Be sure to clean the battery terminals and make sure that the battery is tested to be holding a good charge.If the voltage from the battery is the slightest bit weak then the fuel and or ignition relays will release while the starter moter takes the most amperage to turn the engine over,causing a no start condition.
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It sounds like a bad crank sensor or a cam sensor,regardless your first step before throwing anymore parts into it is to have it scanned.This will a least narrow the problem down to a specific area.
Ask for a print out of the scan. good luck
Until you learn how to read a wiring diagram & can logically figure out exactly the only thing that could cause such a problem,you can't even start any on vehicle examination or testing to correct things
You need to replace the relay or the ignition switch,check for power to the relay in the crank position,[pin 85 or 86] in the plug the relay was taken out of to see if the power to the relay goes away as soon as it is in the run position.If so replace the relay,if not,replace the ignition switch[not the key switch the switch the key switch turns].
Sounds like it could be the starter again. Most aftermarket starters, and alternators too, are rebuilt, and sometimes you get a bad one. You can check the other obvious stuff, battery cables, fuses, relays, etc., but most likely the starter is going.
k is there power to fuel pump? yes,,, check grounds..... NO check relay only get kia relays for main and fuelpump since o2s run on the same relay,..... if relay is good suspect comp.... mine has same problem with no power to fuel pump i have now traced problem to ecu sux but at least it has a new fuel pump and relay lol.....