Failed emissions

[timjmcconnell at gmail.com (Tim McConnell)]

I have some tips here:
http://www.vintagewatercooleds.com/tech/Techtips/Timbotechnotes/emissions/emissions.htm

On 5/20/05, Eric Person <scirocco25@gmail.com> wrote:
> My car just failed the HC portion of the test, so I need to lean this
> thing out a bit.  In Chicago, we have a limit of 2.0 gpm HC, and my car
> tested at 2.42.  Im not sure how bad that actually is, but seems like im
> going to have to lean it out quite a bit to be safe.  We have to run on
> a dyno, at varied speeds, not just at idle, so just fixing the idle
> mixture isnt going to do much for me.  It looks like the HC is spiking
> on lift throttle between shifts(which is expected) but is hanging out
> just at or over the limit at almost all points.  The CO is just fine
> (half of the limit), and NOx isnt an issue, which is good because I have
> no cat.  The cat shouldnt affect the HC level anyways, right?  It just
> catalyzes NOx and  CO, correct(Its been a few years since my IC engines
> class).
> 
> So what are any tricks to get this thing to burn a few more hydrocarbons
> on the way out?  I'll probably replace the plugs, maybe check ign
> timing.  Would replacing the oxygen sensor help a lot?  And I seem to
> remember a certain 3mm allen screw, but im thinking that just changes
> the idle mixture, IIRC.
> 
> Any ideas Cali or NYC people?
> 
> Eric Person
> 86.5 16v
> 
> 
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