine hard to start.Insufficient fuel injection starves the engine for fuel, leading to rough idling and perhaps even random cylinder misfiring. ![]() Excessive fuel generates higher hydrocarbon (HC) and carbon monoxide (CO) emissions, while insufficient fuel may lead to higher nitrogen oxide (NO x) emissions. ![]()
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