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Emissions

Several states now require regular (annual or biannual) emission tests. These tests have different names; the most common are Inspection/Maintenance (I/M), SMOG, or OBD-II emission testing. The tests may involve visual inspection of certain emission-control systems, measuring tailpipe emissions at specified engine speeds or as the vehicle runs on a dynamometer, or verifying the proper operation of the emission system on 1996 and newer vehicles with a scan tool. A poorly maintained emission system can cause the vehicle not to pass these tests.

With more than 100 years of experience in the automotive industry, you can trust that ACDelco understands emission-control requirements and emission-control parts.

  • Expanded line for most vehicles on the road today.
  • ACDelco continually incorporates technological advancements to help enhance the emission and fuel injection product lines. In some cases, this even results in improvements over Original Equipment.
  • Offers OBD-II Emissions and Drivability technician training, as well as correspondence courses, clinics, and parts professional training.
  • Emission and fuel injection parts are put through a variety of tests, often under extreme or unusual conditions, to help deliver the quality of parts you expect from ACDelco.

Just some of the functions of our Emissions parts are listed below.

Fuel Injectors

  • Spray fuel into the engine’s intake manifold or cylinders.

EGR Valves

  • Recirculate some of the engine’s exhaust gas back through the engine, which reduces the amount of nitrogen oxide (Nox) in the exhaust.

Oxygen Sensors

  • Detect oxygen content in the exhaust gases.
  • The Powertrain Control Module (PCM) uses this input to optimize the combustion process and control exhaust emissions.

Throttle Position Sensors

  • Electronically inform the PCM of the throttle valve angle.
  • The PCM uses this input to regulate the fuel and ignition systems.

Idle Air Control Valves

  • Control the amount of air that bypasses the throttle plate in order to regulate engine idle speed.

Manifold Absolute Pressure (MAP) Sensors

  • Read changes in the intake manifold air pressure, which indicates engine load.

Mass Air Flow Sensors

  • Measure amount of air entering the engine to determine the most efficient air/fuel mixture for achieving clean burns.

Carburetion Parts

  • Deliver fuel into the engine’s cylinders.

Secondary Air Injection Reaction (SAIR) System

  • Airflow, usually from an air pump, is directed into an engine system to reduce hydrocarbon exhaust emissions.
  • Includes pumps, diverter valves, pipes, tubes, and check valves.

Control Modules

  • Engine Control Module (ECM) controls engine functions and stores diagnostic trouble codes (DTCs) for engine components only.
  • Transmission Control Module (TCM) controls transmission functions and stores DTCs for transmissions only.
  • PCM controls powertrain functions and stores DTCs for engine and transmission.
  • Body Control Module (BCM) controls various body and accessory functions and stores DTCs.
  • Vehicle Control Module (VCM) controls engine, transmission, and some ABS (anti-lock brake system).