Hey everyone, long time lurker, first time poster.

Hoping someone might be able to point me in the right direction on figuring out how to get my '94 E320 back in the good graces of the state of California. 138k on the chassis, with an 80kish engine that replaced the original unit that suffered a catastrophic HG failure (before it was under my care.) Went to smog today and got the bad news - gross polluter. Here are the numbers:

15mph - %CO2 8.5, %O2 0.0, HC Measured 342 (max allowable 57), CO% Measured 9.84 (max allowable.47), NO measured 52 (max allowable 478)

25mph - %CO2 13.8, %O2 0.0, HC Measured 180 (max allowable 32), CO% Measured 1.51 (max allowable.44), NO measured 62 (max allowable 484)

Both were conducted at approx 1600 rpm.

So I'm sky high on HC and CO% at both speeds, but better at more load, and very low on NO in both scenarios.

I'm a pretty accomplished wrench, but beyond clueless at interpreting this data to suggest a repair path. Any ideas would be greatly appreciated.