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Hyundai 1.6t GDI high LTFT. Stumbles. Poor performance
3 years 3 months ago #46225
by Takeeon
Hyundai 1.6t GDI high LTFT. Stumbles. Poor performance was created by Takeeon
Greetings! I'm glad I found your forum! Your videos have taught me so much!
I've got a 2019 Hyundai Elantra GT N-Line AT
Since the day I brought it home, it's had an issue with inconsistent performance, stumbling at partial throttle, sulfur smell on highway on ramps, etc.
The dealer has been basically useless because it hasn't thrown a single code. No stored codes. No warnings. It's been in no less than 20x for the issue and occasionally runs properly, especially around certain temperatures (usually around 35f). They have replaced coils and even went as far to replace the entire transmission with no improvement.
One thing is, the car runs best after a computer reset, then slowly gets worse and worse as time goes on.
I've bought various scanners and scopes. Although my initial thought was bad coils or plugs, scoping the coils shows the ignition system is working properly.
The scanners seem to show no issue with the oxygen sensors and when the car isn't running, the MAP shows what seems to be normal atmospheric pressure at sea level.
The only thing I can find that's peculiar is my LTFT. At idle, it usually hangs around +15-20% and drops to about 6% when driving.
At this point I'd rather drive the thing off a cliff then take it back to the dealer and have them tell me there's nothing wrong one more time.
There is also a small community of folks on various forms with the same issue that remains unresolved.
Any of your infinite wisdom that could point me in the right direction would be much appreciated!
Here's some screen grabs from torque pro:
I've got a 2019 Hyundai Elantra GT N-Line AT
Since the day I brought it home, it's had an issue with inconsistent performance, stumbling at partial throttle, sulfur smell on highway on ramps, etc.
The dealer has been basically useless because it hasn't thrown a single code. No stored codes. No warnings. It's been in no less than 20x for the issue and occasionally runs properly, especially around certain temperatures (usually around 35f). They have replaced coils and even went as far to replace the entire transmission with no improvement.
One thing is, the car runs best after a computer reset, then slowly gets worse and worse as time goes on.
I've bought various scanners and scopes. Although my initial thought was bad coils or plugs, scoping the coils shows the ignition system is working properly.
The scanners seem to show no issue with the oxygen sensors and when the car isn't running, the MAP shows what seems to be normal atmospheric pressure at sea level.
The only thing I can find that's peculiar is my LTFT. At idle, it usually hangs around +15-20% and drops to about 6% when driving.
At this point I'd rather drive the thing off a cliff then take it back to the dealer and have them tell me there's nothing wrong one more time.
There is also a small community of folks on various forms with the same issue that remains unresolved.
Any of your infinite wisdom that could point me in the right direction would be much appreciated!
Here's some screen grabs from torque pro:
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