Rep Power: 322

My other car is a 94 Grand Cherokee I-6 2x4 with 197xxx miles
So I failed the CA smog test.
I passed the visual and functional check but failed the emissions.
I failed the NO part.
The cat was replaced maybe 5 years ago when it failed smog.
Only thing wrong with the car is a small crack in the intake manifold.

Can anyone with experience looks at my test results and give me some advice as to what I should be fixing?
Thanks

15mph / 25mph

co2
Meas: 14.4 / 14.6

o2
Meas: 0.5 / 0.3

hc (ppm)
Max: 87 / 52
Ave: 19 / 12
Meas: 81 / 55

co
Max: 0.63 / 0.76
Ave: 0.06 / 0.05
Meas: 0.18 / 0.09

no (ppm)
Max: 504 / 757
Ave: 136 / 124
Meas: 1012 / 856

 
Rep Power: 281

Just get your hands on some jet fuel and run it for a smog test.. it should pass :-D dont ask me how i know that.

 
Rep Power: 0

You also failed the HC at 25. I would say get a new cat, they help alot when brand new, but you failed by big margin.

 
Rep Power: 304

I'd try a new o2 sensor first. Also, NO gets higher with engine heat. Make sure it cools properly. Lastly, when's the last time you did a proper tune up? Plugs and wires can also make HC go up. And, belive it or not.... dirty oil.