carter bbd need curb idle - JeepForum.com
 
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post #1 of 3 Old 10-18-2009, 02:12 PM Thread Starter
IBGRMPY
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2007 XK Commander 
 
Join Date: Feb 2009
Location: Broomfield
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carter bbd need curb idle

Okay finished the rebuild of the carter bbd and when I was going through all the adjustments found out I dont have a curb idle screw.

I also have a plastic fast idle cam, so if anyone has a metal fast idle cam and curb idle screw they dont want please contact me.

When I screwed in the fuel mixture screws they went in 6 1/2 turns. I ended up having to back these all the way out to 6 in order to get an 800 RPM at warm idle. Wondering what this will do to the carb and gas mileage.

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post #2 of 3 Old 10-19-2009, 11:14 AM Thread Starter
IBGRMPY
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2007 XK Commander 
 
Join Date: Feb 2009
Location: Broomfield
Posts: 180
To provide more info on what I have done, first it has the Teamrush upgrade and it has been nuttered.

After rebuilding carb I only backed off the mixture screws 1 1/2 Turns. The Jeep started up beautifully and had a fast idle of 1200 RPM. As it warmed up the butterfly when to about 1/4 open and then the jeep died, it would not idle. I backed the mixture screws to 6 turns and it idles about 750RPM warm. I'm thinking this is probably why my plugs had so much build up on them.

Anyone have an opinion? I have a buddy with a BBD, so I will take out his curb idle and go to Ace to match it.

It was 35degrees out this morning and the jeep started beautifully warmed up and idle came down just as its supposed to. I was very happy with this, as I could not get it to idle when cold.
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post #3 of 3 Old 10-19-2009, 03:50 PM
Tortured
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Join Date: Jul 2005
Location: Las Vegas
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Sounds about right. Mine are backed out about 4 or 4.5 turns can't remember exactly. My old carb was about 5 turns out which shows how inconsistant these carbs are (the BBD I have now is a reman.). You may want to check for vacuum leaks or bad PCV Valve. Other than that these carbs don't adjust like old Rochesters or Holleys where 2.5 turns is all you need.
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