on the post cat o2, should the voltage vary from about 250-600mv with a slow switch time, and under heavy load demand should you see rich condition for a moment(like the upstream) or should the mv stay lower? what does the ecm look for to set a po420(cat eff.)
2007-03-23 19:19:57 · 4 answers · asked by Anonymous in Cars & Transportation ➔ Maintenance & Repairs
here is a link to you question
P0420 Catalyst System Efficiency Below Threshold (Bank 1) replace cat
2007-03-31 04:55:12 · answer #1 · answered by jsn_ayers 4 · 0⤊ 0⤋
A GOOD cat? Slightly furry,with some purring going on.Feed it antifreeze,they love it! Oh,and kick it hard every now and again,they love that,too.
Oh,.5v-post warm up (closed loop) with variations between .7-.4 from feedback.Or whatever the others say,I'm off tonight.
2007-03-24 02:32:23 · answer #2 · answered by Anonymous · 0⤊ 0⤋
.25v-.75v fluctuating slightly less then the pre-cat. it should not hang to high under accel. the cpu/ecm/pcm compares the pre and post sensors and the switching rate to set a p0420
2007-03-26 14:57:54 · answer #3 · answered by gre_z_punk_squrl 2 · 0⤊ 0⤋
i have a idea...
to ask your questions on Yahoo Answer
I think it will be better
2007-03-31 11:26:59 · answer #4 · answered by vsunight 1 · 0⤊ 0⤋