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I did a lot of experimenting with O2s, when I installed one in my exhaust, just where the Hedder dumps in.
I did quite a bit of checking when I was doing this (You were my very 1st answerer here at this site) Isn't that special!!!!........My question was about using a O2 sensor to Select the correct JETS, my 4 Barrel Holley Carburetor........almost 2 years ago.
I used both a DIGITAL Voltmeter, set on Millivolts, and also the AIR/ FUEL METER, it uses LED lights RED (lean) Yellow (stoich [close 14.7:1 perfect burn] ) and Green (rich)
Both methods are good for me, voltmeter is more accurate, but hard to keep up with........The lights really show whats going on with the O2 sensor if you are driving alone.
This method sorta sounds stupid for a Carburated CJ 5 JEEP........But after I finally figured out the factor that was throwing me off with JET CHANGING (wrong PCV for the way my engine was configured) , The Darn Jetting got EZ and I was able to Tune my Carb, to make it as efficient as it could be, with the way I drive.
Now, When things were screwy, I put different ones into a COMPUTER CONTROLLED CAR, just to see what both my Voltmeter and the A/F gauge would do. You simply just Jumper wire into the sender connection, lets the computer still use the info, and you can read it too.
Just like they said, The Computer keeps the Vmeter at about 450 MV and the Add On A/F Meter in the middle of the yellow light band (as it constantly adjusts for too rich and too lean) Does this really fast!...........Carb cannot keep up or rather hold this Efficient burn!....But it will help you get the carb right, a lot EZer than "PLUG CUTS", or keeping up with MPG all the time.
Moral of my NOVEL
If you hook up a Air/Fuel Meter or Voltmeter to the EXISTING O2......see what its doing...........Then swap to a new oneNot designed for the CAT! (they come heated and unheated) Try to find an inexpensive one that Connects in the same to your wires, and try it, see if starts showing about 450MV or yellow lights
A small Ma and Pop self service auto salvage yard might yield some really cheap TEST DUMMIES---Insure you write down vehicle info for each (yr, engine, make) so that if you find a winner----you can get a new one for THAT particular application.
I know the other sensors and O2s come into play with all of this, but what should the MV Output be on the CAT O2 if it were straight out of the FORD assembly line?
OK, I shut up now, I am an IDIOT, I am a Plumber with Jeeps.........Scold me now, Merlin2021
My Air/Fuel Meter is on my column, beside the tach.
Thursday, September 10th, 2020 AT 6:43 PM