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The Lucas EGR valve range includes more than 260 part numbers covering over 5000 applications for approximately 20 million vehicles. Once the system is cleaned and the new valve is fitted, technicians will need to reset the ECU to ensure the vehicle recognises the new component and that it operates correctly. Heavily contaminated systems would benefit from a more thorough clean using a Terraclean or similar system.” “Variable-geometry turbocharger systems should also be cleaned as carbon fouling here can also contaminate the EGR valve.

“We recommend using an EGR/Turbo cleaning aerosol to clean the combustion chambers and ducting to the EGR valve. In a statement, Lucas said: “The existing carbon deposits quickly recontaminate the valve causing premature failure. Lucas warn that this step is commonly overlooked and a clean EGR valve is put on to a dirty system. Replacing the EGR valveīefore replacing the EGR valve ensure that the system is cleaned. In both cases, the engine check or malfunction indicator light may switch on. Higher temperatures resulting from no recirculation will increase NOX emissions and may cause MOT failure. Loud detonations may be heard when a second ignition happens, this can cause serious engine damage. If the EGR is stuck in the closed position, fuel may ignite early as it reaches higher temperatures and a pinging or knocking may be heard from the engine at low RPM. Lower temperatures caused by continuous recirculation can increase emissions resulting in MOT failure. If the EGR is stuck in the open position, a continuous flow of exhaust gases will be sent back to the inlet manifold resulting in a rough idle when the engine is cold and stalling when the engine idles.įuel economy will decrease and you may notice an increased smell of fuel. The most common cause of EGR valve failure is carbon deposits that cause clogging or sticking, leaving the valve may stuck open or closed. The EGR valve helps keep temperatures below the NOX threshold by recirculating a small amount of exhaust gas back through the combustion process, diluting the incoming air/fuel mixture. NOX is produced when combustion temperatures exceed 2500☏ and nitrogen begins to react with oxygen. If the PCV valve gets stuck in a closed position. The cold temperature could cause a PCV valve to freeze and stick because of moisture drawn through the PCV system. The EGR valve reduces harmful nitrogen oxides (NOX) emissions from the exhaust. Exhaust Gas Recirculation works by recirculating a controlled portion of an engines exhaust fumes back through the engine. A PCV valve that flows too much air will lean the air/fuel mixture, while one that flows too little will richen the mixture and increase the risk of sludge buildup in the crankcase.