Originally Posted by Old Dog
Woops sorry. Must have had a senior's moment
. The link is now included where it should have been in the first place.
Thanks, Old Dog and AudiMick. The info helped greatly.
New question: On the floor of the black plastic air duct behind the throttle body is a 2-inch rubber "flapper valve" that allows recirculated gases to enter the intake manifold under positive pressure (my guess anyway). The mat is torn and non functioning so I removed it. Replacement of the entire duct piece with a new rubber valve is roughly $130. How important is this valve? Any harm if I operate without the piece in place?
Note to other ham-fisted DIY's: You will pay dearly for breaking the plastic hoses that lead into the air duct behind the throttle body, as I have done. They are quite brittle. Replacement cost is more than $120 for each hose!