[ctwatson86]

i have a 93 mustang its an lx, it is a 4 banger and its a making a noise, a pinging noise in the combustion chamber and when it does this ping it smokes heavy sometimes white smoke and sometimes black.but it only pings when i lay ing to the gas real good when i take off. it has 124 thousand miles on it i have done a tune up to it.please if anybody knows what i can do to fix this or what is causing it please let me know. Thanks