UPDATE, Fwd: CARB's smoggy skies

[Chris Dyer]

Thanks to many tips like this one, combined w/the data from the smog test, 
tells me that it's likely a mixture and/or bad o2 sensor. AND according to 
SJM's site, a likely cause of my cold start idle fluctuation. GOD, I LOVE 
THIS LIST! (could be 82 other things, but I'm going with this...)

I still MIGHT pass w/o the above tweaks...but the work will still have to be 
done. Smog re-test update to follow. As are my late reg fees. (see what 
happens when you procrastinate)


>
>Failed my smog test today--GRRR!!! Missed CARB's hydrocarbons by 8, max
>allowed is 120, mine 128. Other tests fine, car runs great, mobil 1 every 
>5k
>mi., etc.; idle measured on dyno is 751 rpm. (a wee low, no?)
>
>I'm planning on: red line fuel injector cleaner (run til empty), chevron
>supreme gas, finally a pre-check oil change.  Anything else I can do of a
>non-mechanical nature? (trying to avoid another visit to wrench)
>
>t.i.a.
> >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
>
>
>
>Chris:
>
>At that level on the HC you are sure to have something wrong.  With a
>properly tuned engine the HC should be down at about 35 to 45ppm or less.
>You are running a little rich on the fuel mixture.  If all tune 
>up/maintenance items are
>recent and correct,  if you have an analog dwell meter, do the CO mixture 
>adjustment/duty
>cycle check shown at Scott Mockrys site explained here.
>
>http://www.sjmautotechnik.com/injector.html#mixture
>
>Don't adjust the mixture, just do the following check.
>
>With the engine warm, make sure the dwell meter swings high/low on the duty 
>cycle several
>times a second.  Ignore what the reading is, just make sure it changes 
>several times a
>second.   If it doesn't, your O2 sensor is most likely old, tired and 
>reacting too slowly.
>
>If your O2 sensor is OK, you probably have a bad injector spray pattern, 
>leaking
>injector(unequal injection quantities), vacuum leak, or a bad catalytic 
>converter. If the
>converter is bad you may also fail the NOx portion of the test if you live 
>in a state that
>checks for it.
>
>Tom Chudzinski
>
>




from chrisdyer at hotmail.com


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