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Discussion Starter · #1 ·
I was doing some work around the regulator and rail and notice a threaded hole inmy upper plenum. It's on the driver side just to the left of center at the bottom of the plenum across from cylinder 6cyl. Anybody know what this is for? and if anything suppose to be plugged into it?

And before you reply I did use the search.
 

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Past Bronco Owner
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Do you mean the one in the pic here in the lower plenum? It is threaded but unused (on my 90 anyway).



You don't have any info on your Bronco listed so it's hard to tell.
 
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