1982 (2.5 Iron Duke) cj5 open or closed loop carb - JeepForum.com
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Unread 09-25-2011, 09:07 AM   #1
jclaude53
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1982 CJ5 
 
Join Date: May 2011
Location: Houston, Texas
Posts: 6
1982 (2.5 Iron Duke) cj5 open or closed loop carb

I just bought a non returnable carb for my 82 CJ5 it is an electronic feed back carb or closed loop carb....
(it seems some 80 - 83 cj5's were elect. FB and some weren't)
Now it look like I need an non electronic or open loop carb I have looked into this as far as I can and it seems "The carburetor operates in open loop until the oxygen sensor reaches a certain temperature (approximately 600F). The carburetor also goes into open loop when a richer-than-normal air/fuel mixture is required, such as during warm-up and heavy throttle application"
so is it possible to convert the carb to a open loop or or is there any need to if the carb is not hooked to any electronic feedback sensors should it stay in open loop mode
Or am I just totally off base here

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Unread 09-25-2011, 11:24 AM   #2
PlaneJob
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2004 TJ Wrangler 
 
Join Date: Sep 2007
Location: Dallas (Wylie), Texas
Posts: 267
I have dealt with several oxygen sensor equipped systems in the past and all of them, none were Jeeps, operated in a similar manner: The system ran at an "open loop" setting unless it was receiving a signal from the O2 sensor.

For Example: Volswagens are set up to run VERY rich if there is no O2 signal, but they will run. The excuse for this richness is that it will not burn up an engine, like a lean setting will.

A honda that I had would work quite well with no O2 sensor - the engineers set the default open loop pretty close to what was seen in normal operating conditions at sea level.

I would hypothesize that if you set the carburetor to the proper mixture without the O2 sensor hooked up then you would have no issues. The O2 sensor usually serves to lean the mixture for improved emissions and fuel economy. If you get it set right you will just be operating like a normal carb without the leaning benefits of the feedback carb.

Or perhaps I'm talking out of my *** when it comes to Jeeps...
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Unread 09-25-2011, 09:24 PM   #3
jclaude53
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1982 CJ5 
 
Join Date: May 2011
Location: Houston, Texas
Posts: 6
Thanks for your reply that is what I was thinking but needed some confirmation that I'm not totally off base with this theory I could use all the feedback I can get about this again thanks
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