Need Advise on ISC Adjustment

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HT4100 4.1, 4.5, 4.9 Discussion, Need Advise on ISC Adjustment in Cadillac Engine Technical Discussion; Hey all, My ISC motor died yesterday and I was just wondering - can I just adjust the screw on ...
  1. #1
    2dfx's Avatar
    2dfx is offline Cadillac Owners Fanatic
    Automobile(s): 2003 Cadillac DeVille
    Join Date
    Jun 2003
    Ontario, Canada

    Need Advise on ISC Adjustment

    Hey all,

    My ISC motor died yesterday and I was just wondering - can I just adjust the screw on the piston to match the old ISC motor? I went through my haynes manual and found you had to get a tach, apply 12V to one of the terminals to retract it, etc. blah! Way too complicated and I don't want to spend like 70 bucks on a tach!

    Is there an easier way to do this?

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  3. #2
    Katshot's Avatar
    Katshot is offline Cadillac Owners Master
    Join Date
    Jan 2003
    Newtown, PA

    Re: Need Advise on ISC Adjustment

    It's called "min-air adjust" and if you don't do it, the idle and off-idle performance will be questionable at best. You may also see some check engine lights and codes. If you need the procedure, let me know.

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