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Strange Intermittent Idle Fluctuation

Discussion in '3rd Gen 4Runners (1996-2002)' started by Trekker, Apr 2, 2024.

  1. Apr 2, 2024 at 9:54 AM
    #1
    Trekker

    Trekker [OP] Regular Member

    Joined:
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    Vehicle:
    1997 3rz 5spd
    Today I was sitting at a light and noticed that my idle was unusual. Instead of being around 600-700, it was bouncing between 1000-1100.

    Thats normal rpm for startup, but the engine was already warm, and it never goes up and down like it was.

    I turned off the radio and made sure nothing was on that would cause a load. It idled like this whether I was in neutral or in gear with the clutch in.

    Then within a couple minutes it stopped, and the idle went to 600 and seemed to be normal again. And I couldn’t repeat it once I got home.

    The MAF was cleaned in December. If it were a vacuum leak it shouldn’t go away. IAC maybe. Any ideas?
     
  2. Apr 2, 2024 at 10:27 AM
    #2
    negusm

    negusm New Member

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    Clean the IAC/Throttle body.

    Might be a bad IAC or TPS or MAF. Those are the main culprits.
     
  3. Apr 2, 2024 at 4:14 PM
    #3
    Trekker

    Trekker [OP] Regular Member

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    Is the IAC PN 22270-75040 correct? I'm not going to replace my IAC immediately, but at some point I should buy one since that seems like something that would get discontinued.

    Last time I saw my throttle body 5 months ago it didn't look dirty, but the IAC could be.
     
  4. Apr 3, 2024 at 6:50 AM
    #4
    negusm

    negusm New Member

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    I found for a 4cyl 97:
    Cali 22270-75051
    Fed 22270-75040
     

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