How do you adjust idle on carb?
Thread Starter
Joined: May 2008
Posts: 3
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From: Kenosha, Wi, USA
How do you adjust idle on carb?
Just picked up my 1st carbureted vehicle, and I have no idea how to set the idle on the carb.
It's an 86 civic. 1.3L 4spd. No tach, so I dont know where the idle is, but it sounds like its idling at 3K-4K rpms.
Some help please?
It's an 86 civic. 1.3L 4spd. No tach, so I dont know where the idle is, but it sounds like its idling at 3K-4K rpms.
Some help please?
My Name is Nobody
Joined: Jul 2005
Posts: 14,438
Likes: 3
From: Las Vegas, NV
Re: How do you adjust idle on carb? (86gasaver1500)
there should be a air/fuel ration screw on the body of the carb somewhere... also make sure you have some MINOR play in the cable when its fully relaxed, if the cable is to tight you may be pulling on the butterfly slightly causing a fast idle
Thread Starter
Joined: May 2008
Posts: 3
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From: Kenosha, Wi, USA
Re: How do you adjust idle on carb? (MSchu)
any idea where this is? I dont want to adjust the wrong thing!
pictures? please? This thing runs well, just idles VERY high. I know the carburetor was messed with at some point, so I think the idle just needs to be adjusted, and she can be driven.
pictures? please? This thing runs well, just idles VERY high. I know the carburetor was messed with at some point, so I think the idle just needs to be adjusted, and she can be driven.
Screw you guys, I'm... going... home.
Joined: Sep 2003
Posts: 2,950
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From: lovely Raleigh, NC
Re: How do you adjust idle on carb? (MSchu)
Since no one has said it yet, http://www.redpepperracing.com/forums/index.php? is the best place in the world for info on your vehicle. 
From the manual at the top of every page go to the carbureted section and read the pages on the automatic choke, fast idle unloader, and choke opener. You need to make sure that the choke is opening and that the fast idle cam is unloading to let your idle fall down to where it is set with the idle screw. Be sure to check all of your vacuum lines for leaks. Once that is done, you can inspect and adjust the idle mixture and idle speed as described on pages 11-24 to 11-27. If you have done all that and still have a problem then post your questions in the Technical-->Carbs forum. Good luck!
From the manual at the top of every page go to the carbureted section and read the pages on the automatic choke, fast idle unloader, and choke opener. You need to make sure that the choke is opening and that the fast idle cam is unloading to let your idle fall down to where it is set with the idle screw. Be sure to check all of your vacuum lines for leaks. Once that is done, you can inspect and adjust the idle mixture and idle speed as described on pages 11-24 to 11-27. If you have done all that and still have a problem then post your questions in the Technical-->Carbs forum. Good luck!
Trial User
Joined: Jul 2021
Posts: 1
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From: Kennesaw, Georgia
Re: How do you adjust idle on carb?
I have an 86 honda sedan, it has a 3bbl keihin carb on it and yesterday I went to drive it around and it died at the red light. I pulled into a parking lot to adjust the primary idle adjust screw on the back of the carb next to the coolant hose. It wasn’t there, at some point it fell out, I’m trying to find an aftermarket one online or get one off of another carb but designs are different and I need some help, some guidance from fellow shitbox owners. No offense, I take pride in keeping my shitbox living.
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Honda-Tech Member
Joined: Jan 2011
Posts: 322
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From: SF bay area
Re: How do you adjust idle on carb?
I have an 86 honda sedan, it has a 3bbl keihin carb on it and yesterday I went to drive it around and it died at the red light. I pulled into a parking lot to adjust the primary idle adjust screw on the back of the carb next to the coolant hose. It wasn’t there, at some point it fell out, I’m trying to find an aftermarket one online or get one off of another carb but designs are different and I need some help, some guidance from fellow shitbox owners. No offense, I take pride in keeping my shitbox living.
here on the left coast we have picknpull dot com which has a online inventory check
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