you can pull the codes by cycling the key off on three times
on and leave it in the on position without ever hitting the start position.
Watch the check engine light
it will flash something like this
flash pause flash long pause flash pause flash pause flash
This would be code 23. Do an online search for codes or post on the TJ forum for some help.
'84 CJ-7 Junkyard TBI 360/T18/D300, 4" 4WDH Lift, D44 front with ARB and HS/D44 Rear w/ Detroit, 4.56s, 36" Iroks, TFI, TJ flares, Homemade rocker guards and bumpers with swing out, Optima Yellow Top, M8000, York OBA, 6pt cage
"when you're up to your *** in alligators, it is hard to remember that your original intention is to drain the swamp"