2007 with reduced engine response on cold start after sitting for 2 days

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by 08priusowner145, May 8, 2022.

  1. 08priusowner145

    08priusowner145 Junior Member

    Joined:
    Dec 4, 2016
    5
    1
    0
    Location:
    Connecticut
    Vehicle:
    2008 Prius
    Model:
    Two
    Someone I know has an 07 Prius with 191,000 miles on it. Whenever it's sat for more than a day, you can start it with no issue on a dead-cold start and back out of the driveway, but when you try to drive it up the hill she lives on, the engine has significantly reduced power up the hill. About 15 seconds into the climb, it finally responds, revs the engine high, and suddenly kicks in with power surging faster up the hill. There are no codes. This new happens when the vehicle has been driven within the last few hours and is only when it's very first started completely cold.

    Lately, she's only been driving it about .5 to one mile a day twice a day, so fuel economy over time is difficult to judge. The vehicle is only running long enough to get the catalytic converter hot (so the engine is on and not in EV mode at all) the whole time it has been running.
     
  2. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    97,611
    44,285
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    sounds like you're starting out in ev, then the engine kicks in and is going through the warm up cycle.

    you've got an old weak battery that isn't helping as much as it used to.

    the worst thing you can do is let these cars sit around, the cells start to go out of balance, and driving a mile is terrible for the engine.

    has she done any engine maintenance?
     
    edthefox5 likes this.
  3. Another

    Another Senior Member

    Joined:
    Jun 22, 2021
    1,471
    389
    0
    Location:
    Naples, Florida
    Vehicle:
    2007 Prius
    Model:
    Touring
    Driving two miles a day doesn’t even give the 12v battery time to recharge much less allow the HV battery to condition itself. If the plan is to no drive much in the long term, probably a good time to consider selling the car and getting a conventional IC vehicle. Current market for used Prius is good to sell.
     
  4. edthefox5

    edthefox5 Senior Member

    Joined:
    Jul 25, 2007
    9,729
    4,574
    0
    Location:
    Clearwater, Florida
    Vehicle:
    2007 Prius
    Model:
    Two
    Start looking at the hybrid battery charge level.

    Probably in purple or even red in the am. No hybrid battery participation= no power.

    2 miles a day is guaranteed to keep the hybrid and 12 battery in constant undercharge. It will eventually kill the hybrid battery at that age. At the minimum it will excite rust on the battery connections.

    We saw hundreds of hybrid battery’s fail during covid no one drove much for months.
     
  5. 08priusowner145

    08priusowner145 Junior Member

    Joined:
    Dec 4, 2016
    5
    1
    0
    Location:
    Connecticut
    Vehicle:
    2008 Prius
    Model:
    Two
    Thank you, everyone. Although the readings on the hybrid battery seemed to always be good upon start-up, I suppose that could have been part of the issue. The engine seems to have developed a serious stumble since I posted but still no code. She took it as a sign and decided to trade it in for a different vehicle. Thank you all again. Take care.
     
    edthefox5 likes this.
  6. edthefox5

    edthefox5 Senior Member

    Joined:
    Jul 25, 2007
    9,729
    4,574
    0
    Location:
    Clearwater, Florida
    Vehicle:
    2007 Prius
    Model:
    Two
    Wise move.
     
  7. Another

    Another Senior Member

    Joined:
    Jun 22, 2021
    1,471
    389
    0
    Location:
    Naples, Florida
    Vehicle:
    2007 Prius
    Model:
    Touring
    Did they give you $1200?
     
  8. 08priusowner145

    08priusowner145 Junior Member

    Joined:
    Dec 4, 2016
    5
    1
    0
    Location:
    Connecticut
    Vehicle:
    2008 Prius
    Model:
    Two
    For the trade-in? She got $2000.00 for it.
     
  9. Another

    Another Senior Member

    Joined:
    Jun 22, 2021
    1,471
    389
    0
    Location:
    Naples, Florida
    Vehicle:
    2007 Prius
    Model:
    Touring
    Good deal for the buyer
     
Loading...