exhaust gas recirculation, they say to unhook it so if the egr cooler starts leaking it wont hyrdolock your engine, but i wouldn't recommend doin it, just buy an egr delete
The EGR (exhaust gas recirculation) recirculates exhaust gas into the intake manifold for emission reasons. Unplugging the EGR valve will not allow exhaust gas to enter the intake manifold, although exhaust gas will still enter the EGR cooler (cools the exhaust gas entering the intake manifold)which is prone to failure. On your 2004 it may or may not set a CEL. But like what has been said, just buy an EGR delete and be done with it. Also most custom SCT tunes have the EGR valve turned off (will not open).
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