Hello, I am sharing with you an issue I’m having with my I30 1.0 T-GDI for more than a year now. When I start the engine in the morning, or after the car is standing for a longer period of time, when I accelerate, the car is not accelerating constantly, it has a few milliseconds when even if I press the gas pedal, it does not have power to accelerate. This happens only when I start the cold engine, if I drive again after a few hours, the car doesn’t have this issue anymore. I was twice to Hyundai, they plugged the computer and said all is fine. I even left the car there over the night, but they said they did not notice the issue when driving off in the morning. I am a bit desperate, since I need to take a decision if I keep it or not. Hope someone can help. Thanks.

 

Did the vehicle behave this way right from the time you purchased it ?

 

Hi, no, this started last winter, the car was already a year old by than.

 

Sometimes problems evade discovery and sounds like this is one of those times.
Not knowing everything the dealership did , I can only speculate.

If the vehicle only has this problem when cold, why not go over what is supposed to happen before the engine reaches "Operating temperature"

Until a certain period of time passes, until the oxygen sensor heats up to it's operating temp, until the engine coolant temp senor reaches it's proper temperature, all the fuel the injectors deliver is supposed to be adequate for cold weather operation. That is supposed to be programmed into the Powertrain control module.,open loop.


When the above conditions are met the engine goes into closed loop operation and fuel delivery is much closely controlled to control emissions.
Now you have some idea of what is supposed to happen,and you can inquire if those items were checked. Also , if any one of those items were slightly "Off spec" they don't necessarily throw a code, but will affect driveability..