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2. Exhaust gas recirculation - Wikipedia

   en.wikipedia.org/wiki/Exhaust_gas_recirculation

   EGR valve the top of box on top of the inlet manifold of a Saab H engine in a 1987 Saab 90. In internal combustion engines, exhaust gas recirculation (EGR) is a nitrogen oxide (NO x) emissions reduction technique used in petrol/gasoline, diesel engines and some hydrogen engines. [1]

3. MAP sensor - Wikipedia

   en.wikipedia.org/wiki/MAP_sensor

   The way they do this is during a deceleration of the vehicle when there is low absolute pressure in the intake manifold (i.e., a high vacuum present in the intake manifold relative to the outside air) the powertrain control module (PCM) will open the EGR valve and then monitor the MAP sensor's values. If the EGR is functioning properly, the ...

4. Mitsubishi MCA - Wikipedia

   en.wikipedia.org/wiki/Mitsubishi_MCA

   Emission reducing technology began with the installation of a positive crankcase ventilation (PCV) valve (MCA-I), followed by the addition of a thermo reactor air pump and catalytic converter in addition to an exhaust gas recirculation (EGR) valve (MCA-II) and a solenoid controlled automatic choke installed on the carburetor.

5. Ford Power Stroke engine - Wikipedia

   en.wikipedia.org/wiki/Ford_Power_Stroke_engine

   The 6.4 L also has a DPF and dual EGR coolers which are capable of reducing exhaust gas temps by up to 1,000 degrees before they reach the EGR valve and mix with the intake charge. The DPF traps soot and particulates from the exhaust and virtually eliminates the black smoke that most diesel engines expel upon acceleration. The engine computer ...

6. Wastegate - Wikipedia

   en.wikipedia.org/wiki/Wastegate

   An internal wastegate is a built-in bypass valve and passage within the turbocharger housing which allows excess exhaust pressure to bypass the turbine into the downstream exhaust. Control of the internal wastegate valve by a pressure signal from the intake manifold is identical to that of an external wastegate.

7. Engine braking - Wikipedia

   en.wikipedia.org/wiki/Engine_braking

   Exhaust gas recirculator (EGR) valve redirects exhaust gas back into the engine intake, often through a restricted/narrow pipe. Diesel particulate filter (DPF) is designed to capture soot particles that would otherwise be released into the atmosphere; it greatly obstructs exhaust flow and can sap almost as much power as a small air conditioning ...