where does the a/f plug get plugged into? - Focus Fanatics
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Old 07-14-2013, 02:19 PM   #1
badazz2010focus
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where does the a/f plug get plugged into?

I know that if you have a stock manicat that you need to run 3 02's where does your a/f gauge get plugged into if both plugs are being used?


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Old 07-14-2013, 03:04 PM   #2
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Weld in another o2 bung before the CAT but after the header , local muffler shop can do this cheap , just make sure the bung is less then 1/2 inch over all , I would measure this to confirm , one guy this last week did this and the muffler shop installed a 3/4 inch bung and left less then a 1/2 exposed , after 2 Hrs of tuning and me telling him it was to long he removed the flex to see over 1/4 inch of the bung inside the pipe , this stops the wide band from getting a proper reading

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Old 07-14-2013, 05:31 PM   #3
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Sorry to ransack the topic. Will they drill the hole to or do i need to do that?
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Old 07-14-2013, 05:53 PM   #4
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How about this? Is it a viable option to going to the exhaust shop? I have never used one but it makes me wonder. You can get them at summit for about 40$
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Old 07-14-2013, 06:04 PM   #5
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don't bother. it takes just a couple minutes to do anyway. I'm not even sure how that's supposed to work... cut out a section of the exhaust?

all you have to do is drill a hole into the exhaust with a uni-bit until you find the right size where the bung can seat properly. screw in the 02 sensor, tack the bung into place and unscrew the 02 before it cools. Then you finish the weld.
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Old 07-14-2013, 06:29 PM   #6
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Looks like you drill the hole with the uni-bit and wrap it around the pipe& line up the hole tighten and screw in the sensor. The only benefit I guess is being able to remove the o2 wideband and spin the clamp around and it seal up the old hole. But then again why would you want to remove it other than the sale of the car and you wanna keep you stuff. Guess if it is welded in you can just put a bolt in the hole. Wow I just debated myself to a moot point... Nice talk...
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Old 07-14-2013, 06:32 PM   #7
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the aem gauge comes with everything you need bung included, all you need to do is bring it to an exhaust shop and have them drill a hole in your manifold
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