While many aspects of the 6.6-liter Duramax diesel are highly praised, many owners have experienced trouble with the fuel pump and EGR system. These issues have occurred across the GMC Sierra, and ...

SERVICE TIPS: DURAMAX EGR VALVE/DPF Two critical elements that need to be checked out at 100,000 miles are the EGR valve and the DPF. Hasten says to run a computerized flow test on the DPF filter ...

Gasoline EGR valves are very similar to high-pressure ones. The vacuum created by cylinder depression draws the exhaust gases in, and the flow is regulated by the opening and closing of the EGR valve.

EGR metering valves tend to take a lot of abuse from being constantly exposed to the exhaust stream.

Some 6.6-liter Duramax turbodiesel owners have even considered an EGR delete, effectively removing the valve and components that can clog.