why wont my kia optima not start

Asked by dtsram0614 Feb 06, 2023 at 01:30 AM about the 2015 Kia Optima LX

Question type: Maintenance & Repair

i replaced cat/manifold, crankshaft censor, exhaust side cam shaft censor, all
fuses in engine bay car will turn over but no fire sprayed fluid in intake not
getting spark or ecm not telling it to fire checked for loose wires and found
none bank 2 o2 censor was unplugged and there is a connector in bank 1 o2
censor harness but nothing to plug into it.i even put old converter and
manifold back on same thing it started and ran for couple seconds but now
no fire its not throwing any codes no check engine light on and it should with
bank 2 o2 unplugged it has 140000 miles on body engine was replaced its
key start non turbo 2.4 it was low on oil nothing on dipstick. i have tried
everything but replace relays.

2 Answers

40,015

Things need to be diagnosed and tested not replaced with guess work . Those cars are disposable , low oil may have triggered a limp mode thing and may need a reflash who knows

310,255

Was the battery disconnected at any time? If so you may have activated the security system, that would explain the start then stop symptom. The owners manual will have the disarm procedure for your specific model.

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