2012 Kia Rio cranks but won't start following loss of power - Kia Forum

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post #1 of 2 (permalink) Old 06-15-2019, 03:02 PM Thread Starter
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2012 Kia Rio cranks but won't start following loss of power

I have a 2012 Kia Rio 1.6L that began experiencing issues with intermittent cranking and power loss roughly 4 months ago. Replaced the spark plugs and coil packs after noticing sudden misfires in cylinders 1 & 2. I had the OBDII codes checked subsequently to make sure I took care of the issue, and while the misfire codes were no longer present, it showed P0326 (Knock sensor), P0420 (Catalytic system performance below threshold bank 1), and P0335 (Crankshaft Pos. Sensor). I drove the car for about a month afterwards with seemingly no issues, until it started having problems starting. The starter is turning over just fine, but at times would not catch, or would catch for a moment but start to stall out unless I patted the gas. After a couple or a few tries it would crank, and would drive fine. Just a sidenote but I noticed this issue seemed to only happen after the car had been running for some time or hot.
So I ordered a crank sensor and put it on. Car cranked right up. The code also went away. Not a month after putting the CKPS, while commuting to work I noticed an extreme loss of power, almost like what a misfire feels like, but without the skipping. I barely got the car to a safe place to park it, and did not try to drive it again for fear of exacerbating the problem. I was able to borrow a scanner and received the following:
P0326 (Knock sensor) again
P0420 (Catalytic system.. etc) again
P2191 (System too lean under heavy load).
So I ordered the knock sensor and both the upstream and downstream O2 sensors based on the codes above. Oh and a MAP sensor as well for good measure.
At this point the car would start, but accelerating was much louder than normal and would cause it to stall out eventually. Ok so I was feeling pretty confident that I had a positive fuel trim, and a few sensors would take care of the problem.
After changing the upstream O2 and MAP, there was no change, and the more I read I'm starting to think that the Cat is clogged, creating the excess air and lean condition.
I planned to take the Cat off today to see if it is clogged, and if the issue would resolve after removal, but to my surprise now my car will not even crank. The starter is turning over, but it won't catch. I turned the key to ON and I'm pretty sure I heard the fuel pump priming, so I'm not sure why it will not start now?
I needed to get it on some ramps to get the cat off but instead had to push it up an incline and let it roll onto the ramps. I guess I'll go ahead and change the knock sensor and downstream O2 while I'm under there, but the question still remains about it cranking. Also, if I take the cat off do I need to reset the ECM before trying to start it? I'm worried that it's over compensating with too much fuel as a result of the p2191.
Any advice or help would be most appreciated, I'm doing this by myself since I'm past the warranty and don't have hundreds of dollars to spend on a diagnosis, this is my only vehicle for work. Thank you in advance for your time!

(If you saw this post in "Other Kia Models", it is because I am new to this site and did not see the Rio forum initially. Apologies for the duplicate post)

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post #2 of 2 (permalink) Old 06-15-2019, 09:35 PM
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Seeing as its not starting now, try some starter fluid in the intake, and if it starts with that you know its a fuel delivery issue, if it doesn't start with that, then a little more in depth diagnostics will be needed.

Typically a choked CAT will still allow a start.

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