what is the little knob with a brass center on the throttle body of a 2004 mercury mountaineer
I changed out my intake manifold on my Mountaineer. I was proud that I had no extra pieces. However, when I went to start her up she went straight into Engine Failsafe Mode. Upon further investigation, I found there was a piece broken off of the throttle body. I googled it and it is a hexagon looking bolt/knob with a brass center. What is it? Could this be what sent it to failsafe mode? can I buy just this one piece or the whole throttle body? thanks in advance for any help!