[V8] Oxygen sensor ground wire attachment point

[urq]

... well, it isn't clear that all those changes are related to simply moving
the ground point for the OXS ... to be able to confirm the theory, try
relocating the ground to the original location to see if the behaviors swap
...

If you find a clear relationship, I suppose there is some chance that the
ground loop you set up has something to do with it.  Ground loop problems
can be pretty enigmatic.

Yes, the timing and refernce sensors are located in the same area ... in
fact the interface connectors are attached very close to the cruise control
linkage bracket ...

Steve BSan Jose, Kaleefohnia (USA)
----- Original Message ----- 

> Steve, after reading your email, I decided to relocate my OXS ground wire.
I found a bolt that goes into the block about where you suggested.  It's
right behind the bracket for the cruise control and throttle linkage.  There
was only one wire attached to it.  I loosened it, sprayed with carb cleaner
then brake cleaner (because I'm out of electrical contact cleaner) and added
the OXS ground wire to it.
>
> The results are confusing.  The surging seems to be much less now.  But
there are other results that I didn't expect and don't necessarily
understand.
>
> Before, cold starts were terrible.  It would crank fire and die, then fire
right back up but bog until it warmed some.  now that is gone.
>
> Before, with light throttle application at around 1500 rpm, it would
sometimes buck or miss just a once or twice.  Now this is much more
pronounced, especially when the car is partially warm.
>
> When fully warm, which is reletive here now with the cold weather, the
surging is nearly gone.  I'm thinking it may go away entirely as the ECU
learns.  Actually, I think I'll pull fuse #27 before I leave work today to
clear the ecu adaptive memory.
>
> I didn't expect any change to the cold start behavior because the system
is open loop then right?
>
> I'm wondering if the carb/brake cleaner had an effect on something else
that might be below the ground bolt.  Are the timing and ref sensors near
there?
>
> Kinda weird stuff, but so far, for the better overall.
>
> Confounded in Colorado Springs