In what order are these to be performed? AC and ISC
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Cadillac Seville / Cadillac Eldorado Forum Discussion, In what order are these to be performed? AC and ISC in Past Cadillac Vehicle Discussion; OK I have these issues all of which I think are related to A bad ISC motor. I even had ...
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    In what order are these to be performed? AC and ISC

    OK I have these issues all of which I think are related to A bad ISC motor. I even had the code PO30...ISC slow or inoperable.

    Recently, I had the "Refrigerant Low....AC off message" with the accompanying code AO47.

    I have a new ISC to install and a can of refrigerant to recharge the system but...

    ...for the AC to be recharged the engine has to be running, and for the ISC when it is replaced it has to be relearned. The relearn procedure though, requires that the AC to be on for a part of it.

    As things start right now, if I get the car to start the idle speed in Park is 1000 rpm or greater, when in Drive foot on the break it falls slightly to 8/900 rpm.

    So how should I approach this?

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    Re: In what order are these to be performed? AC and ISC

    do the AC first -

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    Re: In what order are these to be performed? AC and ISC

    even with the out of whack rpm? How would that affect the AC recharge?

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    Re: In what order are these to be performed? AC and ISC

    when charging/checking the AC - you want a high idle - between 1000 and 1500 RPM

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    Re: In what order are these to be performed? AC and ISC

    The ISC was delivered today, I did know that I would have to install that bolt on the plunger. So the new question is: how much or how deep to thread that bolt so that I can avoid having to do any adjusting?

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    Re: In what order are these to be performed? AC and ISC

    You have to adjust it. Press on the plunger til it retracts. When it bottoms out, unplug it. Now set the gap to .030. Then plug it back in.

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    Re: In what order are these to be performed? AC and ISC

    This gap of 0.30 ....between which to points?

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    Re: In what order are these to be performed? AC and ISC

    .030, not .30. The gap is between the plunger and the throttle lever it contacts.

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    Re: In what order are these to be performed? AC and ISC

    Oh yea...I caught that typo too....
    so, I install the ISC unto the bracket before I thread the plunger bolt?

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    Re: In what order are these to be performed? AC and ISC

    Yes, install it as it was before you removed it (ready to drive). Then do the adjustment.

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    Re: In what order are these to be performed? AC and ISC

    pardon my ignorance here, but how much to thread that bolt initially? I 've got it in my hand right now, and that bolt does not go very much(by hand) just about 3 revs.

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    Re: In what order are these to be performed? AC and ISC

    I'd thread it in all the way and then see if the engine will start like that. Then retract it and adjust it.

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    Re: In what order are these to be performed? AC and ISC

    OK will give it a go....appreciate the assistance.

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    Re: In what order are these to be performed? AC and ISC

    ok I got both items done today...AC took all of a 12oz can of refrigerant and is cool again. Replaced the ISC motor and set the gap according to the above guidelines. Everything seems good so far. It idles at approx 6/700 rpm in P or D smooth and steady. When it is first strarted though, the rpms are as much as 1000 for a bit....then it gradually drops to 6/700.

    I took it out on a short ride, but was disappointed with the fuel consumption. Used 1.6 gallons over 28 miles at 70 mph? Plugs, wires, fuel and air filters are newly replaced. I think something is still amiss. This car used to average 22/3 mpg on the DIC, these days it is 19.8/20. What might I be overlooking?

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    Re: In what order are these to be performed? AC and ISC

    When it is first strarted though, the rpms are as much as 1000 for a bit....then if gradually drops to 6/700.
    As it should be.

    I took it out on a short ride, but was disappointed with the fuel consumption. Used 1.6 gallons over 28 miles at 70 mph? Plugs, wires, fuel and air filters are newly replaced. I0 think something is still amiss. This car used to average 22/3 mpg on the DIC, these days it is 19.8/20. What might I be overlooking?
    Leaky FPR?

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