1. Engine Stalling: A dirty EGR valve can restrict the flow of exhaust gases back into the engine, causing the engine to stall or idle roughly.
2. Reduced Engine Performance: A dirty EGR valve can reduce engine performance and power output, especially at low speeds.
3. Poor Fuel Economy: A dirty EGR valve can lead to decreased fuel efficiency due to improper air and fuel mixture.
4. Increased Emissions: A dirty EGR valve can cause the engine to produce higher levels of emissions, such as nitrogen oxides and hydrocarbons.
5. Check Engine Light: In some cases, a dirty EGR valve may trigger the Check Engine Light (CEL) to illuminate on the dashboard.
6. Black Smoke: Excessive black smoke from the exhaust pipe can be a sign of a dirty EGR valve, indicating incomplete combustion.
7. Engine Surging: You may experience a sudden increase in the RPMs followed by a drop, sometimes referred to as engine surging.
If you suspect that the EGR valve on your 2004 Dodge 2500 5.9L diesel is dirty, it's recommended to have it inspected and cleaned or replaced by a qualified mechanic.
