92 Toyota Corolla Has High NOx Emissions…

Unfortunately, I learned this during a vehicle inspection whereas it failed the emissions portion of the test.

HC and CO were low… no check engine light… cat is new (old had NO catalyst element inside)… new secondary ignition… new distributor assy (pick-up coil broke apart and the windings ended wrapped around the shaft)… new timing belt.

At 175,000 miles, it runs like a champ… I have one additional fact: this particular application came with no EGR valve (its sister car, the Geo Prizm, is configured the same way).

Short of me jacking with the ignition timing or the fuel’s octane level, has anyone had any experience with resolving this type of problem or working with this year model of Corolla?

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