cat - failed emissions

[Michael Jez]

what year is the car ? If its a 91-93 and the PAIR is not workin correctly
it will fail on the HC part of the test. PAIR injects air into the exhaust
on deceleration. Leaky injectors would cause a high HC count, crappy spark
plugs that cause it to missfire will cause a high HC count. HC is basically
unburnt gasoline. Old 02 senors can cause high HC readings also. Do they do
the DYNO test on the roller ? if so they should give ya a graph print out
which shows O2 response, if the graph is pretty solid- meaning straight and
not much movement up and down, the O2 sensor is shot and that is probably
the reason your car failed the test. For my SE-R putting a new cat on it
made it pass with flying colors- mine was failing HCs, but I knew everything
else was in order- cause it had brand new sensors, solenoids, EGR equippment
on it when I rebuild it. I tested a new QG18DE Sentra on a 5 gas analizer at
work for shits and giggles and they produce like "2" HCs not 220 like our
state limit is for 93 cars- I am not sure about other years as my Maxima is
not eligible for a test yet- eighter way it will pass cause they only scan
the ECU for codes on cars 96 and up.
Michael Jez
01 Max 5spd- every mod- getting close to that 100K mile club :) Zero
Problems so far.