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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]
With OBD II standards, vehicle manufacturers were required to test the exhaust gas recirculation (EGR) valve for functionality during driving. Some manufacturers use the MAP sensor to accomplish this. In these vehicles, they have a MAF sensor for their primary load sensor. The MAP sensor is then used for rationality checks and to test the EGR ...
Another problem is that this section is 15 years (!) old now: I'm not too familiar with diesel engines in trucks, but in passenger cars: The problem that EGR transports soot back into the engine and therefore reduces its normal lifetime is a problem of high pressure EGR only. In contrast, low pressure EGR takes exhaust after the DPF.
The crankcase air outlet, where the PCV valve is located, is generally placed as far as possible from the crankcase breather. For example, the breather and outlet are frequently on opposite valve covers on a V engine, or on opposite ends of the valve cover on an inline engine. The PCV valve is often, but not always, placed at the valve cover ...
In addition to changing the fuel, US engineers have also come up with two other principles and distinct systems to all on-market products that meet the U.S. 2010 emissions criteria, [citation needed] [needs update] selective non-catalytic reduction (SNCR), and exhaust gas recirculation (EGR). Both are in the exhaust system of diesel engines ...
This has been made worse with the introduction of the exhaust gas recirculation (EGR) system on more modern cars. The oil vapors can mix with the re-circulated exhaust gasses and soot which then builds up on the intake manifold and valves etc. This layer over time hardens and thickens repeatedly.