Cadillac
 

Cadillac Forums | Help Us Help You | Advertise | Cadillac Parts | Cadillac News | Cadillac Classifieds

Cadillac Technical Archive | Cadillac Dealers | Cadillac Reviews | Cadillac Dealer Reviews | Cadillac Vendors

Results 1 to 7 of 7

Thread: 81 Deville 8-6-4 continuous fast idle

  1. #1
    kc81cadman is offline Cadillac Owners Member
    Automobile(s): 81 Sedan DeVille 8-6-4
    Join Date
    Jan 2005
    Location
    Toronto Ontario
    Posts
    20

    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.


  2. Remove Advertisements
    CadillacForums.com
    Advertisements
     

  3. #2
    Bro-Ham's Avatar
    Bro-Ham is offline Cadillac Owners Connoisseur
    Automobile(s): 1979 Sedan deVille d'Elegance
    Join Date
    Oct 2005
    Location
    Sarasota, FL
    Age
    49
    Posts
    4,152

    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
    Join Date
    Jan 2005
    Location
    Toronto Ontario
    Posts
    20

    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
    Join Date
    Jan 2005
    Location
    Toronto Ontario
    Posts
    20

    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
    Join Date
    Feb 2004
    Location
    Nerk,Ohio
    Age
    36
    Posts
    1,072

    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
    Join Date
    Feb 2005
    Location
    Southern NJ
    Age
    54
    Posts
    2,096

    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
    Join Date
    Jan 2005
    Location
    Toronto Ontario
    Posts
    20

    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.


Bookmarks

Cadillac Posting Rules

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Read about Lincoln | Buick | Kia Forte Forum