Earthing off your ecotec O2 sensors

[Not_An_Abba_Fan]

SC 6's use more fuel in the city than the NA 6's, but for some reason are better on the highway. More air I suppose. But on acceleration they just pour the fuel in.

It's only the RH O2 sensor heat wire that is the problem, not the earths.

So you cut the red on the sensor side of the plug then Surfwagon? Because on the loom side it is pink.

[Surfwagon]

SC 6's use more fuel in the city than the NA 6's, but for some reason are better on the highway. More air I suppose. But on acceleration they just pour the fuel in.

It's only the RH O2 sensor heat wire that is the problem, not the earths.

So you cut the red on the sensor side of the plug then Surfwagon? Because on the loom side it is pink.

Yeah I know all about fuel usage of L67's I've owned one for 10years.
My city usage was as stated, 17's for the last 4-5yrs with trips to Qld usually netting 9.5-10's then suddenly around October last year she starts drinking fuel.
Tried new O2's with no change, then read the pink wire cut method and decided to try it and it worked but only during the cruise cycle for some reason on my engine.
In regards as to which wire to cut there is an interesting twist.
For some reson unknown to any of mankind Holden uses the same 4 colours on the sensor as in the loom but puts them in a different position so you have to find the pink wire in the loom and match it to the corresponding wire on the sensor side of the connector which just happens to not be the pink wire.
It just makes it easier to cut the sensor side instead of the loom side.
It's interesting that someone mentioned an exhaust leak as a source of O2 being sucked into the exhaust as mine has a tiny exhaust leak but unfortunately for this scenerio the leak seems to be only on the drivers side whilst both O2's read the same on logging.
They are both working as designed when cruising but on decelaration and closed throttle they only seem to read half range which usually means they cause a rich mixture.
Any ideas will be gladly accepted no matter how way out they might seem.
I mean who would think that Holden would be cutting a wire as a fix for a problem.
Also similar thread.http://forums.justcommodores.com.au/...eply&p=1034238

SW.