Originally Posted by Coyote

Get it in the shop soon. This problem can lead to dangerous conditions
when you are pulling into traffic or making lane changes to get around
the slow moving idiot in the left lane on the highway.

BTW, the problem remains and the car was returned to the shop yesterday
morning. As it turns out, though I was told by the service manager that the EGR valve had been replaced, it had not. All that was done was to
reset the computer code.

One thing I did notice while driving on Monday, I was traveling down the
interstate highway, when I noticed a "bump", kinda like the tranny was
downshifting (which it had not). At that point, I noticed the problem with
the engine bogging down while trying to accelerate. A couple of miles
down the road, I felt another "bump", and the ability to accelerate quickly
was restored. Not too long after that, another "bump" and engine
bogging returned.

It seems to me that the programming for the actuator in the EGR system
is opening and closing the valve without regard to the current
temperature in the combustion chamber. Could this merely be a
programming bug? Or is the sensor gone flakey?

BTW, I've yet to experience this problem from a dead start, such as after
having stopped for a traffic light. The problem does return after a couple
of miles of driving, or very shortly after having gone through a quick
acceleration phase. Further, I now have a clue as to when the problem
is in force, as each problem phase or return to power is preceded by
a "bump" that feels like a one gear kickdown by the tranny.

BTW, does anyone else have the experience that it takes the service
department at their dealer at least three visits to fix any particular
issue? It seems like every problem I've had, few though they have been,
has taken 3 visits (leaving the car with them for multiple days each time)
to achieve problem resolution. Is this unusual or the norm?

Coyote