Re: [alfa] Re: emissions once again

[James Montebello <jamesm@xxxxxxxxxxxx>]

This assumes it *has* an O2 sensor. Not all CIS systems did.  There is
a mixture adjustment on CIS, on the airflow meter.  It can make the
difference between passing and not, esp. if you don't have an O2 sensor.
Buy another cat.  At 177K miles, it's dead.  Universal models are
inexpensive, and it will drastically lower your emissions.  If it does
have an O2 sensor, buy one of those, too.  Even if you do it only once,
they'll allow you to pass this time effortlessly, and run cleaner for
as long as they last.

jamesm

On Sun, 15 Feb 2004, Joe Elliott wrote:

> So I take it this isn't an Alfa?  (I'm assuming that you meant Bosch
> K-Jetronic or Bosch CIS, which are the same thing.)  I would guess
> that it's running rich--HC stands for hydrocarbons, or unburnt fuel.
> If it's running rich enough to fail a smog check on HC, I'd be
> concerned that there might be enough unburnt fuel in the exhaust to
> damage the catalyst.  There were a lot of different versions of that
> system over like 20 years, and I'm not terribly familiar with any of
> them, but if there's not something you can adjust to lean it out a
> bit, maybe you should replace the oxygen sensor.
>
> -Joe
>
> At 6:39 AM +0000 2/15/04, alfa-digest wrote:
> >Date: Sat, 14 Feb 2004 17:34:33 EST
> >From: Alfanovice@domain.elided
> >Subject: [alfa] emissions once again
> >
> >With all the talk and expertise on emissions testing, I thought I would pose
> >my own question.  In Texas the test is run at 15mph and 25 mph.  In my case
> >low speed resulted in 1887 rpm and high speed in 2030 rpm.  My car
> >barely passed
> >HC's on the low speed test by 1ppm last March.  This means it showed 193ppm
> >with a standard of 194 ppm for HC's.  CO% and Nox(ppm) passed just fine.  Can
> >anyone tell me why HC's are high and what I might have to do next month to
> >pass?  This car just needs to pass one more time.  Yes, I believe the cat is
> >original, with 177,000 miles.  Also, on the high speed test, HC's
> >passed with 163
> >ppm with a standard of 189 ppm.  This car has Bosch KIS injection, four
> >cylinders, and a five speed transmission.
> >
> >Thanks for any and all suggestions,
> >Brian Ancelin
> >Denton, TX
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