The Duramax engine is a large diesel engine used in full-sized pickup trucks. Just like standard gasoline engines, the Duramax engine has a gas recirculation valve. The EGR valve sends exhaust gas back into the combustion chamber. This decreases fuel consumption and helps to reduce the amount of pollution sent into the air by your vehicle. Over time, the valve will clog. When this happens, you must remove it so you can clean it or replace it.
Locate the metal tubing that connects to the driver's side exhaust manifold and extends upwards. This tube sends exhaust gas back to the EGR valve. Trace the tube upwards to locate the mounting location of the EGR valve. The location is dependent on the engine size. This is the easiest way to locate the EGR valve.
Loosen the nut that secures the tube to the EGR valve using an adjustable wrench. Pull the tube off the EGR valve.
Unplug the wiring harness that connects to the other side of the EGR valve.
Remove the bolts that secure the EGR valve to the engine. You need a Torx driver to remove the bolts.
Pull the EGR valve off the engine. The valve recesses into the engine so you may have to pull up hard on the valve to break it free of the engine.
