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Rough Short Start, then it cuts off...

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Fishcrab, Aug 22, 2015.

  1. Fishcrab

    Fishcrab Member

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    My car has about 160k, and it's mostly a highway car once a month, with some errands across town, when home. Sometime after not starting it for a few days, it will start roughly like dieseling for 10 sec, then cutting off. Then 10 seconds later, it starts normal with no dieseling , and off I go with no problems. Goes without saying I'm talking about the ICE.
    Plugs, air filter , good gas, all good on those accounts.
     
    #1 Fishcrab, Aug 22, 2015
  2. JC91006

    JC91006 Senior Member

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    it's wear from 10 years 160k miles
     
    #2 JC91006, Aug 22, 2015
  3. Mendel Leisk

    Mendel Leisk Senior Member

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    What's "dieseling" again? I've heard the expression, but it's just not clicking.
     
    #3 Mendel Leisk, Aug 22, 2015
  4. Fishcrab

    Fishcrab Member

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    This is from Wikipedia , the definition may be more than just this, but Wiki, gives you a basic idea.

    1. Dieseling or engine run-on is a condition that can occur in spark plug, gasoline powered internal combustion engines, whereby the engine keeps running for a short period after being turned off, due to fuel igniting without a spark.
     
    #4 Fishcrab, Aug 22, 2015
  5. bisco

    bisco cookie crumbler

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    i suppose it's time to check the injectors, throttle body, maf sensor, and etc. have you checked for trouble codes?
     
    #5 bisco, Aug 22, 2015
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  6. Fishcrab

    Fishcrab Member

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    No, have not check for trouble codes , but will.
    I honestly have never cleaned throttle body.
    I think I saved some notes about that from Patrick Wong.
    Thanks for the ideas.
     
    #6 Fishcrab, Aug 22, 2015
  7. Mendel Leisk

    Mendel Leisk Senior Member

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    Dieseling then likely means something's acting like a spark plug. Glowing hot carbon deposits?
     
    #7 Mendel Leisk, Aug 22, 2015
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  8. Fishcrab

    Fishcrab Member

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    Could be, going to start with codes and cleaning throttle body.
    I'm not getting any notice of codes, but guess they can come up with the right tool.
     
    #8 Fishcrab, Aug 22, 2015
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  9. Mendel Leisk

    Mendel Leisk Senior Member

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    Probably not the case, with a cold engine.

    Arguing with myself, lol.
     
    #9 Mendel Leisk, Aug 23, 2015
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  10. andrewclaus

    andrewclaus Active Member

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    I agree to start looking at the fuel system. At this point I would invest in a mini-VCI.

    My Prius has the same age and mileage. Just the other day after a complaint of rough idling I cleaned the MAF sensor and throttle body, using the tips found herein. They were both very dirty, and the 30 minute project went very well with good results.
     
    #10 andrewclaus, Aug 23, 2015
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  11. Fishcrab

    Fishcrab Member

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    Good advice Andrew, plan to do that today, glad it work for you.
     
    #11 Fishcrab, Aug 23, 2015
  12. Fishcrab

    Fishcrab Member

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    When I have the weird short idle, it is usually when ICE Is dead cold.
     
    #12 Fishcrab, Aug 23, 2015
  13. 69shovlhed

    69shovlhed Surly tree hugger

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    clean the throttle body 1st.
     
    #13 69shovlhed, Aug 23, 2015
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  14. Fishcrab

    Fishcrab Member

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    Good point for sure...
     
    #14 Fishcrab, Aug 23, 2015
  15. Fishcrab

    Fishcrab Member

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    Can't seem to find my info on how to clean the throttle body and clean the MAF sensor, I know there are two different cleaners. Could someone post again the correct way to do this on a gen 2. If you have product names, that would be helpful too. Seems something needs to be unplugged?
    Thanks
     
    #15 Fishcrab, Aug 23, 2015
  16. andrewclaus

    andrewclaus Active Member

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    Here's the thread I referred to. There are others. I used denatured alcohol for the TB and a can of CRC MAF cleaner for the sensor. I found it simple to remove the air cleaner housing (two hose clamps, two bolts, all 10mm) and then remove the MAF (two Phillips screws). I used a cotton rag and several swabs for the TB.
     
    #16 andrewclaus, Aug 23, 2015
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  17. JC91006

    JC91006 Senior Member

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    I don't think the throttle body is his problem if the car runs normally after 10 seconds. The car actually doesn't sound like it has a problem at all, it's just age and wear related. I guess it wouldn't hurt to clean the TB and MAF but I wouldn't expect it to cure a non problem. If there were issues, you would have a warning light
     
    #17 JC91006, Aug 23, 2015
  18. Fishcrab

    Fishcrab Member

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    Great Andrew, just what I was looking for, you have been a great help.
     
    #18 Fishcrab, Aug 23, 2015
  19. Fishcrab

    Fishcrab Member

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    Maybe your right JC, will do this other stuff, just for preventative maintenance .
    The rough start only happen once in a blue moon anyway. Maybe it's just coughing something up, heheh
     
    #19 Fishcrab, Aug 23, 2015
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