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Ideal Idle RPM

Discussion in '308/328' started by Willis, Mar 30, 2008.

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  1. Willis

    Willis Rookie

    Nov 21, 2007
    30
    Walnut Creek, CA
    Full Name:
    Bill
    #1 Willis, Mar 30, 2008
    My 89 328 used to idle at 900 RPM before a recent light service. Now it idles at 1350 cold and 1100 hot. It seems a little high?
     
  2. Jedi

    Jedi Moderator
    Moderator Lifetime Rossa Owner

    Mar 18, 2008
    32,275
    Seattle Area
    Full Name:
    Dave
    #2 Jedi, Mar 30, 2008
    I'm certainly no expert - but my '86 328 idles at 900 after 10 minutes warming
    in the garage. Major service last August. She starts out at 1200 or so, then
    kicks down to 1000 but a little 'chuggy' - then after 10 minutes settles in at 900
    and is responsive as can be. Hopefully I'M not the one with the oddball...

    Dave
     
  3. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    26,829
    30°30'40" N 97°35'41" W (Texas)
    Full Name:
    Steve Magnusson
    #3 Steve Magnusson, Mar 30, 2008
    Nothing too horrible with those numbers -- the warm idle spec is 1000 +/- 100 RPM so you went from the low side to the high side (but your tach is essentially just an analog voltmeter so its own accuracy may not be so wonderful, and unless you've confirmed it using a digital method -- either from the ignition spark events or the RPM flywheel sensor output -- a 100 RPM difference could be the tach itself rather than a real RPM error).
     

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