2002 Elantra won't accelerate when engine is cold and humidity is high

Discussion in 'Hyundai Elantra / Lantra' started by Ghislain, Jul 8, 2006.

  1. Ghislain

    Ghislain Guest

    When humidity is high (80% and above) and the engine is cold, our 2002
    Elantra won't accelerate properly. It hesiates for a few seconds and then
    all of a sudden it accelerates (usually 15-20 seconds after starting the
    engine). This never happens once the engine is warm or when humidity is less
    than 80%. Unfortunately the computer doesn't detect a fault. Any idea what
    could cause that behaviour?

    Ghislain, Jul 8, 2006
    1. Advertisements

  2. Ghislain

    hyundaitech Guest

    There's a reprogram available for this condition ("warm ambient cold start
    stumble"). If you're within the 8/80 emissions warranty (includes ECM),
    your dealer should be able to reprogram your ECM for free to resolve this
    hyundaitech, Jul 8, 2006
    1. Advertisements

  3. When humidity is high (80% and above) and the engine is cold, our 2002
    I've had this similar problem on my 2002 Sonata. I usually find that
    when this is happening, I run my tank close to empty, put in two
    bottles of concentrated Gumout Fuel Injector cleaner, gas up fully,
    and run the tank almost empty, it clears up. Some cars can be picky
    about gas brands too. You may also want to check on your air filter
    and air-intake chamber. Sometimes bugs, leaves, or other things are
    lodged in there and causing problems. You ought to be able to buy a
    2-pack of Gumout concentrated injector cleaner at your auto-parts
    store. Beyond that, you may want to check your plugs or wiring and
    make sure they are not picking up moisture. Good luck.

    - Thee Chicago Wolf
    Thee Chicago Wolf, Jul 11, 2006
  4. Ghislain

    Ghislain Guest

    The car only has 32,000 kms. The timing belt has been replaced after 4
    years, the air cleaner is new, the gas is the same that we use in our other
    cars, etc. I'll let the dealer figure out the issue, but TSB 04-36-004
    describes my problem.
    Ghislain, Jul 11, 2006
  5. Ghislain

    hyundaitech Guest

    If your Sonata is a 4 cyl., there's also a reprogram for your car for a
    hesitation on cold start. It's described in TSB 02-36-037.
    hyundaitech, Jul 11, 2006
  6. Ghislain

    Ghislain Guest

    I'm in Canada, therefore the ECM code isn't the same as US models. The
    service manager contacted Hyundai Canada and they told him what code to
    download. The issue has not occurred since the ECM was flashed, but the car
    now behaves sliightly different, i.e., acceleration is smoother than before.
    The service manager admitted that other customers complained about that same
    issue and that they could never totally resolve it.

    At the same time, the dealer finally resolved the rear brake noise issue.
    Whenever we drove or braked at very low speed, we heard intermittent noise
    from the left rear area. It turned out there were 2 issues: the left hub had
    to be replaced and that corrected a faily loud noise at low speed (it did it
    without braking). A new strut corrected the noise when braking at low speed.
    Replacing the wheel bearing, the drums and shoes didn't help at all, but we
    now have brand new brakes in the back for free.

    Thanks for your help.

    Ghislain, Jul 19, 2006
    1. Advertisements

Ask a Question

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.