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Crazy RPM

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  • Crazy RPM

    I have a NA. When the engine is cool, the RPM stays just below 1, which is fine. But after a while, when the engine is hot, the RPM are from 1.5 to 2.5. Shouldn't be the other way around? :(

  • #2
    Odd...

    Welcome though, be sure to post an intro here:

    http://www.mx5atlanta.com/forums/showthread.php?t=3

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    • #3
      Your water thermistor may be bad. Also the idle air control valve may be wonky.
      sigpic

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      • #4
        but if that was the case, then shouldnt it do that all the time? not just when the engine warms up? right?

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        • #5
          nope, the idle air control, or IAC is supposed to close and restrict the air a little once your car warms up.
          sigpic

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          • #6
            May be a good time to hit the throttle body with some induction cleaner.

            Originally posted by miata5620
            Eric's Garage ... You buy all the parts I tell you to and you will have a killer car... If you want other parts used your car will suck and it will cost you more...

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