1984-1996 Corvette EGR Diagnosis

 

By Chris Petris

Exhaust Gas Recirculation (EGR) came about in 1975 when catalytic converters were introduced. The inert exhaust gas was used to quell the increased heat in the engine‚Äôs cylinders from the lean fuel mixtures required to keep the catalytic converters from melting down. EGR systems also helped eliminate spark knock from the increased combustion chamber temperatures. The feds were also pushing for a reduction of NOx nitrogen oxide emissions to reduce ground level ozone formation. The EGR system was an asset in many ways during the early years of emission control. As engine controls and development advanced, EGR has become obsolete for the majority of engine manufacturers. Unfortunately, there are many Corvettes on the road with EGR systems failing. (more…)

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