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Hunting Idle

Discussion in 'Technical Q&A' started by Jagbuff, Mar 17, 2011.

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  1. Jagbuff

    Jagbuff Formula 3

    Jan 13, 2004
    2,267
    Site of US F1 Race!
    Full Name:
    Franck
    #1 Jagbuff, Mar 17, 2011
    I have a 360CS with a hunting idle issue which I am trying to resolve.
    On cold start up the car idle is stable at around 1100 rpm. After warm up, i.e. 3-5 mins, the idle will start cycling/hunting between 1000 -1200 rpm at 2-3 sec interval. Occasionally, the idle will creep up to 1800 rpm and stay there unless I blip the throttle. I have cleaned the MAF but that doesn’t appear to have made any difference,
    In addition, I am trying to track down a random misfire code for cylinder 1 and 8 which is triggering the CEL, I “checked” the intake gaskets (tried the WD40 trick) but again difference.

    Any suggestions?
    THX
     
  2. Peter

    Peter F1 Veteran
    Owner

    Dec 21, 2000
    6,441
    B.C., Canada
    #2 Peter, Mar 17, 2011
    Intermittent operation (or poor connection) of an O2 sensor?...
     
  3. tazandjan

    tazandjan Three Time F1 World Champ
    Lifetime Rossa Owner

    Jul 19, 2008
    39,316
    Clarksville, Tennessee
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    Terry H Phillips
    #3 tazandjan, Mar 17, 2011
    Frenchie- Could also be a vacuum leak.

    Taz
    Terry Phillips
     
  4. fatbillybob

    fatbillybob Two Time F1 World Champ
    Consultant Owner

    Aug 10, 2002
    29,261
    socal
    #4 fatbillybob, Mar 17, 2011
    G-O-L-D P-I-N-S! See http://www.scuderiarampanteinnovations.com/
    I think that any good ghost busting has to start here.

    Did you check for out of spec injectors? I think every major service should include sending the injectors out to be cleaned and flowed. Check out Mr. Injector in idaho.
     
  5. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    26,932
    30°30'40" N 97°35'41" W (Texas)
    Full Name:
    Steve Magnusson
    #5 Steve Magnusson, Mar 17, 2011
    Get the TR back -- zing!
     
  6. Jagbuff

    Jagbuff Formula 3

    Jan 13, 2004
    2,267
    Site of US F1 Race!
    Full Name:
    Franck
    #6 Jagbuff, Mar 18, 2011
    ...been there, done that, bought the T-shirt and the action figurines ;) off to a new adventure!
     
  7. pippo

    pippo Formula 3

    Sep 25, 2005
    1,913
    FL
    Full Name:
    pippopotemus
    #7 pippo, Mar 19, 2011
    right. also, not sure if your car has one or not, but pcv valve being stuck is classic for hunting idle. easy to check /clean. I look for vac leaks by sound- a 3/16 or so ID tubing, one end in my ear, the other going around vac line connections etc. when you find a leak, man, you will hear the hisssssssssss
     

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