Question about 2004 Renault 181

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Engine revs itself when sat idle

When sat still the car revs itself like someone keeps tapping the accelerator,, imtrying to sort this out as it has recently failed its mot, with high emissions, and wondered if this had anything to do with that , any help gratefully recieved,
car is a 2002 renault megane scenic 1.4

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  • j22la11 Nov 24, 2008

    yes was put on diagnostic machine today,

    came up with

    manifold air pressure sensor

    absolute pressure sensor

    202 cat error



    but no one seemed sure if this was definat or not so in limbo at mo,

    already paid 100 today, n was told that to sort this would be 125 and might not even sort it

  • j22la11 Nov 24, 2008

    it passed the rpm

    hc

    lambda

    failed on co

  • j22la11 Nov 26, 2008

    co reading was

    fast idle test 0.593

    2nd fast idle test 0.660

    natural idle test 3.064



  • artoday Nov 26, 2008

    2001 model, started reving its self, whilst I was driving, I had to keep my foot close to the brake and in low gear!!!??? Still reving in neutral

  • Anonymous Mar 12, 2014

    When you start it most times you have to try and try again because it's like the revs aren't high enough, but now the revs won't turn down as soon as you turn it on now the revs go sky high so you cannot drive it as it feels like the car is driving itself. When in gear the revs are high but not as high and as soon as you take it out of gear or go from second gear to first it over revs

  • Anonymous Mar 12, 2014

    When I first started the car it would take a few attempts to get it started as it seemed that there wasn't enough rev to start , now when I turn the key it over revs like it wants to drive itself, when you take it from second gear to first the revs go sky high and when you stop and take it out of gear it over revs

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  • 345 Answers

Bet it failed on lambda reading...........sounds like you got an air leak somewhere ! or could be an idle control valve problem,have you had it plugged into any diagnostic equipment yet ?

Posted on Nov 24, 2008

  • colin white Nov 25, 2008

    what was the co reading ?

  • colin white Nov 26, 2008

    check the coolant temp sender when they go t...ts up that can put the co out you may have a damaged cat too but they normally take out 1/2 a percent which would bring your fasr idle within spec but you need to sort your idle out first then i think the rest will come right..

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contact me if you have any questions
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