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2007 Kia Sedona EX
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2006 Optima base model Octane Knock. Looking to figure out why this is happening and what I can do to fix it. If I run regular unleaded I get moderate to severe octane knock going up hills. If I run super unleaded it is gone. Any suggestions?????
 

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2011 Forte SX 2.4L (thankfully MPI) A/T 144K miles
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Not a good idea to create a separate thread for the P2138 (and omit that information from this one), when there's a possibility everything is related. You're saying there's a difference in performance when the octane is changed, but have you actually been able to alternate the gas enough times to establish that fact for certain? If it were mine, I'd diagnose/fix the P2138 and see how performance is after that, before doing anything else.
 

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99 Kia Elan 1.8L, 17 Ford Edge Sport 2.7L V6, 15 Mustang 3.7L V6, 08 Harley Nightrain
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Discussion Starter #4
Hi All Getting a random p2138 code that resets and is fine afterwards for a week or two. I unplugged the accelerator connector and inspected it. Looked fine. Any suggestions? Thank You
Is this an issue with your 2007 Sedona EX or the 2016 Optima Base model - trying to identify which forum subsection this should be in.
 

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99 Kia Elan 1.8L, 17 Ford Edge Sport 2.7L V6, 15 Mustang 3.7L V6, 08 Harley Nightrain
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Discussion Starter #5

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99 Kia Elan 1.8L, 17 Ford Edge Sport 2.7L V6, 15 Mustang 3.7L V6, 08 Harley Nightrain
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Discussion Starter #7
2006 Optima base model Octane Knock. Looking to figure out why this is happening and what I can do to fix it. If I run regular unleaded I get moderate to severe octane knock going up hills. If I run super unleaded it is gone. Any suggestions?????
??????
 

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2007 Kia Sedona EX
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36 Posts
When I switch to super unleaded it is gone in five miles. When I fill back up with regular its back in about ten miles. So Yes its fact
 

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2011 Forte SX 2.4L (thankfully MPI) A/T 144K miles
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1,181 Posts
It might help quite a bit to find out what some of the important OBD realtime data values are, particularly when the knocking is taking place. Torque for Android is the most popular, however there are others as well, including commercial off-the-shelf units.
 

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99 Kia Elan 1.8L, 17 Ford Edge Sport 2.7L V6, 15 Mustang 3.7L V6, 08 Harley Nightrain
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Discussion Starter #13
would changing spark plugs help? maybe a hotter plug or maybe a bosch platinum +4 type plug????
There would be no diagnostics behind such an experiment, and its risky.
 

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2007 Kia Sedona EX
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36 Posts
I installed new stock plugs and a new air filter. Not much in the way of a change. I did notice that the knock almost goes away if I put it in sport mode and lay on the gas a little more than I would like. Still puzzled.
 
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