[s-cars] my '92 failed smog

[Mark Strangways]

Oil makes a big difference.

HC's build up in used engine oil.
At 7,000 Miles it doesn't owe you anything and changing it *should* help 
your smog tests.

Mark
----- Original Message ----- 
From: "Theodore Chen" <tedebearp at yahoo.com>
To: "Sean Douglas" <s_douglas at telus.net>; <s-car-list at audifans.com>
Sent: Friday, April 11, 2008 12:39 AM
Subject: Re: [s-cars] my '92 failed smog


> 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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>
>
>
>
>
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