Help with emissions numbers

[ozzyleven]

So as part of my warranty stuff for the new 22re I had to have a 4-gas analysis done. I live in Montana and don't have to deal with this crap usually, so I have no idea what these numbers really mean. I was told the the truck is running a little rich.

Here are my numbers:
HC - 916 ppm
CO - 1.09%
CO2 - 104.6%, 2-10%AVG
NOX - 66 ppm
At idle after 15.4 (not sure what this means?)

They said my o2 is working and they think it might just be an old cat (it 18 years old). Anyways, how is my engine running? Is there a problem I should even look for? Timing is good, plugs, rotor, o2 are new.

 

[CodeButcher]

So as part of my warranty stuff for the new 22re I had to have a 4-gas analysis done. I live in Montana and don't have to deal with this crap usually, so I have no idea what these numbers really mean. I was told the the truck is running a little rich.

Here are my numbers:
HC - 916 ppm
CO - 1.09%
CO2 - 104.6%, 2-10%AVG
NOX - 66 ppm
At idle after 15.4 (not sure what this means?)

They said my o2 is working and they think it might just be an old cat (it 18 years old). Anyways, how is my engine running? Is there a problem I should even look for? Timing is good, plugs, rotor, o2 are new.

Everything is 10 times what is considered normal, except you NOX is pretty average. You might want to get a new CAT. I think a new CAT will drastically reduce those numbers.

 

[ozzyleven]

So, one thing I'm trying to figure out is how you can have 104% CO2? Wouldn't that be impossible? I didn't get a printed out thing from them. More like somebody typed it into the comments section of my statement. I'm starting to wonder if someone screwed up the info. Or if they even warmed up the truck before running the test. It doesn't smell rich at all. Getting good mpg. I guess it could be the cat, but you would think if the cat wasn't working (apparently not at all really according to these numbers) I'd be getting an o2 code...

Also, before I jump in and blow a bunch of money on a new cat, what other things should I check to get these numbers down?

 

[CodeButcher]

Usually when the HC are so high means the Cat is no longer working properly. Normal HC should be below 100 ppm. I'm California, and we have some of the strictest emission standards. How often do you change your oil?

Your CO2 (Carbon Dioxide)number may be wrong. You might want to recheck that. The CO (Carbon Monoxide) number is double.

How cold was it when they ran the test? It is possible that the CAT never got hot enough, but after 18 years, I think it's time to change it.

My 86' PU, had high numbers before I replaced the CAT. The CAT was so clogged it would Diesel going up a hill. Tough it rev'd fine if no load was on the engine.