07-14-2009, 09:05 PM
Join Date: Oct 2006
Location: Vancouver, Canada
Total Cats: 0
Emission Testing Problems
Well it is testing time.
I dug out my MAP from the last time I passed and tried that. It did not work.
The problem is Hydrocarbons
The pass numbers are as follows
HC 0.5000 CO 9.3200 NOx 1.24
My first try on the old MAP was
HC 0.6861 (F) CO 4.9027 NOx 0.4348
On my second try, I removed about 5% of fuel and 2 degrees of timing
HC 0.8478 (F) CO 1.0284 NOx 1.0876
Third try I went back to the base MAP (same as first try)
I added about 5% of fuel and 2 degrees of timing
HC 0.6614 (F) CO 9.7573 (F) NOx 0.3479
Back to the base MAP and took of the K&N Air filter
HC 0.6198 (F) CO 8.2921 NOx 0.4965
So the fuel and timing on the base MAP I am using seems OK.
I have now changed by PCV valve to the GTX one and added two catch cans . I have not had a chance to re-test yet but I want to run something by you.
I use 94 octane gas, if I fill the tank with 87 octane for the test would that lower the HC as the fuel burns cleaner/faster???