Renault Scenic, 2001 slow to start sometimes?
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Thread: Renault Scenic, 2001 slow to start sometimes?

  1. #1
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    Default Renault Scenic, 2001 slow to start sometimes?

    Renault Scenic, 2001 slow to start sometimes?

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    It starts perfectly sometimes just turn the key, other times you have to turn the ignition off and re-start a couple times but it does start.

    The car runs fine and once going there is no abnormal running.

    What is causing this and how do i fix?

  2. #2
    1000+ Posts jo proffi's Avatar
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    We probably need more info….Is the starter labouring or is it possibly fuel starvation???

    Jo

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    COL
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    I would say clean the TDC sensor and see how you go.
    Regards Col

    1973 Renault R12 Station Wagon
    1976 Renault R12 Station Wagon
    2002 Renault Laguna V6
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    TDC sensor could be it.
    What other cars have the same sensor, any Peugeot cars?
    Starter perfect, not changed fuel filter which I should do.
    Wonder if the key battery can cause this?

  5. #5
    COL
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    Quote Originally Posted by Berridale View Post
    TDC sensor could be it.
    What other cars have the same sensor, any Peugeot cars?
    Starter perfect, not changed fuel filter which I should do.
    Wonder if the key battery can cause this?
    The battery in the key will not cause this problem. The battery is only there to operate the keyless entry function.
    Berridale likes this.
    Regards Col

    1973 Renault R12 Station Wagon
    1976 Renault R12 Station Wagon
    2002 Renault Laguna V6
    1973 Alpine A110

    http://alpine-a110.weebly.com/

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    Col,
    no relationship between transponder battery and the sensor ring around the ignition switch?

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    COL
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    Quote Originally Posted by Berridale View Post
    Col,
    no relationship between transponder battery and the sensor ring around the ignition switch?
    There is a RFID chip in the key that does the security bit.The sensor ring detects the chip and if valid will allow the engine to start.

    The chip gets its power from the sensor ring, the RFID chip is not powered by the battery in the key.
    Berridale likes this.
    Regards Col

    1973 Renault R12 Station Wagon
    1976 Renault R12 Station Wagon
    2002 Renault Laguna V6
    1973 Alpine A110

    http://alpine-a110.weebly.com/

  8. #8
    1000+ Posts REN TIN TIN's Avatar
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    First option, TDC sensor dirty as mentioned above.

    Second option, air leak from throttle-body seal.
    The rubber seal goes hard with age and doesn't make a perfect seal letting in air.
    The mixture is very lean and as the seal is after the MAP sensor the EMC doesn't know.
    As the throttle-body heats up it expands slightly sealing it off again so is usually fine when the motor is warm.

    After that, then one can look at the myriad of sensors AMP, Temperature, Oxygen, etc.
    "I cannot help but notice that there is no problem between us that cannot be solved by your departure. Mark Twain"

  9. #9
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    I took the TDC sensor out and found it with debris on the sensor head.
    This was pleasing.
    After cleaning the head the car starts without issue.
    JohnW likes this.

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