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The mikuni carbs are crap. Id say rebuild it and replace/check all vacume lines. Make sure everything goes to the right place and all.

I also liked your idea of a more modern cat.

I've got a rebuild kit. Hate the thought of replacing all those vac lines, though. This truck has more than my 92 VR4, and none of the diagrams - under the hood, in the service manual, or hand-drawn on this site - seem to be a sure thing. Shame I can't just throw a Weber on it. (No emissions connections means instant fail.)

Have to start thinking about a cat, I guess. Just strange that it would pass emissions with flying colors in 2012, but suddenly fail so bad I have to replace nearly the entire fuel/emissions system before I can barely scrape by this year.

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When my 95 3.0 24V failed for NOX a few years back, I gave thorough Sea Foam treatment for starters (other things tune-up related had been recently done), and left as is until the gas tank ran down. Then chenged to fresh oil, filled the tank to 1/4 with super high octane, added a bottle of octane boost on top. It passed then. No idea how this might help with your CO...

I tested this last time with a bottle of Seafoam in the tank - which was below 1/4. smirk

Not sure how running higher octane would help, though. If anything, it burns cooler due to reduced volatility. I think I need to lean it way out. And maybe replace the cat.

(sigh)

Thanks guys. Appreciate it!

Brian DR1665 | GBXM | Gearheads United.
89 Raider SWB [rock] | 91 Galant VR4 [roller]