so i got the excursion back this weekend. and its so hot here in tri citys washington that it started right up when i was testing it. the FICM tested 49.7volts KOEO to 49.4 cranking and both batteries load tested good, just replaced this last winter. every time i tried starting it, it fired right up. so still stumped. any ideas? my cousin said that in seattle when its cold in the morning its a bear to get started sometimes?
It has the SCT tuner with custom tunes from MkmCustoms in it for the egr delete light and he had it on economy tune. could it be the tuner? long shot?