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Adjusting Neutral Idle Automatic

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  • Adjusting Neutral Idle Automatic

    I've moved the little screw a few times, but it only seems to adjust the idle WHEN IN GEAR. I've messed with the fuel/air before, too.. but I can't seem to make the neutral idle speed go down any. It is currently about 1700RPM. Same as in park.

    I suppose this is probably normal, although.. I've been doing what I probably shouldn't; shifting into N when going down hills, closely behind semis, ect. I always heard this could damage an auto, but I've seen MPG improve from 33MPG average (summer), to 39.5 last 5 gallons (from empty to empty, 196 miles GPS, NEVER had it that high).

    I have a dying starter, so I can't really EOC (engine-off coast).

    Anyone know how to set it lower, like 1000-1100ish? Or is that even safe/possible?

    -Joe
    White '92 GL 5-speed BP, G series, Aspire/Rio swapped, "Nancy"
    White '89 LX 5-speed, Aspire swapped, Weber carb
    1988 LX 5-speed
    ​​​1993 L 5-speed B8, E series, Aspire/Rio swapped

    Gone:

    1986 Chevrolet Sprint 1990 L Plus Auto

  • #2
    make sure you don't have an air leak at the IAC first, just take the idle set screw and put it in all the way. did the idle change? yes: you're good to go. NO: you have a stuck IAC.
    Trees aren't kind to me...

    currently: 2 88Ls (Scrappy and Jersey), 88LX, 90L(Pepe), 91L, 91GL (Skippy) 93 GL Sport (the Mighty Favakk), 94 (Bruce) & 95 Aspire SEs, 97 Aspire (The Joker),
    94 Justy 4WD, 87 Fiero GT, plus 2 parts cars. That's my fleet.

    Comment


    • #3
      ^Okay, thanks. I'll try during lunch tomorrow and see what's up. I haven't tried adjusting it in a while.

      -Joe
      White '92 GL 5-speed BP, G series, Aspire/Rio swapped, "Nancy"
      White '89 LX 5-speed, Aspire swapped, Weber carb
      1988 LX 5-speed
      ​​​1993 L 5-speed B8, E series, Aspire/Rio swapped

      Gone:

      1986 Chevrolet Sprint 1990 L Plus Auto

      Comment


      • #4
        If that doesn't work you may have a worn throttle body or something else allowing extra air in.
        Reflex paint by Langeman...Lifted...Tow Rig

        Comment


        • #5
          Yeah, I'm dumb. Turned the wrong screw last time. >_<

          Yay for 1000 beautiful RPM. That's gotta raise MPG a bit by itself. I've had high idle for 35k miles LOL.

          Thanks!

          -Joe
          White '92 GL 5-speed BP, G series, Aspire/Rio swapped, "Nancy"
          White '89 LX 5-speed, Aspire swapped, Weber carb
          1988 LX 5-speed
          ​​​1993 L 5-speed B8, E series, Aspire/Rio swapped

          Gone:

          1986 Chevrolet Sprint 1990 L Plus Auto

          Comment


          • #6
            idle in neutral should be ~900, and 650-700 in gear. (with engine up to temp)
            Trees aren't kind to me...

            currently: 2 88Ls (Scrappy and Jersey), 88LX, 90L(Pepe), 91L, 91GL (Skippy) 93 GL Sport (the Mighty Favakk), 94 (Bruce) & 95 Aspire SEs, 97 Aspire (The Joker),
            94 Justy 4WD, 87 Fiero GT, plus 2 parts cars. That's my fleet.

            Comment

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