i have a 2001 mustang gt that if the vehicle is cold no pinging noise what so ever,but when the motor gets hot or warm ,when u shift into first about 1500/ 2000rpm is when u hear the pinging and this goes on in every gear that u can hear until the motor noise is to loud to hear it it sounds like a little machine gun not real loud ping but loud enough to be aggrevating.u can also flutter the gas in between that rpm range when hot and u can make it do it but not constant because its not under a load please help with any info!!!!NONE of the local ford dealerships have a clue!!!!car only has 43,000 miles on it