L/X 2.3 rattles

When climbing hills I hear what sounds like pre-ignition .This is with 87 octane and also tried some 89 but same problem.Anyone know what the symptoms of a bad timing belt are on these engines as I am new to FORDS.When the temp gauge is at the beginning of the normal area what deg is it at?I've heard close to 200 deg???:runaround:

When climbing hills I hear what sounds like pre-ignition .This is with 87 octane and also tried some 89 but same problem.Anyone know what the symptoms of a bad timing belt are on these engines as I am new to FORDS.When the temp gauge is at the beginning of the normal area what deg is it at?I've heard close to 200 deg???:runaround:
It was Pre-Ignition! Tried some 93 and has new found power and no rattling at all.