Mitsubishi Repair: bew engine, piston rod, head gasket

Question
my fault is that the oil light came on then two weeks later i was driving and then i heard a clacking sound it got louder then i think i blew a head* then white smoke comes out and i try to make it home but two blocks later it got louder and my engine stalls? im thinkin did the clutch burn also?but it came from my engine ..also i tried the obd scan but it doesn't give me any codes it says 'pass'no code return why is that? how else can i find out wut broke and and would i be able to fix that with the repair manual if it wus a head or piston mostly with the top part of the engine? i would know the cost of haveing a mechanic fix it and trying to avoid it !!if possibble caould u say wut it wus it wus like a lose screw clattering ?

Answer
Angel,
You may have a broken piston rod.  But seeing the oil light come on, then a loud clacking noise and white smoke, that sounds like your engine was not receiving oil, overheated due to friction, broke a rod and blew the head gasket.  If that is what in fact happened, this is not an easy repair. Even with a repair manual, it would cost quite a bit of money and take LOTS of time if you do not have experience in engine rebuilds.  This would require upper and lower engine internal repairs.  If this really is the problem, it may be cheaper to simply buy a used engine as a replacement.
Good luck!