Michael Pardee wrote:
> "vairox" <nothere@spammasters.com> wrote in message
> news:kfkn42tvaipokjplcnm1arlpqt85j3rehc@4ax.com...
>
>>On Sun, 23 Apr 2006 13:33:47 GMT, "Elle"
>><honda.lioness@nospam.earthlink.net> wrote:
>>
>>
>>what are the other causes of high nox? high combustion chamber temps
>>due to carbon buildup is one but im not sure of any others
>>
>
> Technically, the causes are high temperatures and rapid cooling, which
> causes the NOx to "freeze" instead of decaying as the gases cooled.
>
> Since the expansion time is pretty much determined by engine speed, that
> leaves combustion temperature as the factor we can control. Carbon really
> isn't an issue directly, but it can cause preignition which has the same
> effect as advanced ignition timing. The two big culprits are ignition timing
> and mixture. Advanced timing increases combustion temperatures, and a leaner
> mixture at high throttle settings (when it should be rich anyway to
> forestall detonation) does the same. EGR reduces the temperature by diluting
> the mixture without affecting the air/fuel ratio.
>
> Mike
>
>

good post. yes, check timing and mixture. mixture can be assisted by
running a couple of tanks with injector cleaner through the vehicle.
timing should be set with the maintenance jumper connected. and it
should be dead-on, not just close. regarding egr, it's often addressed
these days by increasing the overlap between exhaust and inlet valve
timing, so make sure the valve clearances are correct.

to the op, no, an oil catch can is illegal in california.