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70 super bee 440, 6 pack, High idle problem

Jimclo2002

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Location
Lewes, Delaware
Hello folks need little help. I have a 440 6 pack question. Little back round,all carborators were rebuilt. Engine totally rebuilt. Now ,the engine has about 40 minutes total run time during engine break in the RPM was was around 1500 At that time the timing was at 0 degrees. So the next day I set timing at 10 BTDC . . No problems. But the RPM seem to go very high. Trying to adjust the idol on the middle carburetor? Where is that located? I backed the screw all the way up so the fast idle solenoid was it interfering. also removed the accelerator cable to make sure it was not sticking.I adjusted the timing to 10 degrees below TDC. Now the idle speed is very very very high and I can’t bring idol it down.
Any suggestions?
 
Does it have a choke and high idle cam? If so you need to ensure the choke is fully open.
 
Make sure outboard carbs are closed. (Been there, done that)
 
Here is couple of pictures
Does it have a choke and high idle cam? If so you need to ensure the choke is fully open.
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Yes don I do have the choke and high idle can

I wasn’t sure what that was

image.jpg
 
I would adjust outboard carbs to make sure they are closed. Then adjust or remove high idle solenoid so it’s not holding open center carb. Then just work on center carb til it’s correct. Then move on to outboard carbs.
 
linkage that ties the carbs together is probably tight letting one of the end carbs hang open.
 
The idle adjusting screw is where the arrow is pointing. This assumes you backed off the adj screw @ the idle solenoid. Kinda agree with lewtot184 about that linkage, looks like front carb is not fully closed (circled). So if your choke has unloaded these can be the only adjustments assuming no vacuum leaks.
help.jpg
 
Here's the idle screw on my carb (arrow).
carb.png
 
The rods that go from the center carb to the outboard carbs may be holding them open more than they should. Try adjusting the length of those a half turn at a time.
Screenshot_20190322-023627_Chrome.jpg
 
You sure your choke is unloading off the fast idle cam (arrow pointing toward it)?
help.png
 
1) remove the idle dashpot
2) disconnect both outboard carb rods.
3) start and warm up the engine
4) make sure the fast idle adjuster is not against the fast idle cam (passenger side)
5) adjust idle screw.
6) check and adjust timing
7) readjust idle screw again if necessary.

If you still have a high rpm idle condition, could be a vacuum leak.
 
^^^See Post 14
But........The first place I'd start is the throttle cable. Is it adjusted too tight?
Also, while running, you might look down the carb bores make sure ones not leaking.
 
2) disconnect both outboard carb rods.
WARNING!
Be VERY CAREFUL not to let one of those disconnected outboard carb rods get hung up as you work the throttle on the center carb!!!!
I have had one get jammed against a part of the intake manifold or something on the manifold and it will stick your center carb open at potentially high RPMs.
My recurring problem with the idle being too fast is usually related to the outboard carb throttle plate rods...It is a delicate balance between them operating freely and pushing them closed too hard or pulling the throttle plates open.
Once the Mopar 6bbl is "dialed in" it is one of the most exhilarating experiences you can have!! Almost like a turbo kicking in.
 
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I have also had the idle solenoid pop up to different heights, or it seemed like it did.
Almost every time I have an idle that is too fast though, it is related to the choke cam (beige plastic) either not fully rotating open (choke off) which affects the position of the idle speed screw relative to the throttle plate on the center carb...or the outboard carbs throttle plates being ever so slightly pulled open further than they should be.
 
I disconnected the two out board caborator rods. This seemed the fix the high idle. I want to put more time on the car before declaring the fast idle tbeing fixed

I’m having a choke issue. When engine is cold 40 degree choke butterfly it is closed.
I ran the car for 10-15 minutes.
I let the car sit off for 10 minutes
Then try to start. Did not start
I opened the carburetor butterfly (I used the vice grips to keep open
Car started up
 
I disconnected the two out board caborator rods. This seemed the fix the high idle. I want to put more time on the car before declaring the fast idle tbeing fixed

I’m having a choke issue. When engine is cold 40 degree choke butterfly it is closed.
I ran the car for 10-15 minutes.
I let the car sit off for 10 minutes
Then try to start. Did not start
I opened the carburetor butterfly (I used the vice grips to keep open
Car started up

Don't drive the car with the outboards disconnected. Adjust the rods and reattach them. Otherwise, very bad things can happen.

Either adjust the choke spring, assuming that you already have everything set up to make it functional, or just wire it open.
 
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Don't drive the car with the outboards disconnected. Adjust the rods and reattach them. Otherwise, very bad this can happen.

Either adjust the choke spring, assuming that you already have everything set up to make it functional, or just wire it open.
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The outboard carburetors and rods are installed
How do you adjust the choke spring?
 
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