engine knock

could the vent on the hood if it comes lose and hit the motor wile i drive could it create engine knock, just asking i really dont understand this engine knock stuff so bare with me still learning about this thing.

No,  knock is prob not what you think
 
Here you go get a reading.   and this will I hope clear up to you why this can blow your motor
http://www.mitsubishiforum.com/m_42371/tm.htm

cool thanks