Your Nissan Pathfinder is probably showing the ignition timing off 20
degrees because the timing belt has jumped off one notch but the ignition
distributor has been corrected far enough to allow your trucks engine to run
efficiently; this is one scenario, probably the only scenario unless your
looking at a notch which is not the actual timing mark but rather a deep
scratch on the crankshaft pulley.
posted by SmogTips Support