'84 Commercial Chasis Quadrajet dies at idle when warm.
Cadillac
 

Cadillac Forums | Help Us Help You | Advertise | Cadillac Parts | Cadillac News | Cadillac Classifieds / (Old System)

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

CadillacForums.com is the premier Cadillac Forum on the internet. Registered Users do not see the above ads.
+ Reply to Thread
Results 1 to 4 of 4
500, 472, 425, 368 Discussion, '84 Commercial Chasis Quadrajet dies at idle when warm. in Cadillac Engine Technical Discussion; I have found a couple of suggestions ref solving this problem but no real precise solutions. The carb absolutely dumps ...
  1. #1
    spawnhero9 is offline Cadillac Owners Member
    Automobile(s): 1984 Commercial Chasis Fleetwood S&S Hearse, 1996 DeVille
    Join Date
    Apr 2012
    Posts
    2

    '84 Commercial Chasis Quadrajet dies at idle when warm.

    I have found a couple of suggestions ref solving this problem but no real precise solutions. The carb absolutely dumps fuel once it gets hot (the engine and the temp outside). When it gets like this the only way to keep it running is to feather the accelerator constantly. Starting it back up after it dies or is shut off is the same as starting with it fully flooded. I need to figure out why it runs soooo rich. Yes it is a stock Quadrajet on a 368ci Cadillac and in cold/cool weather short trips it runs amazingly. I have looked into the common leaning adjustments and none have helped. If anyone can tell me what parts/pieces could be making the carb dump fuel I would love to know and try to get it fixed.

    Thanks.

  2. Remove Advertisements
    CadillacForums.com
    Advertisements
     

  3. #2
    Roadmaster75's Avatar
    Roadmaster75 is offline Cadillac Owners Member
    Automobile(s): 1978 Eldorado Biarritz
    Join Date
    Feb 2012
    Location
    Illinois
    Posts
    51

    Re: '84 Commercial Chasis Quadrajet dies at idle when warm.

    Sounds like a stuck float ... or,

    a compromised needle and seat ...
    either way they are a tag team ( connected to each other
    inside the carb. )

    You can spend a nice Sunday morning with a quality re-build kit and
    rebuild the Quadrajet with out any special tools. Also give you a chance to clean out all
    the accumulated gook inside.
    I get my Quadrajet kits from
    "QuadraJetParts.com" Great parts and quick shipping.

    It is not rocket science, but just takes some patience and common sense in
    dis-assembly and assembly. Take some good digital close ups.... It can help
    when it comes time to put her all back together!
    THose Holleys and Edelbrocks are nice, but for $40 or so, you can make a
    QuadraJet work just as good as new and save $300-$400!

  4. #3
    spawnhero9 is offline Cadillac Owners Member
    Automobile(s): 1984 Commercial Chasis Fleetwood S&S Hearse, 1996 DeVille
    Join Date
    Apr 2012
    Posts
    2

    Re: '84 Commercial Chasis Quadrajet dies at idle when warm.

    Thank you. This gives me something new to try and an obvious learning experience.

    Thank you again.

  5. #4
    carnut is offline Cadillac Owners Master
    Automobile(s): 1988 Allante' (sold), 1984 Eldorado, 84 Sedan DeVille
    Join Date
    Feb 2003
    Location
    california
    Age
    67
    Posts
    5,888

    Re: '84 Commercial Chasis Quadrajet dies at idle when warm.

    Sorry for the late response, but if the float is black plastic, not brass, it can absorb fuel and become heavy over time. If its too heavy it will sink in the fuel well and cause a rich/ flooding condition. Either a new plastic float or find a brass one will fix the issue.

Quick Reply Quick Reply

Register Now

Please enter the name by which you would like to log-in and be known on this site.
If you do not want to register, fill this field only and the name will be used as user name for your post.

Please enter a password for your user account. Note that passwords are case-sensitive.

Please enter a valid email address for yourself.

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Bookmarks

Cadillac Posting Rules

  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts
Read about Lincoln | Buick | Kia Forte Forum
Need products for your Cadillac? Check out your options at the links below:

custom floor mats | Cadillac Chrome and Black Chrome Wheels | window tinting