* Rough idle: The engine might shake or vibrate excessively at idle.
* Hesitation or stumbling: The truck may hesitate or stumble when accelerating.
* Reduced power: You might notice a significant loss of power or a lack of responsiveness.
* Check engine light: The check engine light will almost certainly illuminate, and a diagnostic code related to the EGR system will be stored.
* Increased emissions: Exhaust gases will contain more pollutants.
* Poor fuel economy: You might see a noticeable drop in fuel mileage.
The severity of the symptoms depends on how the EGR valve is failing. It might stick open, stick closed, or leak. Each scenario will cause different problems. A stuck-open EGR valve can lead to poor performance and rough running. A stuck-closed EGR valve can cause problems with combustion and emissions but may not always lead to immediately noticeable drivability issues, other than possibly a check engine light.
In short, a bad EGR valve is a likely suspect if your 5.7L Hemi is running poorly. Getting a diagnostic scan is highly recommended to pinpoint the exact problem.
