Cold Start EGR A Flow Excessive Detected

Common symptoms

What you'll notice

• Check the EGR valve operation and clean or replace if necessary
• Inspect and clean the EGR passages and tubes
• Check for any vacuum leaks in the EGR system and repair as needed
• Verify proper operation of the EGR control solenoid and replace if faulty
• Check for any carbon buildup in the intake manifold and clean if necessary

Common causes

Most likely first

1. Clogged or dirty EGR valve
2. Faulty EGR temperature sensor
3. Malfunctioning EGR vacuum control solenoid
4. Leaking or disconnected EGR hose
5. Carbon build
6. up in the EGR system

How to diagnose & fix

Work through it in order

1. Engine misfire or rough idle upon starting the vehicle
2. Decreased fuel efficiency and increased fuel consumption
3. Engine hesitation or stumbling during acceleration
4. Check Engine Light (CEL) or Malfunction Indicator Lamp (MIL) illuminates on the dashboard
5. Unusual or excessive exhaust emissions, such as smoke or excessive smell