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post #1 of (permalink) Old 12-20-2000, 02:45 AM
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stock carb in a 90yj

I've got the idle jet blue's in my 90yj inline6 I've been told to just get rid of this carb but i'm low on funds for a while. just wondering if anyone knows of an upgrade for the stock idle jets, or has anyone drilled out the jets befor?
I've never done any mod's to a carb befor, I've been told that it's this fix is easy. Is this true?

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post #2 of (permalink) Old 12-20-2000, 06:04 AM
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Re: stock carb in a 90yj

i ended up buying a new rebuilt carter by holly for $185 at checker auto and am very happy![img]/wwwthreads_images/icons/smile.gif[/img] have you checked out these?
http://www.off-road.com/jeep/tech/258bbd/Major.htm
http://www.off-road.com/jeep/tech/engine/carter.html
no i have never drilled out the idle tubes although i have blown them out and misc adjustments to the old one with no luck. it was a $185 well spent in my opinion but maybe you can salvage yours!

post #3 of (permalink) Old 12-21-2000, 02:30 AM
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Re: stock carb in a 90yj

What kind of adjustments have you done to yours in the past? I've taken the idle jests out and did a half ass cleaning job (15 min job) and it made a big differance. so i'm thinking that if I clean it realy well with proper cleaner and then adjust the carb maybe i can get her to run a little nicer till i can replace it.

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post #4 of (permalink) Old 12-21-2000, 02:30 AM
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Re: stock carb in a 90yj

Definitly check out the sites recommended by sas87yj. They are very helpful and the 4.2 engine can run smoothly with the bbd carb...it just takes a while and some fiddling. This board has tons of helpful info on these carbs. The MPI would be the ultimate but that darn budget!

'88 Sahara
post #5 of (permalink) Old 12-21-2000, 02:40 AM
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Re: stock carb in a 90yj

Is there a idle fuel mixture set screw? just noticed that the wire that go's into the Sol-Vac has broken off the unit would this make a differance?
post #6 of (permalink) Old 12-21-2000, 06:41 AM
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Re: stock carb in a 90yj

it could help to connect the sol-vac. egr valve, cto valve and temp sensor are all key players. check these too! there are two air-fuel mixture screws, one for each barrel. you could mess with these also. i am not too lucky with carbs![img]/wwwthreads_images/icons/smile.gif[/img]

post #7 of (permalink) Old 12-21-2000, 07:44 AM
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Re: stock carb in a 90yj

hey what is the cto valve??

post #8 of (permalink) Old 12-21-2000, 11:34 AM
 
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Re: stock carb in a 90yj

Take the carb off the manifold, take the top off the carb, remove the fuel inlet (needle and seat) to remove the float and blast out all passages with aerosol carb cleaner. You can remove the idle mixture screws as well and shoot carb cleaner thru those passages, but mostly clean out the float bowl to prevent recurring blockages, and blast out the passages in the bottom of the float bowl.

Tighten all bolts on the intake manifold to eliminate any vacuum leaks. Also consider unplugging the stepper motor (if legal in your area) and adjusting idle mixture screws by hand using a vacuum gauge for peak lean vacuum.


You might want to consider swapping in a Motorcraft 2100 carb. They idle really well. Need a cheap adaptor plate, open element air cleaner and some work on the throttle linkage. Get one from a 304 amc or 302 ford.

Tim

84 CJ7, 258, HEI, M/C 2100 carb, 5 inch lift, RS9000's, 33x12.5 BFG M/T's, Lockright, full cage & belts, Xenon flares, AMC 20 1pc axles, GM dual diaphragm brake booster
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post #9 of (permalink) Old 12-21-2000, 12:58 PM
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Re: stock carb in a 90yj

A CTO Valve is a thermal vacuum valve. Found this At http://offroad-net.com/jeep/tech/258bbd/cto.htm
The best site for info that i've ever seen



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