Join Date: Mar 2002
Location: Crestview, Florida
That is a bit of a mystery subject, but one way is by the computer taking an input from the knock sensor mounted on the intake manifold. If the computer senses any pinging, it will retard the timing. There are probably other factors, also, but I haven't been able to find them.
Currently an '86 CJ-7 and a '77 CJ-7 Golden Eagle---#4 and 5 following a '01 Sahara, '90 Sahara, and '85 CJ-7....