Failed Emissions AGAIN

I didn't hear you say anything about your spark plug wires. Could your replacing your plugs have agitated bad carbon filament plug wires and broken the connection even more ?

On my 88 22r I put spiral conductive core plug wires, and brass electrode cap and rotor. Common Carbon Filament plug wires really suck I wish they were never placed on the market.

What did the fuel burn on your old plugs look like ?

How bout your ignition timing ?

Just some guesses.

I didnt replace the wires. But they looked in good shape?

The plugs had carbon deposits on them and one or two had ash deposits, which i discovered with help of the manual and the troubleshooting guide for spark plugs.

Timing has been checked recently and was spot on.

Speaking of fuel burn, my '88 pickup with a 22r has had a black, sooty tailpipe since the day I bought it new. It always passes the California smog test, but it looks bad with the soot in the inside of the tailpipe and about a quarter of an inch on the outside, around the tip. I'm always envious when I see can see the inside tailpipe seam on newer, fuel injected vehicles.

I don't consider that to be tailpipe envy... :>))

With the "rag wires" fiber there is no way to visually inspect them. I think you could get a measurement with an OHM meter but I've not measured those types of wires. They may be way high in resistance making the OHM meter useless.

I just thought if your measurement of CO got worse, suspect the wires because the Carbon filament gets brittle and likes to brake.