Hey, I just put on a new AVS2 Carburetor #1906 650 CFM With Electric Choke, Satin Finish (Non-EGR) and it’s seems that my car is running on a high idol and does not come back down. Can anyone point me in the right direction on trying fix it.
High Idle
- Thread starter brandvdub
- Start date
cbarge
World Famous Barge in a Budget
Did you hook up the electric choke to a switched power source?
Did you try backing down the high idle set scew a bit?
All new carbs will need adjustments right out of the box.
Using a vacuum guage you can set the carb up to your engine.
Also check for any vacuum leaks that can cause a high idle condition.
Hope this helps.
What rpm is "high idle" in this situation? Can you get it down to about 625rpm on a dwell tach with the idle mixture screws adjusted to "lean best idle"? It should go into "D" from "N" smoothly with no jerking. Same with "R" from "P".
What engine and intake manifold is this happening to?
Just curious,
CBODY67
What engine and intake manifold is this happening to?
Just curious,
CBODY67
I don’t know where to find the idle screw unfortunately unless it’s the two screws on front of the new carb. If it is the two screws then yes I did adjust them.
OK Look at the installation instructions the choke idle and throttle will have adjustment screws.
On the carburetor where the throttle and transmission linkages hook up, there is ONE idle speed screw that directly touches that linkage. That is the idle speed screw.
On the front of the carburetor, in the base near where the carb base gasket is placed between the carb and intake manifold, those are the idle mixture screws. Those need to be adjusted for the maximum rpm at hot base idle. Which usually coincides with the max intake manifold vacuum levels, BUT this will NOT tell you if the idle speed is correct or "in ball park". That is where a tachometer comes in, to get the idle speed where it needs to be.
Going by "sounds of the engine" is not always accurate! Some engines sound "fast" when they are not, as to idle speed. Others are quieter. End result, unless you are using a dwell tach to do the idle speed and mixture settings, you can NOT end up where things need to be, from my experiences. ONCE you learn these things with a dwell tach, THEN if you also paid attention to the vacuum gauge, you can do things using the vac gauge, pretty much.
IF you do not have one, the Edelbrock Carb Installation Guide can be downloaded from the Edelbrock website, for free.
Take care,
CBODY67
On the front of the carburetor, in the base near where the carb base gasket is placed between the carb and intake manifold, those are the idle mixture screws. Those need to be adjusted for the maximum rpm at hot base idle. Which usually coincides with the max intake manifold vacuum levels, BUT this will NOT tell you if the idle speed is correct or "in ball park". That is where a tachometer comes in, to get the idle speed where it needs to be.
Going by "sounds of the engine" is not always accurate! Some engines sound "fast" when they are not, as to idle speed. Others are quieter. End result, unless you are using a dwell tach to do the idle speed and mixture settings, you can NOT end up where things need to be, from my experiences. ONCE you learn these things with a dwell tach, THEN if you also paid attention to the vacuum gauge, you can do things using the vac gauge, pretty much.
IF you do not have one, the Edelbrock Carb Installation Guide can be downloaded from the Edelbrock website, for free.
Take care,
CBODY67
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