Throttle jumpy when trying to maintain speed.

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by zoeboi954, Jul 21, 2025 at 10:26 PM.

  1. zoeboi954

    zoeboi954 Junior Member

    Joined:
    Sep 10, 2014
    78
    22
    0
    Vehicle:
    2010 Prius
    Model:
    III
    So when im driving to maintain a certain speed like for example trying to drive at 45mph the throttle input (mpg) start to become slightly jumpy. it would jump from about 40 mpg to 80mpg while I am keeping the same pressure on the gas pedal. You can feel the difference in acceleration when it happens..
    info about the car 2013 prius with an 2018 gen 4 engine euro/jdm version.

    Has anyone experienced this? how do I fix it?

     
    #1 zoeboi954, Jul 21, 2025 at 10:26 PM
  2. NutzAboutBolts

    NutzAboutBolts Senior Member

    Joined:
    Mar 5, 2013
    1,629
    1,707
    0
    Location:
    Bay Area
    Vehicle:
    2012 Prius
    Model:
    Four
    No check engine light?

    did it do that before?

    I wonder if it could be the engine swap parts that is affecting the engine signals. Your speed looks to be maintained besides the mpg gauge on the right.
     
    #2 NutzAboutBolts, Jul 21, 2025 at 11:58 PM
  3. Grit

    Grit Senior Member

    Joined:
    Aug 22, 2017
    6,463
    4,197
    1
    Location:
    Wilkes Land
    Vehicle:
    2012 Prius
    Model:
    Four
    You should be blessed If car goes From 40 was To 80 mpgs
     
    #3 Grit, Jul 22, 2025 at 12:17 AM
(You must log in or sign up to post here.)