81 Deville 8-6-4 continuous fast idle
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500, 472, 425, 368 Discussion, 81 Deville 8-6-4 continuous fast idle in Cadillac Engine Technical Discussion; I need some help in determining what would make my 8-6-4 idle fast all the time. It will not kick ...
  1. #1
    kc81cadman is offline Cadillac Owners Member
    Automobile(s): 81 Sedan DeVille 8-6-4
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    81 Deville 8-6-4 continuous fast idle

    I need some help in determining what would make my 8-6-4 idle fast all the time. It will not kick down, so I suspect the the computer is getting bad signals or no signals at all. I believe it to have the quasi injection system, so it may have a solenoid to enrich fuel mixture for fast idle or a funky TPS may be at fault, dunno. If anyone is familiar with this engine and its controls, let me know.
    KC.

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  3. #2
    Bro-Ham's Avatar
    Bro-Ham is offline Cadillac Owners Connoisseur
    Automobile(s): 1979 Cadillac Sedan deVille d'Elegance
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    Re: 81 Deville 8-6-4 continuous fast idle

    Hi KC,

    Find Ape Man on this forum since he knows the V8-6-4 very well.

    Good luck!

    Dave

  4. #3
    kc81cadman is offline Cadillac Owners Member
    Automobile(s): 81 Sedan DeVille 8-6-4
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    Re: 81 Deville 8-6-4 continuous fast idle

    Thanks, I will try to PM him if possible.
    KC.

    Darn, not enough post to do a PM, I hope he reads this.

  5. #4
    kc81cadman is offline Cadillac Owners Member
    Automobile(s): 81 Sedan DeVille 8-6-4
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    Re: 81 Deville 8-6-4 continuous fast idle

    I got moved! All is better this way. Anywho, does anyone have capabilities to PM Ape Man regarding this issue of mine, it would be much appreciated. I cannot do to limited # of post's, apparently you need 50! Wo, bummer. If someone could accomodate me with an answer it would be great.
    KC.

  6. #5
    CadiJeff's Avatar
    CadiJeff is offline Cadillac Owners Connoisseur
    Automobile(s): 1981 CoupeDeville, 2 1990 Eldorados, 1994ETC ,1992STS
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    Re: 81 Deville 8-6-4 continuous fast idle

    check your idle speed control motor

  7. #6
    The Ape Man's Avatar
    The Ape Man is offline Cadillac Owners Connoisseur
    Automobile(s): '80 Fleetwood Coupe, 1994 and 1995 Mercedes 140 Coupe
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    Re: 81 Deville 8-6-4 continuous fast idle

    Look for binding linkage, vacuum leaks and check the stored ECM codes. Sometimes the ISC motor gets stuck and will cause this. Should set a code or 2.

  8. #7
    kc81cadman is offline Cadillac Owners Member
    Automobile(s): 81 Sedan DeVille 8-6-4
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    Location
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    Re: 81 Deville 8-6-4 continuous fast idle

    Thanks for the info. It is greatly appreciated. I will definetly check out the motor, which I did not even know existed till now.
    KC.

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