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Hi Jordan,
I won't be around tomorrow to follow up, but just a few thoughts about your 64 Sedan DeVille. After rebuilding the crankshaft and eliminating the heat riser and taking care of the intake manifold, how old is the carburetor and or gas? Mine was also dormant for 30 years. If you have a Rochester 4 Barrel, does it have the two small mixture screws in front, along with the much bigger idle screw in the left rear of the carburetor? I only ask because that large idle screw in the rear is key to it idling properly. If you get no reaction to turning the screw in or out, the vacuum underneath the carburetor might be clogged from the PCV hose/plastic plate. Someone put an improper top carburetor gasket on my 64 and it blocked the hole for the vacuum for that idle screw. There has to be a small triangular cut out specifically for that top gasket for that carburetor. Once the fast idle kicks down and choke is open, the large screw is adjusted first (turning counterclockwise increases the idle). Subsequent to that, adjust the two mixture screws. Just some thoughts?
Yours truly,
Dennis DiBari
Cottekill, NY
Jordan,
One last thought. How is the fuel pump on your Caddy? If it is lagging, t hen the idle will be erratic as well.
Dennis DiBari
A contributing item might be our nemesis...modern gas with ethanol. It can add to a the tendency for older cars to idle rough (especially when hot) and vapor lock. My first trouble shooting fix is to install an elective helper pump near the gas tank.
Then, make sure all your fuel lines are away from contact with great sources, and wrap the metal lines with insulation material.
Third, try to find a station with pure gasoline.
Let us know what fixed your problem.
Jordan,
C. Van Tune makes a salient point with the gasoline issue. Here in NY, we have one gas station that carries 91 octane NON-ETHANOL gasoline. This is the only gas I put in my 64 Caddy. I also add an octane booster and Marvel Mystery oil at times to keep it smooth.
Dennis DiBari
Started by Mack in 1963/64 Cadillac Specific Discussion. Last reply by Mack 12 hours ago. 2 Replies 0 Likes
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My car lacks the mechanism or spring needed to hold the jack in the storage slot on the right side of the trunk. Anyone have a picture of the item I should find?Continue
Started by Phillip Hill in 1963/64 Cadillac Specific Discussion. Last reply by Dennis P. DiBari yesterday. 6 Replies 0 Likes
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Posted by SK on June 2, 2025 at 2:20pm 2 Comments 0 Likes
Could someone post front and back photos of the 1963 right-hand kick panel with A/C?
My car didn’t come with the original kick panels, so it's a bit of a mystery to me how I should cut the backing board and carpet to fit around the A/C.
Many thanks,
-Samu
Posted by Chase on March 12, 2025 at 2:05pm 14 Comments 1 Like
Hey guys,
I have installed the same Edelbrock carb and have done everything the same as Jason’s carb and intake project. In the spring and summer months the car starts, runs and idles great! In the fall and winter months on a cold start, the car starts awful and wants to die until it warms up. I have to keep my foot on the throttle until it warms up or it will idle just terrible and try to die. Once it’s warm, it runs fantastic! Whats going on here? I was thinking of removing the…
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I bought this seat material thinking that it’s…
July 20, 2025 from 8pm to 9:30pm – Zoom
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