The drawback of an egr system in a diesel is it causes hotter intake air and bad carbon buildup in the intake manifold tract and intake valves due to the mixture of exhaust and oily pcv gasses. NOX is formed at combustion temps above 2500F, but this only happens for a split second and will be dramatically cooled by the time it exits into the exhaust manifold. Custom tuning can bring everything back into proper function with an egr delete, and a using an SCT X3 type tuner with a custom heavy tow tune will make the truck run very well.Ī functional egr system on a diesel is designed to help lower peak combustion temps in the cylinders to help control the formation of nitrogen oxide gasses(NOX). This is because a functional egr system is designed to work with the turbo and fuel program mapping with stock tuning. When you delete the egr cooler, and still use factory programming, the truck will actually lose some power and be in a mild detuned state.
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