5586983 | Genuine Cummins® Exhaust Gas Recirculation Valve

• By recirculating a portion of exhaust gas back into the intake, the EGR valve lowers peak combustion temperatures, which significantly reduces NOx formation.

2. Improve Fuel Efficiency

• Helps the engine burn fuel more completely by moderating combustion temperatures and timing.

3. Reduce Engine Knock / Detonation

• By lowering combustion temperature, it prevents premature ignition in gasoline engines, protecting engine components.

4. Support Emission Compliance

• Ensures the vehicle meets environmental regulations for exhaust emissions.

5. Enhance Engine Longevity

• Reduces thermal stress on pistons, valves, and cylinder heads caused by extremely high combustion temperatures.

1. Rough Idle or Stalling

• Engine may shake, stall, or idle unevenly.

• Happens when the valve is stuck open, letting in too much exhaust gas.

2. Poor Acceleration / Loss of Power

• Slow throttle response

• Lack of power, especially when climbing or towing

• Caused by incorrect air–fuel mixture from a stuck open or closed EGR valve.

3. Increased Fuel Consumption

• Incorrect combustion leads to wasted fuel.

• Engine runs richer than normal.

4. Check Engine Light (CEL)

• Codes like P0400–P0409 (EGR system faults) may appear.

5. Engine Knocking / Ping

• Happens when the EGR valve is stuck closed, allowing combustion temperatures to rise too high.

6. Excessive Exhaust Smoke

• Black smoke: running rich from too much EGR flow

• White or grey smoke: incomplete combustion

7. Failed Emissions Test

• High NOx emissions when the valve is stuck closed.

• High hydrocarbons and carbon monoxide when stuck open.

8. Rough Starts or Hard Starting

• Engine struggles to start if the valve is stuck open, allowing exhaust gases in at the wrong time.