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Mazda astina bg series 1992 has an idling problem .It idles between 900-1500 rpm after warming up.Should cut back to around 750rpm idle speed after warming up. Could you please give me an idea what might be causing this? Thanks

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  • cockatoo18 Nov 13, 2008

    How do you know for sure if it is the idle air motor?What about the pcm controlling the idle air motor or something else?Have replaced the idle air motor already.

    Have you any more IDEAS what's causing the prob.Several mechanic's including a con mazda dealership haven't had any luck yet.

    Thanks

  • Anonymous Mar 17, 2014

    i touched a battry powered test light to one of the electrcal circuts.

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The idle air motor in the throttle body is probably not working right it lets more air in the intake when its cold and is supposed to shut off when it warms up if its not shuttin off then it is probably not closing

Posted on Nov 13, 2008

  • Walter Morris Nov 13, 2008

    then there could be a pcm problem it could have a short in it. it could possibly be the engine temp sensor seeing as the idle air motor is supposed to open and close according to engine temp to aid in cold starting and running. if the engine temp sensor is fine then you might see if you can find another pcm you can swap out and see if that fixes the problem. you might also look into a vacuume leak or a bad intake gasket

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