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Another clue to if a high NOX reading is a result of a bad Cat-Con is that there is also a fairly high, yet still passing level of CO reading, as a properly working cat-con is using the CO to convert the NOX back into Nitrogen by stripping the O from it and converting the CO into CO2.

ANY exhaust leaks above the cat-converter need to be repaired. An example would be a gasket that's blown, or a cracked manifold or head pipe. Air getting into the exhaust stream can ignite the CO before the Cat-Con can use it to convert the NOX.



Nice to know. Thanks, Marty.

THe 2.6 has a thermo vac switch, the bakelite thing on the water neck, sticks out toward dside, and every Monty I've ever seen has one nipple broken off, at least one.

Ditto the ported vac on egr. You can spot the ported vac by testing the vac nipples for vac at idle, and finding the ones with out strong vac at idle, then blip the throttle and see which ones have strong vac as the throttle blade opens past the port.

I'd never put on a weber in a emistest state... For that matter, I wouldn't put on a weber in any case unless I was going to use two of them on a new mani.

Not responsible for advice not taken...