ticking throttle
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Northstar Engines and System Technical Discussion Discussion, ticking throttle in Cadillac Engine Technical Discussion; I don't know if this has been addressed before, but I'm stumped. Sometimes(not all) when I shut off the engine ...
  1. #1
    jgreen is offline Cadillac Owners Member
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    ticking throttle

    I don't know if this has been addressed before, but I'm stumped. Sometimes(not all) when I shut off the engine in my 95 Seville the throttle cable will click several times. I can see it happening.
    No codes are set. The TP sensor at idle is .78V, throttle angle is 4 to 5 degrees. Could I have a hung up ISC valve?
    Can anyone suggest possible causes?
    Thanks

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  3. #2
    CadiJeff's Avatar
    CadiJeff is offline Cadillac Owners Connoisseur
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    Re: ticking throttle

    I think the 95 still has an idle speed control motor, try searching for that or "ISC motor"

  4. #3
    Ranger's Avatar
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    Re: ticking throttle

    ISC motor is failing.

  5. #4
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    davesdeville is offline Banned
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    Re: ticking throttle

    Mine's been doing that for about a year and a half now. ISC hasn't gone out on me yet...

  6. #5
    codewize's Avatar
    codewize is offline Cadillac Owners Master
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    Re: ticking throttle

    Yup for sure ISC. It's the little thing that look like a solenoid that the throttle rests on mounted to the throttle body. It has a threaded rod that pushes out to maintain idle if the idle drops and to produce the step up idle during cold starts.

    If you replace this your self there is a sequence you must perform to calibrate it. You can't just take old off and put new on. Also note that this part will cost you around $200, if I remember correctly.

    Both of you should be careful with this. I had mine one day all of a sudden throw WOT while I was decelerating coming into a city road. I also knew it was bad and kept letting it go. Get it fixed. You'll save a lot of gas and it'll be safer.

  7. #6
    CadiJeff's Avatar
    CadiJeff is offline Cadillac Owners Connoisseur
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    Re: ticking throttle

    $200?!?! not US dollars you suouldn't pay more than $100 at any parts source got an oem last year from dealer for $78.

  8. #7
    codewize's Avatar
    codewize is offline Cadillac Owners Master
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    Re: ticking throttle

    Really? I think the dealer charged me $180 for my 89 STS.

    Quote Originally Posted by CadiJeff
    $200?!?! not US dollars you suouldn't pay more than $100 at any parts source got an oem last year from dealer for $78.

  9. #8
    jgreen is offline Cadillac Owners Member
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    Re: ticking throttle

    Thanks for all the help guys. You're right on the money. It was the ISC motor. $65.00 at Rock Auto, on line.

  10. #9
    codewize's Avatar
    codewize is offline Cadillac Owners Master
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    Re: ticking throttle

    Sweet. I guess I paid top dollar from the dealer. Maybe that was installed? It's been a whiel so I don't really remember.

    Quote Originally Posted by jgreen
    Thanks for all the help guys. You're right on the money. It was the ISC motor. $65.00 at Rock Auto, on line.

  11. #10
    2dedge is offline Cadillac Owners Member
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    Re: ticking throttle

    What is the procedure for calibrating?

  12. #11
    codewize's Avatar
    codewize is offline Cadillac Owners Master
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    Re: ticking throttle

    Ouch, I'll have to look. It's something like at idle you push the rod back into the unit as far as it will go then you unplug it at that point. Then you turn the end in or out to get the idle to 500 RPM. They you plug it back in.

    I wouldn't trust this info until I or someone verifies it. But it's something to that effect.

    Look here

    AND

    Read this PDF

  13. #12
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    Re: ticking throttle

    Press on the plunger til it retracts. When it bottoms out, unplug it. RPM should be about 450 (maybe even stalled). Release the plunger and adjust to a .030 gap. Reinstall the electrical connector.

  14. #13
    codewize's Avatar
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    Re: ticking throttle

    Yeah yeah, that's it. I knew it was pretty easy.

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