[BenderBeetle]

I had the 2019 kia optima for almost 4 months and the timing chain rattles in cold weather at start up every day, ever since the first day I bought it. It has 4080 miles. It doesn't sound normal even though Kia says it is. A new car shouldn't rattle in the cold at start up. It only last for a couple of seconds. Also the timing chain rattles upon acceleration which is really annoying no matter what the weather is outside. It sounds like i'm driving a sewing machine. I got so embarresed to drive my car around because of this. My car also shakes when stopped sometimes. Took this car to Kia for inspection and they say nothing is wrong. This car is cheaply made. Is this normal, even though Kia says it is?

 

[Turbonut]

I'd say it's not the timing chain that's causing the rattle. The car is not what one would call quiet when running, especially after a cold start. In fact, the wife mentioned the other day when she came to the car while it was idling in the driveway, and remarked how loud it sounded, new engine 4900 miles. The HP fuel pump emits quite a bit of noise when running.

 

[Bob2C]

I know the 6 cylinders had an issue but haven’t heard of the 4’s doing it.

https://static.nhtsa.gov/odi/tsbs/2016/SB-10090819-5448.pdf

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[mturinka]

I know the 6 cylinders had an issue but haven’t heard of the 4’s doing it.

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[KingFatty]

What kind of cam chain tensioner is involved? Is it hydraulic?

If it's hydraulic, maybe there is something going on with how long it takes to get up to pressure. Perhaps the gasket is restricting oil flow so it takes longer to tension the chain?

 

[JasonS]

Its not the timing chain. Our timing chain is a true chain, its thick, and berried deep in the engine. Id suspect the HPFP or a pulley.