just put a new carb on my 69' CADI & when i start the car it stays on high idle,as if some1 putn the pedal 2 the floor

Asked by Mar 17, 2015 at 10:37 PM about the 1969 Cadillac DeVille

Question type: Car Customization

1 Answer

78,095

There's 2 idle speed adjustments on the carburetor. The curb idle speed (650 RPM) is on the driver's side of the carburetor and the fast idle speed (1500 RPM) which is on the passenger's side of the carburetor. As the engine warms up does the choke plate open? If not there's a problem with the heat riser system. There's an exhaust crossover passage in the intake manifold. Hot exhaust gasses warm the choke coil so the choke will open and come off of fast idle. There's a small passage in front of the carburetor that frequently becomes clogged. This should have been addressed when the carburetor was replaced. Originally there was also an idle speed up device tied into the Automatic Climate Control System. I'm sure the replacement carburetor is not equipped with this. The climate control system would apply vacuum to the device on the carburetor to speed up the engine to 900 RPM with the air conditioning on. HTH. - Jim

Your Answer

Cadillac DeVille Experts

  • #1
    kikero
    Reputation
    2,300
  • #2
    Js08016
    Reputation
    2,060
  • #3
    Cynthiasmith
    Reputation
    1,800
View All

Related Models For Sale

Used Cadillac Eldorado
272 listings starting at $2,495
Used Chevrolet Impala
386 Great Deals out of 25,600 listings starting at $900
Used Chevrolet Corvette
98 Great Deals out of 15,355 listings starting at $3,900
Used Chrysler 300
305 Great Deals out of 19,331 listings starting at $1,500
Used Chevrolet Caprice
128 listings starting at $1,350
Used Chevrolet Camaro
242 Great Deals out of 28,772 listings starting at $1,800
Used Lincoln Continental
32 Great Deals out of 2,821 listings starting at $21,995

Used Cars For Sale

2003 Cadillac DeVille For Sale
142 listings starting at $1,988

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.