to start off, New to the forums. i have been searching the forums for the problem i am haveing and couldnt find it. i cant be the only one with the motor problem. on my wifes escape xlt 3.0 duratech, the engine has detonation when accelorating and really bad when climbing a hill. this truck has been babied its whole 104,00 mile life and has never been beat on or for that fact never drove over 75-80 mph. i have always used motorcraft syn blend and change the oil every 2000-3000 mile . all other fluids have been flushed on schedule. i live in new england Ct. and weather can be bitter cold to very hot. noticed this problem more on hot days. if anyone has any solution to this problem, i thank you in advance.