Originally posted by FordBum:
Okay, I went ahead and pulled the upper intake off and found my P0401 problem, I think. The little channel where the egr gas goes back into the manifold was completely gunked up with carbon deposits. I went ahead and had the upper intake dunked to clean it all out.
How big (in diameter) is this EGR "channel" that you are talking about. I would like to clean it out by removing the throttle body, but I want to know what size pipe cleaner I will need.