stumble when first start driving cold

Discussion in 'General Motoring' started by kr, Oct 8, 2006.

  1. kr

    kr Guest

    2002 XG350L with 42,000 miles has stumble when first strarting
    driving. Car starts fine, revs up, idle drops down then I put it in
    gear to drive. Car starts to bog as if it is going to die then takes
    off. This is every day lately. Once warmed up runs fine.

    I have tried a bottle of CHevron's Techron but did not help.

    Any ideas HyundaiTech?
    kr, Oct 8, 2006
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  2. kr

    hyundaitech Guest

    Dunno. If you've got a check engine lamp, you should start there.

    But I'm presuming you don't. Try reinitializing the throttle: Turn the
    key on (don't start the car) and back off immediately and wait ten
    seconds. Your throttle will do a sweep.

    Also do an idle learn. Start the car with the a/c on and let it reach
    operating temperature. Let it run for 10 more minutes. Then turn the a/c
    off and let it run for another ten minutes.
    hyundaitech, Oct 8, 2006
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  3. kr

    Matt Whiting Guest

    Is there any indication that the throttle sweep has been completed? Is
    there a beep or any dashboard light indication?

    Matt Whiting, Oct 9, 2006
  4. kr

    kr Guest

    Idle learn? Never heard of that. I did try the sweep but it didn't
    help. With the idle learn I just leave it idling the whole time?
    kr, Oct 9, 2006
  5. kr

    hyundaitech Guest

    Unfortunately, no. The only way you'd know for certain is to have someone
    listen or watch under the hood while you try to make it happen.
    hyundaitech, Oct 9, 2006
  6. kr

    hyundaitech Guest

    Yep, just leave it idling. It'll watch and learn where it needs to leave
    the throttle plate for proper idle rpm.
    hyundaitech, Oct 9, 2006
  7. kr

    kr Guest

    Is it safe to clean the throttle plate with cleaner? Engine running or

    I know a lot of cars can be harmed if this is not done properly (ruin
    O2 sensors, remove coatings, set trouble codes, etc).

    Also, thanks for all the assistance on here. Your feedback and advice
    is invaluable!
    kr, Oct 11, 2006
  8. kr

    hyundaitech Guest

    It's okay to clean the throttle plate with carb cleaner (while not
    hyundaitech, Oct 12, 2006
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