High idle on 1994 DeVille 4.9
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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, High idle on 1994 DeVille 4.9 in Past Cadillac Vehicle Discussion; Hi, My car is 1994 DeVille 4.9, last week i replaced the EGR valve, the TPS and cleaned the throttle ...
  1. #1
    dannyga is offline Cadillac Owners Member
    Join Date
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    Israel
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    High idle on 1994 DeVille 4.9

    Hi,

    My car is 1994 DeVille 4.9, last week i replaced the EGR valve, the TPS and cleaned the throttle body.
    After installing all parts, idle is very high (about 2200).
    I done the idle learn procedure (13 minutes idle and all the other...) and it didnt help.
    Also tried the TPS adjustment procedure - didnt help.
    The PD01 shows .2 while engine OFF.
    When i disconnect the TPS connector, the idle is normal but P022 code appears.

    I noticed that the high idle is because the ISC screw is pushing the throttle, i checked the ISC with the PS03 override, and it work OK,
    it goes all the way back when i press COOL until there is a gap from the trottle lever.

    I suspect the TPS, the old one (was broken while removing the EGR valve) was adjustable (PN: 06584 C-0454), the new is not adjustable (PN: KEM 141-440).

    Can you help me ?

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  3. #2
    elwesso's Avatar
    elwesso is offline Cadillac Owners Master
    Automobile(s): 2005 CTS-V, 1994 Infiniti Q45
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    Re: High idle on 1994 DeVille 4.9

    It sounds as if possibly the fast idle cam is adjusted too high.......

  4. #3
    dannyga is offline Cadillac Owners Member
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    Thread Starter
    Hi

    Where is the fast idle cam, do you mean the ISC screw ?

  5. #4
    elwesso's Avatar
    elwesso is offline Cadillac Owners Master
    Automobile(s): 2005 CTS-V, 1994 Infiniti Q45
    Join Date
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    Location
    Indiana
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    Re: High idle on 1994 DeVille 4.9

    The fast idle cam is on the throttle body..... Cant say for sure, but its gonna be near the <sorry for a lack of a better term> thing that pulls the throttle plate.....

    No, I meant the FIC screw.... But you might try adjusting out the ISC screw first.... DONT MESS WITH THE FIC!!!!!

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