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zr1don · 06-26-2011

I tried hot wiring the AIR inj pump on my 90. When first started the O2 sensors showed a way lean condition (air being pumped past sensors), NOX went down, then the computer dumped fuel in to correct the lean condition, HC's went up and continued to climb. I turned the AIR pump off after about 1 min. As a result of this experiment, the passenger side (brand new) cat was completely burned out, no internals.

06-26-2011	#8
zr1don Join Date: Jan 2006 Location: Temecula, CA Posts: 88	Re: VA emissions tuning I tried hot wiring the AIR inj pump on my 90. When first started the O2 sensors showed a way lean condition (air being pumped past sensors), NOX went down, then the computer dumped fuel in to correct the lean condition, HC's went up and continued to climb. I turned the AIR pump off after about 1 min. As a result of this experiment, the passenger side (brand new) cat was completely burned out, no internals.