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Old 11-22-2011, 01:41 PM   #1
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Carb problem

First, thanks to those that replied to my suspension question.

I have a problem with my '86 CJ7 running at idle. The previous owner added a manual choke, which needs to be used to start. Problem is that it only idles (roughly) with the choke pulled, but needs to be pushed in to drive. It is difficult to balance between the two conditions when trying to drive slow. (I know, why drive slow, but this is a hilly farm and speed control is needed.). I believe all emissions stuff is either taken off or disconnected. Any suggrstions on how to fix the idle / running problem?

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Old 11-22-2011, 04:32 PM   #2
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4,6 or 8 cyl?

2 or 4 barrel carb?

Stock or aftermarket?

I would start by checking to make sure your power valve is good, check your floats, check your idle/air mix and then look at re-jetting if the issue remains.

But it may be a vacuum issue or at least part of the issue is vacuum related from the sounds of it.

'76 CJ7
It's red.
'99 TJ
It's red too.
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Old 12-01-2011, 03:15 PM   #3
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The way I read it! it won't idle at all without the choke pulled out!
Warm it up and adjust the carb idle screws, jet screws, etc.
A manuel choke is like a gas pedal! it doesn't have to be all the way out or all the way in!
WHen you first get in! push the gas pedal to the floor and pull the choke knob out! this will set the high choke cam idle.
Start the jeep.
Give it a minute, and it will start to run rough. Push it in about 1/4 of the way! should stay at high idle and now it should smooth out!
You will probably need to run at a little choke for a while till the engine temp is up!
Then push it in ALL the way!
If the carb isn't adjusted right, you will fight the choke!
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Old 12-01-2011, 04:33 PM   #4

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Manual chokes are super easy to use. You just need practice and patience. They almost never give you problems at all, once you know how to use them correctly. I agree with Stumpbumper. Learn to use the choke correctly and see how it does. Once the engine is warmed up and the choke set for that, you shouldn't need to adjust it again until next time you start the cold engine.

Take care,
Check "YJ V6 Conversion Swap" if you want to see my "frame up" restoration that anyone can do.

Check "WWII Willy's restoration and usage..." if you want to see THE ORIGINAL JEEP IN ACTION.
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