Getting closer to solving rich running (long)
b.benz at charter.net
Mon Feb 18 10:38:51 PST 2008
How did you splice the universal O2 sensor wires to the old harness
connector wires? Good crimp connections should work but the Ni wire
will not soft solder. I used silver solder, with no problems.
On Feb 18, 2008, at 10:16 AM, Brandon Rogers wrote:
> Guys -
> So this weekend I did some more checking. As a quick reminder the car
> has a very rich exhaust at idle - I _think_ it is fine under load.
> car did pass Colorado's rolling road emissions - which makes this more
> perplexing. Car has been "rich" (according to my nose and my stinky
> clothes after driving it) for a few years....
> Ok so here's that info.
> Drove the car for a while - fully up to temp - pulled into garage -
> exhaust stinking up the place -
> engaged ProDiag. No codes - but pulled up the MBlocks:
> 1. Idle Stabilizer Characteristic Control Curve reads 57 (spec is
> 2. O2 Adaptation reads 174 (spec is 115-141)
> Shut down.
> Wait a good hour - pull the two "motor" fuses for about 30 seconds (to
> clear adaptations), turn to "on" for 20 seconds, then start. Let run
> for a few minutes but no driving - O2 Sensor Control stays at 128 for
> about 2 minutes then after a few minutes:
> 1. O2 Sensor Control occasionally climbed as high as 144 (spec is
> 123-133) then would go back down
> 2. O2 Adaptation goes as high as 142+/- but generally stays in spec -
> although on the high end
> Last night I pulled the fuses again to make sure I had pulled them
> enough to re-set the adaptation tables. Did not start car tho.
> This AM drove car - ended up bringing it back home as a nice boost
> reared its head about 5 minutes from home - but I still hooked up the
> ProDiag - NO codes - and on Mblocks:
> 1. Idle stabilizer in spec -
> 2. O2 adaptation at 142 - just out of spec (115-141) - this may
> not be
> reliable due to leak - but that was only audible at 10 psi+ - so??
> Maybe being on the high end of spec it runs rich enough to smell but
> still pass Emissions?????????
> As for 02 Sensors - - I've used 2 - one of which was a new universal I
> spliced into the old harness - and I _think_ the other was a new OE
> connectors. I could never tell a difference between the two.
> Big question is why is O2 sensor adaptation out of spec? Bad O2
> (both sensors????)? Bad something else? I did try a bone stock
> ECU and
> it seemed to be no different according to my nose - however I did not
> pull the MBlocks with it.
> 200q20v mailing list http://www.audifans.com/mailman/listinfo/200q20v
More information about the 200q20v