2002 Kia Optima starts at times, then will not turn start at all. Battery good, fuel pump was replaced because of this problem, oxygen sensor was replaced because of this problem, and another sensor was replaced because of this problem. Had to leave the car at a church I visited in another town. Any suggestions...my mechanic says when hooked up to the machine that it has no bad readings and shown nothing wrong.
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I think this car has a special relay (fuel pump emergency shut off) under the hood that shuts off the fuel pump after a crash. Call the dealer and ask for a new one, it is a one time use and must be replaced.
Then you have a intermittent spark . Now do you have a spark tester to test spark. Its okay if you dont we have one . Oh by the way you did the fuel pump yourself. if you can do a fuel pump then you can do this to solve the no start problem. No spark tester? okay we will use that tachometer (RPM gauge). crank the engine does the tach meter reads zero at all times while cranking, if it does youll need a crank sensor. Here the story Rough running conditions and or stalling was caused by a faulty crank sensor, try shaking the connector or wiggle the crank connector then see if it starts. Youll need to inspect the connection for proper male to female connection these have been the most suspectable failure of KIA. If you decide to replace this sensor make sure connections are good, more than likely this was the problem and not the fuel pump
check make sure battery is 12.5 volts.if not battery is weak need replacing.have alternator checked out if battery is low.besure to turn off radio.to keep from losing radio playing code.if you need to replace battery.if battery is good.check for fuel pump operation.turn ignition on listen to see if fuel pump running.if no check fuse and relay.if both is good have car scanned for pcm trouble codes and faulty fuel pump code.if all is good.you could have faulty mass air flow sensor or bad ignition components.
well if spark quits fuel usaly will to computer will do this to stop cadilac converter from filling with fuel!and causeing a fire saftey feature!!!!okay disconect battery wait a couple of minutes reconect! turn key on postion do not start or crank!off then on until you hear a GRRRRunt that is your fuel pump that is what you should hear turn your head to the right towards back seet and once you hear it that means pump is good then crank it then spark should quit if the coil packs a r bad then you have your problem if so test for spark also if you have eng light on cut the case hook up obd 2 scan find the fault and fix THIS IS WHAT I WOULD DO CHEERS!