Motor Vehicle Maintenance & Repair Asked on July 17, 2021
I have a new Kia Stonic 2020 1.0L T-GDi ISG , got it on July and 8500km on it
It already had an issue with miscalibrated hill assist sensor (already fixed) so I wonder if it has other issues … what I’ve noticed:
thanks in advance for help and sorry if this is all normal! It’s my first new car so just wanna be sure I maintain it properly.
I'd like to respond to #2 and #4. The problem is likely poor combustion due to carbon deposits on the intake valves, spark plugs, fuel injectors and inside the combustion chambers. It is a very common problem with the GDI fuel system on your vehicle at that km's. I had exactly the same problem with two new cars with approximately the same km's (Jeep Compass and Mercedes E350).
The phenomenon is known as "lugging." The engine shakes at low rpm, at low speed. As you have discovered, it can be compensated with higher rpm or a lower gear. In your case, the root problem is uneven combustion and thus a lack of power.
The problem can be tough to remedy. Start by replacing the air cleaner. Add an entire bottle of this cleaner and this additive to a full tank of high-octane (RON 91) fuel. Note the heavy, 4x initial dose of Star Tron additive. Drive the car in a spirited manner, with plenty of heavy acceleration and at least five full-throttle blasts on the highway close to redline rpm. Avoid short trips under 15 minutes on a cold engine. Drop to a lower gear and maintain a steady, 3,500-4,000 rpm on the highway for at least 15 minutes (30 min. is optimal). After running half the tank with additives, spray this cleaner through the intake shutter. Continue to drive with additives until tank is near empty. When finished, change the crankcase motor oil (even if it is before its scheduled maintenance).
In the future, take preventive steps to maintain a clean engine. Continue to add a few drops of the Star Tron at every refill, using name-brand petrol. Avoid short trips under 15 minutes before the engine is fully warmed up, especially when outdoor temperatures are below 7° C. Drive the engine up to at least 3,500 RPM a couple of times during every warm-up cycle, and cruise very steadily at normal highway speed for at least ten minutes a day. Using petrol with an octane rating below 91 will accelerate carbon buildup in your particular engine (see your Owner's Manual for further details).
Answered by Carguy on July 17, 2021
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