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  1. Engine and Technical Discussion
    Check this out: https://www.autoblog.com/2019/07/08/hyundai-cvvd-engine-continuously-variable-valve-duration/
  2. Engine and Technical Discussion
    Hi trying to replace my pcv valve (cleaned it, but it's letting air pass). ordered one online, ordered one from a store. Both have a red gasket and the threads are longer than the current valve. Doesn't seem to seat properly. I can't find the blue plastic type pcv valve that came with the...
  3. The Service Center
    I have a 2012 optima ex 2.4. The check engine light came on with about 94,000 miles. Shows code P0444 which is purge control valve. I replaced the valve and the code returned within a few days. My first thought is to try another valve just to make sure the new one wasn’t defective. What do I...
  4. New Member Introductions
    Hey everyone. I know the maintenance sub-forum is probably a better place for this question, but I can't post there so here it is: I recently purchased a 2014 Optima EX. It has a lot of miles on it, and I'm not sure if the intake valves have ever been cleaned, so I bought some CRC GDI intake...
  5. DIY : Engine And Technical
    I've replaced my drain plug with a "Fumoto F-106N Engine Oil Drain Valve" ($25 at Amazon). I attach a clear plastic hose to the valve, turn the spring-loaded lever, and drain my oil straight into a container or catch basin. Previously the oil shot back pretty far behind the plug and inevitably...
  6. The Service Center
    I have '12 Optima and the AC system has leaked down. I have replaced system components before, used a vacuum pump, re-pressurized systems, etc. But only a shade tree mechanic. I bought a tool that lets you replace schrader valves in the AC pressure ports under pressure, and it works well...
  7. Engine and Technical Discussion
    I recently purchased an Uncle Chip from another member here on the forum, and have been waiting to break in the new warranty engine before installing. However, I was wondering, since I'll be creating more boost with the chip, should I go ahead and install an actual blow off valve? I'm currently...
  8. K5OS - Interior & Exterior Products
    Here to present another great product for your vehicle: K5OS Spiked Aluminum Valve Stem Caps (BUY NOW) Description: High-Quality Anodized Aluminum Valve Stem Caps Available in a wide variety of different color options Designed to replace your existing valve stem caps Great gift to give...
  9. The Service Center
    Had a misfire error after really rough idling, and checked the spark plug and found this... Now, after replacing the spark plug, I'm still getting a rough idle at low rpm and an error in cylinder 2. After a bit of searching online, I've found that it looks like I may have damaged the exhaust...
  10. Engine and Technical Discussion
    I have a 2011 optima 2.4. I think that my lifters needreplacing or adjusting, so I’m looking Under the service manual section (PDF) I’m looking at Kia Optima: Cylinder Head, Components andComponents Location. In the assemblydiagram it shows “9. MLA”. What does that stand for? Could it be...
  11. 3rd Generation Optima (2011 - 2015)
    What up guys, Installing a Greddy BOV and wanted to know if anyone had any tips. I've been researching the heck out of it and have seen some different things I hadn't heard of before. Every other BOV I've installed was pretty much just plug and play. But I've read about "Spring Mods" and...
  12. K5OS - 2016-2020 Kia Optima Products
    Is proud to present another great new product: The 2016-2020 Kia Optima 1.6T BOV Sound Plate (BUY NOW) Description: Specifically designed to fit the tight space for your 2016-2019 Kia Optima turbo Comes in 5 different colors (red, black, blue, purple, and silver) New stiffer bypass valve...
  13. Engine and Technical Discussion
    Today my Fomoto F106S valve drain arrived. I also ordered the 3/8 hose sockets and lock clip. I did not get a hose with my adapters(or sockets per Fomoto) so I will just pick one up for my next oil change. I will be installing it today or tomorrow when I do my oil change. Here is what I got...
  14. Engine and Technical Discussion
    Is there a time frame for changing the PVC valve on a KOH?
  15. Engine and Technical Discussion
    Howdy fellow 2.0t enthusiast... so I got my self the HKS SSQV 4 from K5 during the holiday sale and as the title states. As soon as I almost hit peek boost it drops considerably then climbs back up a few psi...it has also purged under throttle/WOT on me... .....sigh...any ideas anyone?
  16. Engine and Technical Discussion
    Good day gentlemen, I have a 2013 Optima EX turbo that is driving me crazy. Firstly I am a tech and at a loss why my 2.0T is experiencing engine vibration at idle. I am well aware of how GDI motors operate but this vibration is becoming more violent as time goes on. It has already been to the...
  17. Engine and Technical Discussion
    I read an Interesting article about GDI engines intake valve deposits, The author of the article said that detergents and cleaners that are added to gasoline have (almost) no effect on preventing or removing intake valve deposits in GDI engines. So adding products like techron fuel system...
  18. Engine and Technical Discussion
    I know there is a thread discussing this under TSB's but I have a totally different question. There is a voluntary service campaign for 2012-2013 Optimas that involves reprogramming the ECU to reduce wear on the "Flow Control Valve". Does anyone know where the "Flow Control Valve" is located...
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