On Sun, 23 Apr 2006 13:33:47 GMT, "Elle"
<honda.lioness@nospam.earthlink.net> wrote:

>You're correct: A 93 Civic LX does not have an EGR system,
>according to my Chilton's.
>
>This seems like a helpful site:
>http://www.aircare.ca/index.php?repinfo-glossary.php . See
>especially
>"Causes of Excess Emissions."
>
>It puts a lot of emphasis on an improperly functioning EGR
>system causing
>high NOx , but it lists a few other causes, too. None are
>the PCV valve.
>
>http://www.interro.com/techgas.html#anchoreleven states
>similar.
>
>An improperly functioning PCV valve may cause high CO, which
>you don't have.
>
>What is a PCV valve "catch can"? Did you remove the PCV
>valve?
>
>"vairox" <nothere@spammasters.com> wrote
>> thanks guys... the O2 sensor was replaced by a shop the
>> last time it
>> failed (in july 04) and it failed with harder NOX and a
>> higher amount
>> of HC, though it was still in the legal limit....
>>
>> no ECU codes...
>>
>> might install a magnaflow direct fit replacement, if i can
>> get them to
>> confirm it is california smog/noise legal...
>>
>> sort of stumped cause i have another inspection coming up
>> in june or
>> july.... i am now using the proper OEM NGK plugs, did some
>> intake
>> cleaner throught the booster, idles much better, drives
>> smoother...
>> cleaned a lot of carbon off the pistons.
>>
>> you guys know what effect a PCV catch can would have on
>> emissions? i
>> know it wouldnt do squat on NOX, thats temp related....but
>> any others?
>>
>>
>

thanks for checking the chiltons, i only have a haynes and it's not
very specific about that... PCV catch can is just a can more or less,
you take the hose that comes off the PCV valve and it connects to a
can, then another hose goes from the other side of the can and goes
back to where the PCV hose originally went, it just sits in-line of
the PCV hose to catch all the oil blowby so it doesnt gum up the
intake/valves etc... still allows the gasses to go by and get burned
up...

what are the other causes of high nox? high combustion chamber temps
due to carbon buildup is one but im not sure of any others