EGR (Exhaust Gas Recirculation) Valve & System

 

Does your engine knock when you accelarate hard or does the engine shake, sputter and maybe even stall when you come to a stop?  You may have and EGR system problem.  Trouble with the EGR system DOES NOT MEAN YOU NEED A NEW EGR VALVE!

 

 

 

 

 

 

 

The above are examples of EGR valves. 

 

As the name implies, the Exhaust Gas Recirculation System routes some of the exhaust gas back to the intake of the engine.  The small amount of exhaust gas lowers the peak temperature of the buring of the fuel inside the engine.  This dramtically reduces the generation of a major pollutant called Nitrous Oxides, simply burnt nitorgen.

 

EGR valves are either vacuum operated or electrically operated.  Either way, the Power train Control Module (the computer that runs the engine) uses information from various sensors to calculate the correct amount of EGR that is needed at the moment.  The valve is either opened by sending electricity to the valve or by applying a metered amount of vacuum to the valve.

 

The EGR system is a Goldielocks system.  Too much exhaust gas recirculation and the engine coughs, sputters and stalls.  Too little and the engine can knock, ping and otherwise carry on.  When knock or ping is detected by the Knock Sensor, the computer will retard the ignition timing, resulting in poor engine performance and poor gas mileage.

 

If you think your engine has a bad EGR valve or a malfunctioning EGR system, bring your vehicle to Clearview Tire & Auto Service for a correct diagnosis and professional guaranteed repairs which includes our Certified Auto Repair Nationwide Warranty.  We're in Hopkinsville, not far from Ft. Campbell and we've been here since 1952. Most repairs include one year FREE towing and roadside assistance, good 24/7 coast-to-coast.


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