1998 Hyundai Coupe FX (Tiburon) warm start problem

Discussion in 'Hyundai Coupe / Tiburon' started by gerryo, Nov 16, 2003.

  1. gerryo

    gerryo Guest


    I have a 1998 Hyundai Coupe FX (Tiburon) with a warm start problem,
    when the car has reached operating temperature, if it is switched off,
    it will not restart until it has cooled down.

    It's the 1.6 engine version.

    This problem began happening a few weeks ago, but is really only
    noticable on multiple short journeys. On the road, it seems to run
    fine, although the idle is a little rough & it stumbles at idle

    Today, I let it warm up & noticed during the warm up phase, at one
    point it appeared to stumble, almost cut out, then recovered, then
    carried on as normal. When I switched it off, then on, it would not
    fire up.

    Cranking is fine, but there are no sparks at the plugs.

    The coil seems OK, resistance wise, the plugs were changed recently.I
    suspect some defective sensor is preventing the ECU from driving the

    I had a look at the Hyundai tech pages, nothing exactly like this
    problem, although they do say the crank sensor might be a reason for a
    no start condition. The camshaft sensor is also a potential failure

    A Google search turned up lots of starting problems, but nothing
    related to temperature.

    The car starts first time from cold, every time.
    Has anybody seen anything like this before?

    Which sensor is not critical, as one seems to cut out when hot, but
    the engine runs anyway?

    Where exactly is the ECM (ECU)located?


    gerryo, Nov 16, 2003
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  2. gerryo

    theta00k Guest

    Use chill spray to see if it's defective.
    theta00k, Nov 16, 2003
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  3. gerryo

    Phil Lacasse Guest

    exactly the same problem with my 1998 Accent!

    Phil Lacasse, Nov 17, 2003
  4. gerryo

    gerryo Guest

    It's going to the Hyundai dealers today, I'll post the results when available.

    gerryo, Nov 18, 2003
  5. gerryo

    Phil Lacasse Guest

    I'm looking forward to finding out! thanks

    Phil Lacasse, Nov 18, 2003
  6. gerryo

    Mike Behnke Guest

    Since the problem seems to be heat related, possible that the fuel is
    boiling somewhere in the fuel system near the engine, causing a vapor
    lock condition.
    Mike Behnke, Nov 18, 2003
  7. gerryo

    pookeybrain Guest

    I had exactly the same problem on my son's '94 Scoupe with the 1.5 engine.
    The coolant temperature sensor was bad.

    This was located in the thermostat housing. There were 2 sensors mounted
    there. The coolant sensor was the lower of the two.

    The car can't sense the engine is warmed up and is basically flooding the
    engine with too much gas.
    pookeybrain, Nov 18, 2003
  8. gerryo

    Phil Lacasse Guest

    in this case, did the computer store a trouble code? and did you smell gas
    when this was happening?

    Phil Lacasse, Nov 18, 2003
  9. gerryo

    pookeybrain Guest

    Yes. That's how I tracked it down. I don't remember any unusual gas smell.
    pookeybrain, Nov 19, 2003
  10. gerryo

    gerryo Guest

    Got the car back this evening, it was the crank sensor.

    Job cost Euro 177 ( approx. $210 or £124).
    Sensor cost was Euro 74 (approx. $88 or £52).

    Interesting reading on the garage report, there were no fault codes
    revealed by the diagnostics, nothing stored in the ECU.

    However, the following is from the Hyundai diagnostic trouble code

    Code Problem
    P0335 Crankshaft position sensor circuit malfunction
    Crankshaft Position Sensor

    P0336 Crankshaft position sensor circuit range

    Wonder why none of these was stored, seems like it should have been
    P0335 at least.

    gerryo, Nov 19, 2003
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