Thought this might of interest to some...
Robert K. Kuhn
CRX Owners Group President (http://www.crx.org/southcal)
1990 Honda CRXsi (http://www.hooligan.cc)
ICQ # 3714283 (nickname: godzilla)
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Date: Sat, 04 Jan 2003 17:46:02 -0800
From: Citizen Kang <[EMAIL PROTECTED]>
Subject: RE: CRX: smog questions
To: "'Robert K. Kuhn'" <[EMAIL PROTECTED]>
Cc: [EMAIL PROTECTED]
While hydrocarbon emissions drop as you lean out the mixture, NOx
readings will skyrocket. The lack of a functioning catalytic converter
would certainly cause such conditions.
A garage could verify this by doing what is called a pre-cat test. They
sample the gases at the tailpipe at idle and then drill a hole in the
exhaust upstream of the cat and take readings there. If the pre-cat
readings say 1000ppm and the tailpipe readings say 200ppm, your cat is
deemed to by 80% efficient. If the tailpipe readings are the same as
the pre-cat readings (which might be the case here), it would mean that
the cat is pretty much dead (ie: close to 0% efficient).
For more information, try:
http://www.terravista.pt/fernoronha/6876/study-germ.PDF
> -----Original Message-----
> From: Robert K. Kuhn [mailto:[EMAIL PROTECTED]]
> Sent: January 3, 2003 8:50 PM
> To: James Lindsay
> Cc: [EMAIL PROTECTED]
> Subject: Fwd: CRX: smog questions
>
>
>
> ---[ Forwarded Message to follow ]--------------------------
>
> >Date: Fri, 3 Jan 2003 15:52:39 -0800 (PST)
> >From: Kristian Hoffmann <[EMAIL PROTECTED]>
> >To: [EMAIL PROTECTED]
> >Subject: CRX: smog questions
> >
> >Reply-To: Kristian Hoffmann <[EMAIL PROTECTED]>
> >
> >I put my old D16A6 in my sister's car after rebuilding it.
> I just took it
> >in for smog for her, and it got 1550 on the NO reading. Max
> is ~850. The
> >plugs look slightly blistered like it's running too lean.
> Anyone have an
> >idea what the problem might be?
> >
> >Thanks,
> >
> >-Kristian
>
> ---[ End of Forwarded Message ]-----------------------------
>
>
> James ... do you have an idea as to why his Nitrogen would be
> high? Catalytic converter comes to mind first... I think
> that was how I
> discovered the problem with my stock cat a couple of years
> ago... once the
> engine (cat) warmed up, it would pass but it was on the high
> end. I also
> had close to 170K miles on the cat and Honda recommends that
> the cat be
> replaced at 100K miles.
>
> Anyway.. just thought I would see if you had any other ideas.
>
> BTW, the D16A6 engine is the stock engine in the CRX Si (1989-91).
>
> Thanks...
>
>
> Robert K. Kuhn
> CRX Owners Group President (http://www.crx.org/southcal)
>
> 1990 Honda CRXsi (http://www.hooligan.cc)
> ICQ # 3714283 (nickname: godzilla)
>
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