Thread: Regrounding the O2 Sensor

Danja... Thanks for your input. Agreed.. This is the MAIN reading for the ECU when it adjust the A/F mixture. Thats why Im thinking the grounding will impact low idle bogging.

The dummy O2 sensor reading is great for fine tuning a modded ECU fuel maps and especially when at the dyno. When used, I placed the dummy O2 sensor in the bung just before the Cat but never removed the O2 sensor. In the last 6 months, I started researching the Calum ECU mods. Really cool stuff.. Some of the ECU mods eliminates closed-loop O2 feedback. But the factory ECU provides a tune in which a large part of the fuel map (lower RPMs and air flows) uses the O2 sensor to richen or lean out the mixture to maintain an AFR of 14.7

Haha fair enough, I will tell that to my coworker

Ok going home to tear up the O2 sensor!

You're welcome... Dont want to damage stuff ! Just improve stuff!!

No need to tear it apart.. We know how its constructed and whats inside..
See here: http://www.boschautoparts.com/NR/rdonlyres/4FFB8B13-A7CE-4042-BCDE-0AE712CCC0FB/0/Thimble.pdf The wires in the O2 sensor are protected from heat with a built-in isolator for protection.

Im off to the garage.. I will post something either later tonight or tomorrow morning..

how about useing a braided ground strap and soldering one end to the body of the sensor and then bolting it via ring terminal to the block.

couldn't you run a ground strap from the neg. terminal on the battery to the header stud closest to the battery? That would give the least resistance i would think, short of soldering the strap to the o2 sensor.

This is a bit more of what I was thinking...

Aww come on thats no fun!

Interesting, but it doesn't quite show to where the ground is connected. Basically I want to know to which part of the O2 sensor the ground is connected, so that then I can solder/weld something on to it

Note to self, buy the 4 wire O2 sensor next time



I'm thinking about that, but if the ground is not on the washer, then that might not be too good.



Well the way I have it going right now is, my negative goes to chassis and then to the Intake Mani.

I would think the header bolts would get the ground from the engine block...

i cant imagine making a batter ground than soldering a braided line to the hex head portion of the O2 sensor than bolting it to the block.

I agree, but it might make it a bit more difficult to screw and unscrew the O2 sensor...

if anyone is worried about things melting, soldering would be first on the list. how many wires are in the engine bay? how many wires are connected to the engine? how many of them are soldered?