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Hesitation/Shudder from a dead stop to moving

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by cardana24, Jan 19, 2015.

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  1. cardana24

    cardana24 Junior Member

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    Hey Guys,
    I have an 06 Prius that I have owned for about 300 miles now and I am trying to get everything sorted out. When I start out from a dead stop the car will have a hesitation/shudder/roughness when the ICE kicks in, it becomes really pronounce when you try to give the car heavy gas from a stop (it rattles the whole car). Once the ICE fully kicks on it is fine (or what I assume is fine since I have never driven one of these cars before). Also when the ICE turns off when coming to a stop it feels as if it sputters out more than just cutting right off. The car has brand new NGK plugs, new air filter, new PCV, and I just cleaned the throttle body and MAF. Has any one experienced this? I am wondering if it is not detecting throttle input correctly...is there a relearn procedure for the throttle? The car sat for several months while I was in the process of replacing my transaxle, not sure if it lost some programming while sitting. I have also replace my 12v battery just before I drove the car...again not sure if I lost some programming when doing that. My CEL is on for the converter P0420. I have driven the car about 300 miles and I am averaging ~47mpg. Thanks for any help.
     
    #1 cardana24, Jan 19, 2015
  2. GregP507

    GregP507 Senior Member

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    In my "non-expert" opinion, needs a tune-up.
     
    #2 GregP507, Jan 19, 2015
  3. cardana24

    cardana24 Junior Member

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    What should I change/check? The "tune up" parts are new.
     
    #3 cardana24, Jan 19, 2015
  4. GregP507

    GregP507 Senior Member

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    Sensors, I'd say.
     
    #4 GregP507, Jan 19, 2015
  5. bisco

    bisco cookie crumbler

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    how many miles on her? you probably need a complete overhaul.plugs, injectors, wires, throttle body, you know, the whole nine yards.
     
    #5 bisco, Jan 19, 2015
  6. cardana24

    cardana24 Junior Member

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    163k miles. Also, the plugs that I installed are copper core NGK plugs. I know these cars come with Iridium plugs, but I have always just run copper cores in all of my cars and I have never had an issue, I just change them more often. Could this cause a problem?

    Bisco, as stated above the "tune up" parts are new and I just cleaned the throttle body. Would an injector problem only show it's self when starting up? The car runs well once it is moving. Not really sure which wires you are talking about, I have COP.
     
    #6 cardana24, Jan 19, 2015
  7. edthefox5

    edthefox5 Senior Member

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    Drivability issues on old engines with high miles are sometimes Hard to pin down.

    Has the car driven like this since you bought it pre
    Tune up?

    How do you know about the po42? Do u have a mini VCI? Sounds to me like the throttle body or MAF is not right. But if the mad is really unhappy
    It will throw a nag.
    U say u cleaned it how corroded is it?
     
    #7 edthefox5, Jan 19, 2015
  8. cardana24

    cardana24 Junior Member

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    Yes, I have not driven the Prius many miles, so yes, it has always done this since I have owned it.

    I know about the P0420 because I have an OBDII scanner. I also own a mini VCI cord but I have not used it yet. I cleaned the MAF with MAF cleaner from the parts store. And I cleaned the throttle body by spraying carb/choke cleaner onto a rag and holding the butterfly open and wiping down the t/b neck. I did not think it was that dirty, I just did it while I was in there. Do these cars have any sort of throttle calibration?
     
    #8 cardana24, Jan 19, 2015
  9. Easy Rider 2

    Easy Rider 2 Senior Member

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    Don't overlook the obvious.
    If there is a single code set and it points to the CAT converter, then that likely IS the problem.

    Ignoring that and screwing with other things might just make matters worse.
     
    #9 Easy Rider 2, Jan 19, 2015
  10. cardana24

    cardana24 Junior Member

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    I hear you. The P0420 code comes back quickly. I have cleared it several times and it always comes back in about 30 miles, so I am sure the is an issue. Would a CAT issue cause what I am describing?
     
    #10 cardana24, Jan 19, 2015
  11. JC91006

    JC91006 Senior Member

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    I think you should put in the correct ngk plugs. It's less than $40 and might fix your problem
     
    #11 JC91006, Jan 19, 2015
  12. nh7o

    nh7o Off grid since 1980

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    Do a scan with the mini VCI! As often is the case, generic readers don't give all the info. You may have other DTC's.

    Others have seen the cat P0420 DTC eliminated with a change of A/F sensor. Your MPG's are within the proper range. Disconnecting the 12V battery for a few minutes and reconnecting is all the ECU needs to do a relearn of the system, no other programming is possible.
     
    #12 nh7o, Jan 19, 2015
  13. Easy Rider 2

    Easy Rider 2 Senior Member

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    Yes to all of the above.
     
    #13 Easy Rider 2, Jan 19, 2015
  14. valde3

    valde3 Senior Member

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    No. Low catalytic converter capacity won’t effect drivability at all. But you should read codes with techstream since there might be another more important code. If there isn’t cat code may also indicate some other problem. Catalytic converter can effect drivability only if it’s blocked.

    How much oil does it use?

    You can reset (to get it to relearn) idle calibration (and other stuff) by leaving 12V battery unconnected for 10min. You should do that after cleaning throttle plate and MAF.
     
    #14 valde3, Jan 19, 2015
  15. cardana24

    cardana24 Junior Member

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    No clue on how much oil it uses, I have only driven the car about 300 miles so far. I'll do the reset, I did not do that after I cleaned the MAF and t/b cleaning.
     
    #15 cardana24, Jan 19, 2015
  16. edthefox5

    edthefox5 Senior Member

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    Yeah like Easy says we see many cat cels and it seems to affect the drivability of the car. Time for a new Cat. Your not in a Carb state so should be able to use an aftermarket cat. Start there. Search here and there's some posts about cat purchases.

    Whats up with the transaxle swap? Got any pictures....we like pictures....transaxle porn.
     
    #16 edthefox5, Jan 19, 2015
  17. JC91006

    JC91006 Senior Member

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    I actually think he got a bad transaxle but unless there are codes pointing that direction, you really can't say it's the transaxle
     
    #17 JC91006, Jan 19, 2015
  18. edthefox5

    edthefox5 Senior Member

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    He said he replaced the transaxle.
     
    #18 edthefox5, Jan 19, 2015
  19. JC91006

    JC91006 Senior Member

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    Yes, from a junkyard. It's guaranteed but who wants to do that again?
     
    #19 JC91006, Jan 19, 2015
  20. edthefox5

    edthefox5 Senior Member

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    Ok...he needs to baseline this issue then. My take on it is the car always shuddered even after new trans?

    OP please clarify.
     
    #20 edthefox5, Jan 19, 2015
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