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Discussion Starter #1
So my Cadenza is now 14 months old and has around 15,000 miles on it and I'm starting to notice a rough idle at start up to the point the whole car shakes for a couple of minutes. Does anyone else have this issue. I will be taking it to the dealer in a couple of weeks. I'm sure I'll get the same response from the service manager "Everything is OK".
 

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Mine has a rough noise when it starts then in 30 seconds it goes away
 
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It does it about every start now as well.
 

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I had a scare a few days ago. It sounded like it was just the starter that kept going off. Some cranking and that's about it, no turnover. It kept doing it too, about 5 or 6 seconds until I pressed the ignition again and it stopped. I already took my foot off the break as well. I gave it a rest for a few seconds and it started right up. Not sure what that was all about but I wanted to know if any of you have experienced that at all.
 

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Discussion Starter #6
So I just dropped off my car at the dealer for the wheel replacement and told them to check the rough start issue I feel. They call me this morning and said YES we think something is wrong and want to keep the car to check it out better Monday. If anything is found I will report it here. I also started to see smoke out the back under hard acceleration.
 

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Discussion Starter #7
Update-

So the dealer called and said they have found a bad timing chain tensioner. They are going to replace it along with the timing chain as they believe that this is causing the rough idle.

I will report the success and quality of the repair when I get my car back.
 

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Nice let us know, my car has been with the dealer for nearly a week now because they keep getting damaged wheels for the recall. The "overnight" always takes 2-3 days instead on the wheels. Apparently KIA can't figure out how to box a set of rims.
 

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I took it in for the same issue and they replaced my injectors 2 & 6 and I'm still having the same issues. I will let them know about the timing chain...
 

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Discussion Starter #10
Second update. So I received a call from the dealer and they told me they'll need the car another week???? They are replacing the fuel rails, some of the injectors and the cam shafts. I'm not quite sure how to feel about this. At the very least they are covering the rental car and do all this work without a question. They MUST know something something about this motor.
 

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Second update. So I received a call from the dealer and they told me they'll need the car another week???? They are replacing the fuel rails, some of the injectors and the cam shafts. I'm not quite sure how to feel about this. At the very least they are covering the rental car and do all this work without a question. They MUST know something something about this motor.
Nice. I guess I'll complain about this if it's that serious. Just thought it was the motors characteristics. We messed up buying the first ones off the assembly line.
 

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Nice. I guess I'll complain about this if it's that serious. Just thought it was the motors characteristics. We messed up buying the first ones off the assembly line.
We are not the first off the production line for this engine - it's been available in Korea for some time in the K7 (current generation launched in 2012 as a 2013 model year) and in the Sorento. Hyundai uses the same engine in the Azera/Grandeur, Genesis, and Santa Fe. There are also other variations of this engine in different displacements available in other markets.

I have not had the issues described in this thread, but I'm only at 7200 miles. I'm keeping an eye on it.
 

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We are not the first off the production line for this engine - it's been available in Korea for some time in the K7 (current generation launched in 2012 as a 2013 model year) and in the Sorento. Hyundai uses the same engine in the Azera/Grandeur, Genesis, and Santa Fe. There are also other variations of this engine in different displacements available in other markets.

I have not had the issues described in this thread, but I'm only at 7200 miles. I'm keeping an eye on it.
.. always someone. It was a general statement, since we bought the cars in the first year they were manufactured and Kia took it upon themselves to change the model completely while still being the 14' Cadenza. Now they added trim levels, ventilated seats, better components etc.

My car is a year old and has 3300 miles on it, starts up rough since day one. Always thought that was just the way the engine was built. In addition to the transmission being clunky when it shifts until it warms up.
 

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Discussion Starter #14
Third update:

So just got off the phone with KIA and I found out that the part list is growing. Because the cam shafts are being replaced the CVVT also needs replacing along with some update on the cylinder heads that have been pulled off and sent out for machining (?). I was told this was needed for the update. I don't know what this update is all about and I doubt that I will be able to find out. If I do get a direct answer I will update this thread.
 

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This is interesting. This was a similar issue that I was having. However, ours escalated into losing power. It was primarily when we were in high gear, high load, and low rpms. So basically, 6th gear, full throttle, low rpms. Next thing you know, the check engine light was coming on and flashing.

Turns out they had to replace the injectors and fuel rail.

It's doing better but still shaking at idle quite a bit.
 

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Discussion Starter #18
Final update.

After a long repair time of ~ 27 days I left the dealer only to return the next morning. It came to light that the dealer only replace half of the parts they thought were bad. After another 2 weeks in for repairs and a couple of discussions with the dealer and KIA corp I have decided to pursue a Lemon Law case for my car.

I'm not really happy about it but for a car with only 17,000 miles on it I believe that this work has greatly reduced the value on my car.

I only hope that this car is the exception.

Regardsm
 

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Final update.

After a long repair time of ~ 27 days I left the dealer only to return the next morning. It came to light that the dealer only replace half of the parts they thought were bad. After another 2 weeks in for repairs and a couple of discussions with the dealer and KIA corp I have decided to pursue a Lemon Law case for my car.

I'm not really happy about it but for a car with only 17,000 miles on it I believe that this work has greatly reduced the value on my car.

I only hope that this car is the exception.

Regardsm
The work wouldn't decrease value of the car, but I would still pursue lemon law if it had that much time in the shop. Mine has a slightly rough start up, but goes away after 20-45 seconds. No other issues.
 

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Discussion Starter #20
The work wouldn't decrease value of the car, but I would still pursue lemon law if it had that much time in the shop. Mine has a slightly rough start up, but goes away after 20-45 seconds. No other issues.
My car started the same way, rough for a very short time eventually increasing but what worried me the most was the smoke coming out the exhaust. That was the valve seats going bad. If you have a newer motor the cam shafts will not need replacing when the CVVT valves go bad. The re-designed CVVT valves will not fit the older cam shafts.
 
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