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Thread: engine start only with accelerator

  1. #1
    gino9's Avatar
    gino9 is offline Cadillac Owners Fanatic
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    engine start only with accelerator

    Engine have problem with start,only start with acclerator.if not acclerated engine rotated,started and stopped.now i clear codes 027.any idea what is to check?


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  3. #2
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: engine start only with accelerator

    Not real familiar with that engine anymore, but it is obvious that the throttle plate is not being held open, thus choking off the air intake. It's an idle speed adjustment. Just not sure how that engine does it. Standby, someone will chime in.

  4. #3
    Crudsturbo is offline Cadillac Owners Fanatic
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    Re: engine start only with accelerator

    Doesnt that car still have some type of IAC? I know it at least has an eltric carb on it if not tbi.

  5. #4
    Ranger's Avatar
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    Re: engine start only with accelerator

    Not sure how the idle is controlled on that one (set screw, ISC motor, solenoid). Been a long time since I've seen one.

  6. #5
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    The 4.5 uses an ISC motor.

  7. #6
    Rixky-D is offline Cadillac Owners Member
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    Re: engine start only with accelerator

    Cleaning the throttle body ought to be the first thing.

    ***

  8. #7
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: engine start only with accelerator

    Quote Originally Posted by MoistCabbage View Post
    The 4.5 uses an ISC motor.
    Then that's the problem. Either it is inop or out of adjustment.


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