Random but frequent hard/no starts - 93 Elantra

Discussion in 'Hyundai Elantra / Lantra' started by rib, Aug 7, 2005.

  1. rib

    rib Guest

    93 Elantra, 5-sp, 1.6 L

    Cold starts without complaint every morning.

    But in the normal routine of doing short park-then-go trips with
    several start/shutoff/restarts, say, while doing shopping/errands
    around town, the car won't start sometimes...unless it sits...and
    sits...and sits...for awhile. Without this nap it'll just crank and
    crank and...well, crank some more. Usually there's a gas smell too. It
    may be coincidence...or not...that it seems to happen on warm/hot days?

    Then, after sitting awhile, when it does eventually start, it trembles
    for a few seconds, and all is well again.

    I can't make the car do this on demand, however. The problem is
    predictably frequent but not predictably reproduceable.

    Appreciate any diagnostic suggestions!


    rib, Aug 7, 2005
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  2. My son's '94 Scoupe with the 1.5 had this exact problem. It was due to
    a defective coolant temperature sensor.

    When this sensor dies, the computer thinks the engine is cold and feeds
    it too much gas when cranking. The car will start fine when you first
    crank it in the morning but will leave you sitting around town in
    parking lots for 20-30 minutes until the engine cools sufficiently to
    start with the rich mixture.

    The sensor was located on the thermostat housing on the 1.5 engine.
    Screwtape iii, Aug 8, 2005
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  3. rib

    hyundaitech Guest

    You may also be interested in whether you have fuel and spark when
    hyundaitech, Aug 8, 2005
  4. rib

    Bob Guest

    Thanks, hyundaitech and Screwtape!

    But hyundaitech's reply reminds me that I neglected to mention that while
    the engine cranks and cranks, exhaust is choking out the tailpipe. When it
    finally does start, POOF! a big stinky smoke cloud, then once running
    fine. I'm also pretty sure this engine is burning some oil, having to add
    a liter after 2-3,000 kms. Uh-oh.


    Bob, Aug 11, 2005
  5. rib

    rib Guest

    Hey Screwtape! The problem turns out to be exactly the same as your
    son's '94 Scoupe, ie. a defective coolant temperature sensor.

    Problem instantly solved!


    rib, Aug 19, 2005
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