Results Of Incorrect Operation
With too much EGR flow at idle, cruise, or cold operation, any of the
following conditions may occur:
| • | The engine stops after a cold start. |
| • | The engine stops at idle after deceleration. |
| • | The vehicle surges during cruise. |
| • | The vehicle idles roughly. |
If the EGR valve stays open all of the time, the engine may not idle.
A DTC P0401 may set. Refer to
DTC P0401 Exhaust Gas Recirculation (EGR) Flow Insufficient
.
Too little or no EGR flow allows the combustion temperatures to get
too high during acceleration and load conditions. This could cause the following
conditions:
| • | Spark knock (detonation) |
