[s-cars] my '92 failed smog

[Theodore Chen]

does oil really make that much of a difference?  my car has 7k miles on the current oil fill (topped off twice, for a total of 2 quarts added) and i was planning on changing it soon.

how much did your smog readings change after you changed the oil?

----- Original Message ----
From: Sean Douglas <s_douglas at telus.net>
To: Theodore Chen <tedebearp at yahoo.com>; s-car-list at audifans.com
Sent: Wednesday, April 9, 2008 7:37:01 AM
Subject: RE: [s-cars] my '92 failed smog

Teddy:

Before you go digging, try changing the oil. I failed on my 90q 20V and
after chnaging the oil, I ran it through again and the numbers dropped 3
fold.

Cheers,

Sean 

> -----Original Message-----
> From: s-car-list-bounces at audifans.com 
> [mailto:s-car-list-bounces at audifans.com] On Behalf Of Theodore Chen
> Sent: April 8, 2008 10:53 PM
> To: s-car-list at audifans.com
> Subject: [s-cars] my '92 failed smog
> 
> here are the numbers:
> idle (792 rpm) CO2 14.3% O2 0.70%, HC 211ppm (max 120) CO 
> 0.11% (max 1.00)
> 2512 rpm CO2 14.4% O2 0.40% HC 68ppm (max 140) CO 0.32% (max 1.00)
> 
> there aren't any numbers here for NOx.
> 
> two years ago, it passed easily:
> idle (1004 rpm) CO2 14.6% O2 0.5% HC 66ppm (max 120) CO 0.00% 
> (max 1.00) 2550 rpm CO2 14.9% O2 0.0% HC 3ppm (max 140) CO 
> 0.00% (max 1.00)
> 
> the turbo was changed during that time, to a GT2871 hybrid. 
> however, the software and injectors are the same as before, 
> and so is the induction system (still using stock airbox). i 
> can't see that change causing the jump in HC.
> 
> any ideas?
> 
> i thought it might be the catalytic converter, but the O2 
> numbers seem pretty low.  doesn't seem like there's a lot of 
> extra oxygen for the cat to use in converting the unburned HC.
> 
> -teddy
> 
> 
> 
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