Rattling noise from hood of car. on 2006 Nissan Altima

While driving up hill I'm hearing a rattling noise coming from the hood of the car. There is no engine lights come on. What could it be?

by in Waipahu, HI on May 02, 2012
1 answer
ANSWER by , May 03, 2012
that could be what we call pinging from poss low octane fuel, try a higher grade gas