Mercury 9E5Z-9D475-A Valve - Exhaust Gas Recirculation

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Disconnect the cable from the negative battery terminal. Drain the cooling system. Remove the air intake duct. Disconnect the electrical connector from the EGR valve. On 2.3L engines, release the coolant hose clamp and disconnect the upper radiator hose from the coolant outlet passage. Release the clamp and disconnect the coolant hose from the EGR valve. Remove the two EGR valve mounting bolts and remove the EGR valve. Remove and discard the EGR valve gasket, then clean the gasket mating surfaces of the cylinder head and the EGR valve. Installation is the reverse of removal. Be sure to use a new EGR valve gasket, and tighten the EGR valve mounting bolts. Refill the coolant system. For 3.0L V6 models, disconnect the cable from the negative battery terminal. Disconnect the electrical connector from the EGR valve. Unscrew the tube nut fitting and disconnect the EGR pipe from the EGR valve. Remove the EGR valve mounting bolts and remove the EGR valve. Remove and discard the EGR valve gasket, then clean the gasket mating surfaces of the intake manifold and the EGR valve. Installation is the reverse of removal. Be sure to use a new EGR valve gasket, and tighten the EGR valve mounting nuts securely.

Exhaust gas recirculation (EGR) systems in late-model vehicles serve two key purposes, lowering oxides of nitrogen (NOx) emissions and preventing significant engine knock or detonation. Again, by injecting into the intake manifold a low proportion of the exhaust, combustion temperatures are reduced since exhaust contains gases which do not burn. These combustion temperatures are higher than 2500 F and result in high NOx formation; they, in conjunction with HC and sunlight, cause photochemical smog. EGR systems are generally claimed to run with minimal problems and the failures are reported to occur when the EGR valve is closed or fully open. There may not be visible sign of a closed valve but it may cause engine detonation or overheating whenever it is under load and on the other hand, an open valve may cause rough engine operation and stalling. In component replacement, the procedure include lifting of the vehicle and removing of some connecting part such as EGR pipe and the valve in addition, the identities of all old gasket and deposits before fitting. One has to be extremely careful whenever the EGR pipe is removed from the valve, and always ensure that the pipe is changed together with the threads with any sign of deterioration. After reassembly there is need to make sure that the PCM relearns for its idle as well as for the fuel trim strategy.

EGR systems reduce oxides of nitrogen (NOx) emissions and engine detonation (pinging) by recirculating a small amount of exhaust back to the intake system, which lowers combustion temperatures.