Manfacurer Control fuel air metering on 1995 Chevy blazer?

The 1995 Chevy Blazer's fuel-air metering isn't controlled by a single, simple component like a carburetor. Instead, it uses a sophisticated system managed by the Powertrain Control Module (PCM), also known as the Engine Control Unit (ECU). The PCM uses various sensors and actuators to precisely control the air-fuel mixture. These include:

* Mass Airflow Sensor (MAF): Measures the amount of air entering the engine. This is crucial for calculating the correct fuel injection.

* Throttle Position Sensor (TPS): Tells the PCM how far the throttle is open.

* Oxygen Sensor(s) (O2): Measures the amount of oxygen in the exhaust. This feedback allows the PCM to adjust the fuel mixture for optimal combustion and emissions.

* Fuel Injectors: These are electronically controlled by the PCM to deliver the precise amount of fuel determined by the sensor inputs.

* Manifold Absolute Pressure (MAP) Sensor (or sometimes Barometric Pressure Sensor): Measures the pressure in the intake manifold, indicating engine load.

* Crankshaft Position Sensor (CKP): This sensor determines engine speed and position, vital for precise fuel delivery timing.

* Temperature Sensors (Coolant Temperature Sensor, Intake Air Temperature Sensor): These provide crucial information for fuel mixture adjustments based on engine and air temperature.

In short, there's no single "fuel air metering" *component* to adjust or replace. Problems with the fuel-air mixture usually require diagnostic testing to pinpoint the faulty sensor, injector, or a problem with the PCM itself. A mechanic will use a scan tool to read diagnostic trouble codes (DTCs) from the PCM and then perform further tests based on those codes to determine the source of the issue.