Timing chain tensioner - i started to get a weird rattle when i started the engine. the kia dealership told me this was a pretty common noise with these engines and not to worry. at 62k miles i took it back in and said something is definitely not right. well it was the timing chain tensioner. in searching for common issues i found several tsb's reporting the same thing. there is even a technical service bulletin that tells the service department what parts need to be replaced to resolve the issue but there is no investigations or recalls. i still had to pay 2500.00 to fix it.
When traveling above 25 mph , when i take my foot off the gas pedal in anticipation of an upcoming red traffic signal or on the highway doing 55 or so and seeing traffic coming to a halt ahead, foot off the gas pedal engine keeps going, will not throttle down to near idle. ,its as if the gas pedal is stuck . at this point i have to really brake hard to slow the car down, it is dangerous, especially at highway speeds..eventually as the car slows to a crawl the tachometer eventually shows the engine is down to idle speed., and the engine stops pulling on its own..my other issue involves the transmission downshifting to a lower gear and slowing the car down, i have no issues when accelerating, only when i tale my foot off of the accelerator,my kia dealer cannot duplicate problem even after several visits..i have made a short video of the speedometer and tachometer, and it clearly shows the the car going on its own, while my foot is off the gas pedal.