How to Clean a Diesel EGR Valve

by James Melzer

The ERG valve helps exhaust gasses flow through a diesel engine. When the ERG gets clogged with carbon build-up, it will cause problems with the engine such as loss of power, smoking, or surging. Once it is removed, however, cleaning the ERG valve on a diesel engine is an easy process. The process takes a few minutes to complete, and the valve can then be reinstalled to maintain the quality of the engine's performance.


Scrape the carbon build-up off of the ERG valve with a small flat-head screwdriver and a stiff nylon brush.


Remove the two O-rings and base gasket on the ERG valve with an O-ring removal tool.


Soak the ERG valve in carburetor cleaner. Do not allow fluid to penetrate the weep valves located beside the base gasket. Submerge it until the remaining carbon is removed.


Rinse the ERG valve with injection fluid after the carbon build up has been removed.


Dry the ERG valve with a clean cloth or compressed air. Replace the gasket and O-rings. The size of these depends on the size of your ERG valve.

Items you will need

About the Author

James Melzer began writing professionally in 2008. He is a novelist and freelance writer from Toronto, Canada. His feature writing has appeared on Digigasms and his journalistic work has appeared on Robodustrial. Melzer holds a degree in radio broadcasting from Loyalist College.

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  • photo_camera the powerful engine image by kuhar from