Re: [tech] Smog check & timing

[Shawn C Meze <skerocdriver@juno.com>]

On Sat, 09 Dec 2000 16:22:34 -0000 "Ben Channard" <zeroid@hotmail.com>
writes:
>Hi all:
>
>	Assuming all else being constant, what is the relationship 
>between ignition 
>timing and emissions?  In other words, if the timing is advanced or 
>retarded, how does it affect hydrocarbons, NOx, and CO levels?  This 
>is in 
>relation to my 81's (1.7L EN, CIS) looming California smog test date.  
>
>Thanks for any insights, benton-----


You have no choice but to set it to the factory setting. (Since thats
what the smog tech should be looking for. its one of his questions on the
test.) it will smog better there anyways. I accidentally set mine to 12
degrees advance and smogged the car. (With no cat too, oops.) It failed
and the smog tech said it was for the timming being off. He reset the
timming and it passed. (Still with no cat. Oops. Shhhhh!) Ive had bad
cats fail my car from smog. Sometimes a bad cat is worse than no cat.
(Who could expect a 14 year old cat to still work like new? Especially
since the industry only expects 5 years max life out of them.)

The rule of thumb is a fresh tune up (Which would include the timming)
should always be done before a smog test. if the engine and related
components are in proper working order, it will pass smog. However,
depending on where you take it, I try to keep the cat hot so when they
put it on the testing dyno it's up to its operating temp and working
correctly. A good drive before (10-20 minutes should do it easily) you
test helps and minimizing the down time at the test facility helps too. 
GL!!


Shawn Meze
86' Jetta GLi 8V                   84' Scirocco 8V
82' Scirocco GTi -FSP 30-   81' Scirocco<-- FREE to a good home!
The Fastest, Quickest, Cleanest and best looking Scirocco in all of San
Diego!
http://www.Geocities.com/MotorCity/Speedway/1308/index.htm

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