Passing Emissions

[John T. Luyster]

In my case with the high Nox with the Infinity QX4 that headers were tested
with there really wasn't anything I could alter in the test procedure.  The
test was done in a temp controlled dyno cell and atmospheric Nox and humidity
are taken into the equation.  So I don't think it would make a differance if
the test was done in winrer or spring.  The test fuel used is the same as
used ny Infinity/Nissan for their vehicles.  I could use a "Fed" test fuel
which has higher ppm of sulfur than say the "Calif." test fuel.  The high
sulfur should help reduce Nox but trashes the CAT in this vehicle.  Nissan
has had that problem for awhile because eastern states are now selling Calif.
vehicles but selling fuel with a higher sulfur content and CAT warranties
skyrocketed.  So my hands are pretty much tied. There more I dig into this I
find out more skeletons rat holed in Infinity TSB's.

CSH-HQ wrote:

> Fresh oil change.
> Use a oil/air seperator on PCV line, to min oil bypasiing to intake.
> Low Octane, faster burn, less timing.
> hotter operating temp.
> Heated o2
> Fresh ignition parts.
> Measure terminal distances for rotor, and rotor lenght, and use the combo
> with min air gap
> If in doubt phase rotor
> SBC, restrict waterpump bypass hole on pass side of water pump.
> Completely heat soak engine, with long drive.
> Higher than normal idle.
> ETC
> Bruce
>
> >I was re-reading the "too high NOx" post and wanted to start a thread
> >on the subject of passing emissions.  The way my state works it, I
> >had settled on the fact that I'll just have to be waivered (spend
> >$150 to repair and it can fail and you can still drive). If I can
> >pass thats great so I'll try. Here are the facts I've collected from
> >readings:
> >
> >If your NOx is high:
> >use more octane
> >cooler air is better
> >test in winter or spring.
> >Disconnect Supercharger belts (if its the type that can be)
> >
> >So lets add some stuff. specifically what to do to ecm to help. on
> >the buick list site there are links to "emissions" chips and there
> >are also the stock chips available (bins). might be interesting to
> >disesct them huh?
> >~~~
> >Dave Z. www.delanet.com/~tgp
> >