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High Idle revisited

Discussion in '80-Series Tech' started by bkgiii, Nov 7, 2003.

  1. bkgiii

    bkgiii SILVER Star

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    SOrry to bug y'all again..thought I found the source of this problem but apparently not.

    Recently, (within last 4 weeks), at startup in the mornings, I noticed high idle (around 1800-2000), gradually coming down to around 1200. I cleaned linkage, and it somewhat corrected the problem (Somewhat meaning startup idle @ 1500, dropping to about 1000 after a minute).

    HOWEVER...it's back. Idle at morning startup (or after sitting / cooling off for 3-4 hours), idle is back at around 2000, stays there for several minutes, reduces when I 'pop it', then drops to 1300-1400 until I get in gear for a mile or two.

    (a) is this a 'problem'?;
    (b) if (a)='true', then what's the source;
    (c) fix?

    Thanks in advance..
     
  2. DanKunz

    DanKunz SILVER Star

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    Read about the 0-ring fix...probably should consider throttle body sticking as well.

    Sounds to me like something is sticking...normal to high idle, not normal to stay up there.
     
  3. bkgiii

    bkgiii SILVER Star

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    Thanks Dan...searching now...
     
  4. bkgiii

    bkgiii SILVER Star

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    Found the thread, Dan, thanks. Appears to be something so remedial that even I can attempt it. I do like Kurt's suggested alternative, though (read: turn up radio).
     
  5. semlin

    semlin discouraged user

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    For point of reference, mine starts at 1800 rpm and takes 90 seconds in a warm parking garage to drop to 1100 rpm. A little over 3 minutes on a cold day outside.
     
  6. Beast II

    Beast II

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    This is probably too obvious, but if you're using high octane gasoline instead of regular, you'll experience this. I had a similar problem.
     
  7. semlin

    semlin discouraged user

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    nope, regular only
     
  8. Zander8it

    Zander8it

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    Seems to me if 90% of us experience this high idle "problem" it probably isn't one. Mine sounds like a Hurricane when I crank it up in the AM. 3 minutes later when I go back to the garage it's purrin'.
    For those without garages, I like the loud radio idea.
     
  9. sjcruiser

    sjcruiser

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    Might sound irrelevant, but from your description...Have you check for vacuum leak (cracked hose) after the AFM ?
     
  10. cruiserdan

    cruiserdan SupportingVendor Emeritus Moderator

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    Check for a binding throttle cable as well. A throttle "blip" won't generaly change the iac but would get a sticky cable or throttle plate moving.
     
  11. IdahoDoug

    IdahoDoug

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    Beast,

    I can't imagine how fuel octane would impact this?

    Doug