| RE:Failed CA Smog Test |
Subject: RE:Failed CA Smog Test by MK 82 on 2008/2/10 23:06:08 Most newer systems do not employ air injection. Instead, they provide a constantly varying mixture that quickly and continually cycles between lean and rich to keep the first catalyst (NOx reduction) from becoming oxygen loaded, and to keep the second catalyst (CO oxidization) sufficiently oxygen-saturated. They also utilize several oxygen sensors to monitor the exhaust, at least one before the catalytic converter for each bank of cylinders, and one after the converter. Some systems contain the reduction and oxidation functions separately rather than in a common housing air. Bogus is right about the air injection. It is done for a short time after startup and in open loop. |
