Hi!
I have a Honda Fit 2018 1.5L 130Hp,49000 km. The acceleration is not consistent, occured (2-3 gear). What could be the problem?
Thanks.

 

Are we talking about stutter at somewhere around 2100-2300 RPM? There're lots of threads talking about that on manual transmission GK Fits.
Mine does it, especially when cold.

 

Manual transmission.
Between 1900-3000 RPM appeared the problem. Appeared in the both situation, cold and warm.

 

Some have said replacing the spark plugs seems to rectify the issue.
Not sure if that's the universal fix for it tho.

 

The spark splugs is replaced. 😕

 

If the problem occurs between 1350 and 2150 rpm, it's normal. The Earth Dreams 1.5L on the Fits has poor air and fuel mixing inside that rpm range, which can cause lumpy acceleration, especially on a cold engine. You can avoid the problem by shifting at higher rpm. I shift up at 17, 28, 36, 43, and 49 mph respectively. That keeps my RPM above 2200. If I'm under 27 mph, I usually shift up to a gear that I can keep my RPM under 1300 as long as I'm not going uphill or trying to accelerate. Otherwise I keep my RPM at or over 2200 at all times. I still never got less than 41 MPG US on a tank either, so it doesn't hurt gas mileage.