hi kelly ,

i've seen this many times before . 91 tercel high nox , cutline h.c. the backpressure port on the e.g.r. was plugged . cleaned and nox went down 500 ppm . h.c. elevated 50ppm . 02 good . lambda @ 1.6% lean . cat dead. new cat , ran in pre-test BEA... Login to read more.