my ldv pilot van wont start?

my 2002 ldv pilot van turns over but wont start, i have used both keys black and red, there is no chip in the black key but one in the red. i am sure they were like this when i bought the van. there is no red flashing light anywhere and when i turn the ignition on its just normal lights, engine, battery and oil. i have got an oil leak side of engine drivers side front, could this be the reason for this. cheers