Mordo wrote: > HC >CO NOx >standard 2.40 GPM 80.00 GPM 3.00 GPM >mine 0.4208 GPM 5.8560 GPM 3.1568 GPM

Tabe wrote: > Your chart came out kinda funky on my screen, but it looks like > you're failing on NOx.

If Tabe is right, yes, you are failing NOx, but also are way under for HC and CO. Either your combustion temps are way too high (getting high NOx) or you have a leak in your exhaust before the cat. Your numbers look like you are way too lean--which could give you high combustion temps.

So check your exhaust system carefully for leaks, and sniff at your test port before the cat to see what is coming out of your engine.

BTW--nowhere on the Maryland web sites do they state the limits of emissions required. Strange...or maybe not.

Anyway, here in Colorado, the Vanagon falls under "light truck" limits and for my '87 are 4.0 HC, 30.0 CO and 9.0 NOx. My 130,000 mile, well-tuned Syncro passes with 2.13, 20.91 and 5.79. Not to brag, but to compare. If your "standard" numbers are correct, I wouldn't pass in Maryland either. But why does Colorado have 30 CO and Maryland 80? Something doesn't make sense to me.

(We are at 5,000' and so maybe limits are different for that reason.)

Compare with yours of 0.42, 5.86, and 3.16 and you see why I say "too lean."

Richard