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Old Jan 12, 2004 | 03:44 PM
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From: irwin,pa
02 sensor bung thread size

i need the to know size of 02 sensor bung so i can get a fitting to take a back pressure reading to see if my cats are bad- thanks phil
 
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Old Jan 13, 2004 | 02:12 AM
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From: Cajun Country
Its called a "thread-o-let", and its 3/4".
 
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Old Jan 13, 2004 | 04:54 AM
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From: irwin,pa
really? service tech told me it's 18x1 .5 mm
 
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Old Jan 13, 2004 | 06:49 AM
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From: Cajun Country
I had an old exhaust pipe from my 93 F150 and took my 3/4 tap and it went in there fine.Oh well,I guess I would listen to the service tech then.But,its still called a thread-o-let.
 
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Old Jan 13, 2004 | 01:58 PM
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I would be surprised if it was not 18mm. It is a standard on most vehicles, including Fords. You can take almost any Ford 02 sensor and put it into another car, sometimes the only external difference is the number of wires or the colors. A lot of Ford techs have a spare (known good) sensor left over from warranty and just plug it into a car that might be bad for a quick test.

18mm x .03973 x = 0.70866 inches so 3/4 might look like it fits, it really does not.

You can buy back pressure testers from Summit or JEGS that will fit into this bung. The word bung is/was used when talking about the stoppers used in liquor barrels.

Which brings about the wonderful name of "Bung Hole Liquors" of Peabody MA.
 

Last edited by rebocardo; Jan 13, 2004 at 02:19 PM.
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Old Jan 15, 2004 | 10:42 AM
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it's true about the liquor store name and the threads are metric
18 x 1.5
http://ebaumsworld.com/signs2.html

TIP: if you need a cheap replacement non heated sensor(1 wire) get one for an early 90's gm vehicle, their under 10 bucks.
 
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Old Jan 15, 2004 | 03:06 PM
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From: irwin,pa
i wanted to make a fitting to test my cats-phil
 
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