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Wandering 308 idle

Discussion in 'Technical Q&A' started by ejpoulsen, Mar 18, 2005.

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  1. ejpoulsen

    ejpoulsen Karting

    Dec 19, 2004
    110
    California
    #1 ejpoulsen, Mar 18, 2005
    On my '75 308 gt4 I set the idle screws to hold idle at about 900-1000 rpm. But sometimes the idle will not come down when I stop and take the foot off the pedal. The idle hovers at 2000 rpm, then wanders +/- 1000 rpm

    Suggestions?
     
  2. f355spider

    f355spider F1 World Champ
    Owner Rossa Subscribed

    May 29, 2001
    18,059
    USA
    #2 f355spider, Mar 18, 2005

    Check your driver's side floor mat. It may be sliding around, and pushing against the gas pedal. Both my 308 and 328 had this problem. To be sure, remove the mat, and go for a drive. If that is the problem, some velcro tape will fix it.

    Dave
     
  3. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    27,016
    30°30'40" N 97°35'41" W (Texas)
    Full Name:
    Steve Magnusson
    #3 Steve Magnusson, Mar 18, 2005
    If it's not from "carpet cruise control", a possible next step is to put a timing light on it and observe the advance mechanism(s) behavior(s) -- just something easy to rule in or out without any disassembly required...

    Do you have a functioning R1/R2 point set-up (i.e., a stock US setup -- I'm not quite sure where "Clovis" is ;))? If so, another thing to check is that the paddle on the throttle plate linkage is doing a reasonable job of closing the microswitch on the 1/2 carb at the idle position (but problems here would show up in the test above as well).
     

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