Question about 2004 Kia Optima

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2005 Kia Optima auto trans problem

I have the LX with the 2.5L 4-cyl.....starting at around 30,000 miles the transmission started upshifting extremely hard when changing out from 3rd to 4th gear at times, so soon after that I had a transmission flush performed, but it has continued. I dropped it off at the Kia dealership 3 times while it was still under warranty but they claimed to not be able to tell anything was wrong with it, so I continued driving it. It now has 70,000 miles and the car still runs excellent except that the transmission continues to slam into gear on upshift sometimes (and if it does it while under acceleration it's quite brutal), so I'm worried about future transmission and/or CV joint problems. I plan on getting the transmission flushed again very soon, but don't have any hope of that fixing the problem anymore than the first flush did, so what else could possibly be causing that? (Also, no check engine lights have ever came on either)

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  • jim2317 Oct 20, 2008

    I have a similar issue except a bit more fully blown now and starts up in 3rd gear and when put in reverse it slams into gear and physically jerks the car. I took out the air cleaner and noticed a plug on top of the gearbox has been dislodged AND slightly shattered (possibly from all the jerking around) but i did manage to put the plug in place long enough to completely fix the problem. only problem for me now is that because it is shattered it lkeep slipping out, so I am going out to look for a replacement tomorrow, from what the wreckers tell me it is called a "neutral start plug." Hope that helps.



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I had the same problem... just got my car services and took car to transmission spec. they told me that its the pump inside the tranny thats broken or something. while the pump is working >ie under acceleration it blows fluid out the seal (which seal im unsure) once the fluid level drops below the seal level it wont blow as much fluid out. if you check the levels you should notice that the fluid is well under level. Major job because you need to remove the transmission to get to the problem If that isnt the problem another issue could be a seal on the left or right driveshaft.This isnt as major as the other because you wont need to remove the transmission but time is required to remove the driveshafts to replace the seals. The first problem cost me about $600AU

Posted on Mar 14, 2009


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SOURCE: "transmission "slams" sometimes when upshifting.

you have bad transmission mounts, they are a bit difficult ot replace on that model of Buick as the front mount is in a tight area that requires the engine to be lifted up, out of the engine cradle.

Posted on Apr 20, 2011

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