need help ,,detonation [sp]?

[89llx]

I need help making a check list, I have an 89 stang with HCI and vortech [10 psi], I have had the car at 2 diff tuners, and they both said the car wanted to detonate much to early, they said the AIR FUEL WAS FINE, but they did not know why it had the problem, so I have replaced many things but before I go back up I would like to have help to make shure I have it covered, I have swaped out the computer , replaced plugs- wires- dizzy and cap, rebuilt motor, new rings bearings, checked the cam deg, anyone know of anything else? also the new [old] computer A9L how do i tell if its a 5speed compt or auto??

thanks

 

[jrichker]

The A9L is a 5 speed computer, the A9P is an automatic computer.

The A9P supposedly has more spark advance which is good for a N/A engine but not necessarily good for one with forced induction.