I have a 2017 Hyundai Elantra Limited with 26k miles. Everything is running normally with no codes, but the long term fuel trim is showing 10.5%. what should I do? Dealership won't fix it under warranty since it has no codes.
Normally, you don't want to go over 10% when adding LTFT and STFT together. Did you check for vacuum leaks? Can be many things such as MAP sensor, something in fuel system, etc. but I wouldn't worry too much if the car idles normal and drives good. You can try adding a fuel additive into fuel tank such as Techron or even better 505 CRF and see if that'll help.
You could try cleaning the throttle body and MAF sensor.
https://www.youtube.com/watch?v=NWCKvU2FmDc
Most Hyundai cars have MAP sensors that should not be cleaned. I might be wrong but I think it has MAP sensor. Good idea on throttle body cleaning...
Don't mess with the MAP sensor if that's what you have but you can clean the throttle body.
Thanks. I will Try out the fuel system cleaner first and see how things go. Thanks for the help.
long term fuel trim is showing 10.5%.
is this at idle with the engine fully warmed up?
Which engine?
