Emissions revisited

Paul Luevano paul at clarity.net
Thu Dec 11 23:12:58 EST 2003

Hi all-

Looking for some help.  My 200 failed Mass. emissions again.  :(  I'm guess
there is something "wrong" since this seems to be a reoccurring issue. 
Apologies for the long post.

Here is my original post from 2 years ago, to save making this even longer a

And then a follow-up:

It eventually passed, but I don't know what the final numbers were, I think they
just wanted to get rid of me, which was ok with me.

I think there is something definitely wrong with the car, just need to figure
out what. At 2500rpm, everything is ducky.  Its just at idle where the problem
is.  The car is obviously running rich at idle.

Here are the numbers (2001 test and 2003 test):

Pollutant       Reading ('01)   Reading ('03)   Limit
---------       -------------   ------------    -----
HC PPM Idle     393             308             220	<---FAIL     
HC PPM 2500     105             82              220
CO% Idle        0.61            0.63            1.2
CO% 2500        0.60            0.73            1.2

For the test this year I was running a mix of 1:3 gas:dry gas.  Car now has 170K
miles on it.

Now, any suggestions on reducing HC's at idle?  I've been told that there is a
potentiometer in the MAF sensor that controls the idle mixture.  Anyone know
about it and how to adjust it?

I fear that this might be a result of my Stebro "High Performance" cats.  But I
really feel that this car should pass emissions even without cats.

Any suggestion and advice welcomed!  I'm heading to a friends shop who has
access to a 5 gas analyzer, so any advice before that would be great!

Also wondering if anything like this might help:

I'm usually VERY cautious of these types of things, and would rather find the
root problem, but I also want to get my car past the test!  The example emission
test provided on that site are pretty impressive.

Paul Luevano            |   AMA * MSF   |'99 CBR 600F4  (Racebike)
http://teamdaemon.com   | USM * CCS #898|'97 CBR 1100XX (Streetbike)      
Waltham, MA USA         |  NMA #116657  |'91 200TQ20V   (Winter)
_____"The purpose of man is to live, not to exist."-Jack London_____

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