83 4.1 overheated, now, an ISC problem ! - Page 2
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HT4100 4.1, 4.5, 4.9 Discussion, 83 4.1 overheated, now, an ISC problem ! in Cadillac Engine Technical Discussion; Humor me by bringing the car to operating temperature, climate controls in the OFF position, then shut off engine. Then ...
  1. #16
    carnut is offline Cadillac Owners Master
    Automobile(s): 1988 Allante' (sold), 1984 Eldorado, 84 Sedan DeVille
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    Re: 83 4.1 overheated, now, an ISC problem !

    Humor me by bringing the car to operating temperature, climate controls in the OFF position, then shut off engine. Then remove the ISC assembly from the throttle body leaving the wiring to it connected and restart engine. Now the car should idle very slowly. With the ISC in your hand retract the shaft by applying a constant pressure on the shaft. Once fully retracted, quickly disconnect the wiring to it. Shut off the engine. Reinstall it and verify at least a .060 gap between it and the throttle arm then reconnect wiring to it. Now restart the engine with the A/C still off. We need to know that the ISC has been adjusted before we can go further.

  2. #17
    hendrob is offline Cadillac Owners Fanatic
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    Re: 83 4.1 overheated, now, an ISC problem !

    Will do so Carnut and report back . Thanks !!!

  3. #18
    hendrob is offline Cadillac Owners Fanatic
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    Re: 83 4.1 overheated, now, an ISC problem !

    Did as you advised Carnut, when it advanced 3 clicks and snapped back I unplugged it. There is NO clearance at all with the screw on the ISC turned in all the way infact it speeds the engine up. This ISC isn't retracting properly and 3 ISCs have done the same thing. They all just wind out to the end, and keep on pushing

  4. #19
    carnut is offline Cadillac Owners Master
    Automobile(s): 1988 Allante' (sold), 1984 Eldorado, 84 Sedan DeVille
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    Re: 83 4.1 overheated, now, an ISC problem !

    Please re read my post! I said push on the shaft until it fully retracts with wiring connected, engine running. It might take 30 to 45 seconds to retract keeping constant pressure on the ISC shaft. Disconnecting it after it fully extends will not set the gap! and yes it will idle too fast. You cannt possibly have 3 faulty ISC's.

  5. #20
    hendrob is offline Cadillac Owners Fanatic
    Automobile(s): 1997 DEVILLE
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    Re: 83 4.1 overheated, now, an ISC problem !

    Understood Carnut, thats what I did, but I'll give her another shot tomorrow and report back again. Thanks again for your assistance !
    Bob

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