How do you clean 4.5 throttle body?
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HT4100 4.1, 4.5, 4.9 Discussion, How do you clean 4.5 throttle body? in Cadillac Engine Technical Discussion; My 1990 Deville has 260,000 km on it and it's not running as smooth as it did. How do you ...
  1. #1
    wjsdunning is offline Cadillac Owners Member
    Automobile(s): 2005 Escalade 1997 Concours
    Join Date
    Nov 2003
    Posts
    28

    How do you clean 4.5 throttle body?

    My 1990 Deville has 260,000 km on it and it's not running as smooth as it did. How do you clean out the tubes in the throttle body and get rid of the carbon. What spray is the best to use? What are the tubes in the throttle body called and what do they do? Mine are almost totally plugged.

    Thanks for the help
    Wendell

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  3. #2
    behind-bars is offline Cadillac Owners Connoisseur
    Automobile(s): 93 Sedan Deville 4.9L
    Join Date
    Sep 2005
    Location
    Texas
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    Re: How do you clean 4.5 throttle body?

    Quote Originally Posted by wjsdunning View Post
    My 1990 Deville has 260,000 km on it and it's not running as smooth as it did. How do you clean out the tubes in the throttle body and get rid of the carbon. What spray is the best to use? What are the tubes in the throttle body called and what do they do? Mine are almost totally plugged.

    Thanks for the help
    Wendell
    Hold the 2 butterfly blades open with the engine off, (eitter hold the gas pedal down or move teh throttle linkage by hand and hold it open.)Get a stiff wire (coat hanger) and then spray any make of carb cleaner, throttle body cleaner etc.. down into teh holes and use the metal hanger to break the carbon loose, just let it fall down and it will burn off next time you start the car


    The tubes are called the egr stack tubes, not sure how to explain their function though.

    While you have the carb cleaner also use a toothbrush to clean the butterfly blades throughly. Be accurate with the spray and dont get it on anything else nearby.

  4. #3
    wjsdunning is offline Cadillac Owners Member
    Automobile(s): 2005 Escalade 1997 Concours
    Join Date
    Nov 2003
    Posts
    28

    Re: How do you clean 4.5 throttle body?

    Thanks for the info

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