Cold Start and Shifting and Idle Problems

Discussion in 'General Motoring' started by Dustin H via CarKB.com, Aug 18, 2005.

  1. Hi

    I've got a 2001 Accent GS, and it's having 3 problems.

    1) Cold Start - On a cold start, the engine will chug / putter until i give
    it some gas to rev the engine, then all is good. If i don't give it any gas,
    it'll stall out. Once it's been started once, this problem is gone.

    2) Shifting - When comming to a stop, the trans. will quickly shift up, then
    down, for each gear as i slow down. Once i'm at a stop, the idle is
    slightly higher (about 1100rpm instead of 800-900)

    3) Idling - When the car is in neutral, the idle is higher then normal, but
    varies. Again, if i give it some gas, and bring the rpm above 3k and let it
    drop back down, it will go back to idling fine.

    Now here's the weird part. All 3 of these things are completely intermittent.
    They all happen at the same time, but the car can go days with no problems,
    and some days, it does it all the time. Generally, all symptoms are present,
    or all are gone. No middle ground.

    I took it into a service center, they couldn't find anything. They said O2
    was fine, fuel in and out was OK.
    No fault codes where present. They couldn't explain the shifting problem.

    This problem started all of a sudden. We has similar problems when we first
    got it (shifting issues), and the O2 sensor was replaced at the dealer, and
    it was Ok after that.

    I'm lost for what this could be.

    Dustin.
     
    Dustin H via CarKB.com, Aug 18, 2005
    #1
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  2. Dustin H via CarKB.com

    hyundaitech Guest

    If you're out of warranty, you may wish to hang a throttle position sensor
    and see if all your troubles disappear.

    There are also technical service bulletins about reprogramming for poor
    acceleration and stumble when cold.
     
    hyundaitech, Aug 18, 2005
    #2
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  3. Thanks for your reply!

    It's a leased car, and i've been doing regular oil changes, but haven't done
    the other yearly checkups. (So not sure about the waranty)
    It's at the end of the lease though, and i'm trying to get this fixed before
    i have to return it. (in 15 days)

    I will look into a tps sensor, as it's easy and cheap to replace.

    Any other thoughts are still welcome :)

    Dustin.
     
    Dustin H via CarKB.com, Aug 18, 2005
    #3
  4. Dustin H via CarKB.com

    hyundaitech Guest

    The warranty is 5 years/60k miles in the U.S. But if it's a lease car
    you're returning in a few days, I really wouldn't be that worried about
    it. It doesn't sound like something terribly obvious is going on,
    especially considering it's been looked at and nothing was found wrong.
     
    hyundaitech, Aug 19, 2005
    #4
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