89 Choke plate - JeepForum.com

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post #1 of 5 Old 02-04-2010, 09:40 PM Thread Starter
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1989 YJ Wrangler 
Join Date: Nov 2009
Location: Leominster
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89 Choke plate

Hey guys, first jeep, first carbureted vehicle and first post. My jeep has always been reluctant to start in the cold, but always would after a few tries. Until tonight when I let a friend borrow it. The other day I was looking at the carb thinking this could be the source of my cold start problems and WOT acceleration issues and I remember pushing on the choke plate and it would slam shut on its own. Tonight my friend said he went to his house, let the jeep sit for about an hour then he could not get it to start. He thought he may have "flooded the carb" and when he took the air cleaner off to get to the choke plate he could not get it open to look into the carb so he forced it open with a screwdriver and now the choke plate barely shuts on its own. Any ideas on what he could have broke? Thanks for any help you can give.

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post #2 of 5 Old 02-05-2010, 04:35 AM
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1990 YJ Wrangler 
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Location: Boston MA
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Check the linkage to the choke pull off, probaby bent the link so now it won't shut properly.

By the way there is a spec for the pull off clearance, choke should never shut 100%

Post what carb you have, and we can go from there to help set it up for you
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post #3 of 5 Old 02-05-2010, 05:18 AM Thread Starter
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Location: Leominster
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Thanks for the speedy reply, I believe I have the carter BBD 2 barrel going by what I've seen and already read here. And you were right about the bent linkage once it was light outside and I had small idea of where to look I could see the issue right away. Here at carter BBD stock needle settings are some good pics of what I'm looking at. Hopefully next I can solve the slow start problem.
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post #4 of 5 Old 02-06-2010, 02:50 PM
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1990 YJ Wrangler 
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So to help with slow starts:

for the pull off linkage the adjustment is about 1/4"; so to do it you manually first,
take the air cleaner off of course;
set the fast idle cam on the fast idle step;
push and hold the pull off diaphragm all the way in (towards the rear of the vehicle, as if it had full vacuum applied to it from the vacuum line on the back).
Then try to close the choke plate all the way manually, don't force it.
horizontal clearance from the front edge of the choke plate to the edge of the carb should be about 1/4" . that is not the exact spec but close enough. you changet the clearance by bending the linkage a little bit with pliers.

If you already did this then you need to check the operation of the choke itself; do you have an electric choke? Is there a wire plugged in to the black round choke over on the passenger side of the carb?
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post #5 of 5 Old 02-06-2010, 05:55 PM
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1989 YJ Wrangler 
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Your friend might have forced the choke spring off of its lever inside the choke. This lever or tab is really thin and it doesn't take much to force the spring to slide off of it or bend it. Hope that helps.
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