1969 Deville idle

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500, 472, 425, 368 Discussion, 1969 Deville idle in Cadillac Engine Technical Discussion; Hi problem: rough shaky idle recent fixes: rotor, cap, wires, plugs, Pertronix ignitor, coil, timing set to stock 5 BTDC. ...
  1. #1
    69DVC's Avatar
    69DVC is offline Cadillac Owners Member
    Automobile(s): Cadillac
    Join Date
    Oct 2006
    Dublin, Ireland

    1969 Deville idle


    problem: rough shaky idle

    recent fixes: rotor, cap, wires, plugs, Pertronix ignitor, coil, timing set to stock 5 BTDC. Carb seems okay, reading Doug Roe's book at the moment

    Any ideas??



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  3. #2
    cadillacdeville's Avatar
    cadillacdeville is offline Cadillac Owners Fanatic
    Join Date
    May 2004
    Longview Tx

    Re: 1969 Deville idle

    vacuume lines maybe one cracked?

  4. #3
    jk1000 is offline Cadillac Owners Member
    Join Date
    May 2004

    Re: 1969 Deville idle

    I'm thinking vacuum leak too. Check the entire pvc line especially where it connects to the carb. Often this hose cracks, but the crack is not visible because the a/c compressor is in the way.

    If no vacuum leaks are found, try advancing the timing a little and see if it helps.

    Hope this helps.

  5. #4
    BluEyes's Avatar
    BluEyes is offline Cadillac Owners Enthusiast
    Automobile(s): 1970 Sedan deVille hardtop
    Join Date
    Feb 2005

    Re: 1969 Deville idle

    Check the vacuum advanc cannister as well. Not uncommon for the vacuum diaphragm to rupture and cause a vacuum leak.

    After that, I'd check out the carb again, make sure the idle mixture is good and maybe raise the idle RPM a bit.

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