hey again, i have a 1.3 carb'd samurai that just failed aircare
it burns maybe a liter of oil every month or two
i failed cause of carbon monoxide, but my hydrocarbons were high as well
NOx whatever that is, is extremely low

my o2 sensor is fine, oils changed, filters changed
this carb relys on sensors so much i dont know where to start, i dont think theres a screw to richen or lean it out, cause the numbers indicate im running rich
low NOx are from the cylinders not being hot enough i hear, normally cause its so rich

anyway, my cap and rotor appear almost new, wires are ok, and the plugs are new

any ideas? and possible ways to test them before i dump a bunch of money in

thanks a lot in advance
Andrew

What state are you in?

Maybe it's time for a new catalytic converter.

Name:  trialspro
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Date Registered:  Aug 19th, 2003, 12:48am

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well if your sammi is stock then it's a concern. but if you have a lift with bigger itres on, then you rig is working harder on the dyno with a 1.3 engine, and that could be what's causing it to have high readings. if so put stock tires on then go try again.

If it relys on the O2 sensor to correct
the carb then you might start there.

Find someone with an Ohm meter to
help you test it, or just replace it if it's
like more than 4-5 years old, then you
could try a retest, if it's a free retest like
lots of the smog shops here in California
then it's no big deal to test again.

If it fails again then you would have to
replace the Cat

On EFI cars the Cat is just there to do minor
exhaust cleanup, but on a carbed vehicle they
really get a workout, so if the Cat os more than
a few years old it will probably need a new one
also.

You were correct the Hydrocarbons are rich fuel,
the NOX are from lean and hot burning conditions,
and the CO are from a bad Cat which might revive
it's self if you can get it hot enough to relight it, that's
what a friend of mine said who does my smog checks.

I need a new Cat this year, too much heat abuse and
275,000 miles of running over 15 years has taken it's
toll and it don't cleanup the fumes like it used to

Good Luck
Wild

well i tested my o2 sensor like the haynes manual said, hook a volt meter to it, warmed up, it should read between 0.1-0.9 volts, the higher the number, the richer its running, mine measured 0.89

so whether the cat works or not, i figure its being run to rich in the first place... i created a vacuum leak by pulling one hose, that seemed to help, but it doesnt fix the problem...
do you think i could pass that way? or any other ideas of what it could be?

Andrew
btw, each retest costs 24dollars cdn

Check your basics first.  I went through similar deal with much head scratching on my part.  New plugs, O2 sensor, new carb, etc.  Took emissions test several times.  And finally found low compression on #3 cylinder.  Hadn't thought to check it straight away because engine was only 45,000 miles on last rebuild.

If it has run in a rich condition for very long it will burn the cat out. I've seen a new one get burned out in as short as a couple of miles after being replaced if its running real rich.

Well in that case check the carb float
level, this can make a big difference.

Wild

Spend 12.00 on a rebuild kit, and rebuild the carb...

Ohh, I misread the first post, I though the
carb had been rebuilt, well while your in there,
check the float and the level   if a cheep
plastic float is in there, or the brass ones
have a hole in them, they can sink, and cause
a rich condition, sometimes a fire if fuel leaks
out onto the hot engine

Good Luck

Wild

hmm, i once tried my luck at rebuilding a carb at school  :-/ no luck... but im a few years older now

how would u rate it? easy? hard?... if its tooo complicated i'd probably just pull a vacuum line and see if i coudl pass it like that

and are there good/bad kits? or are they about the same?

thanks, Andrew

For God sake take the easy way out.  Go to your mechanic and ask him for the name of a mechanic who will pass the aircare certification thingy no matter what.  In toronto, there is an entire underground economy based on this provinces DriveClean program.  I couldn't certify my vehicle without spending at least a grand on repairs to the "pollution control devices", but an extra hundred bucks to Oman the Shady mechanic, and I'm set for at least two more years!

Try it.  Black market is good!   ;)Black market is your friend!

lol hahahah, ill look into that one i suppose
i like to fix problems rather than cover them up though
im also not a fan of spending a bunch of money though, so its a tossup

Andrew