Bob,

Got a chance to go through my 84 and 85 model year books and those cars were not equipped with EGR. You should have an air pump, but that doesn't do much for NOX. Actually your overall readings look very good, and you wre close on NOX, but we all know that close only counts in horseshoes and hand grenades. It looks like you have some room to tweak up CO a little which will probably reduce HC and maybe NOX. I wouldn't mess with timing except maybe retard it slightly. Your state probably has visual specs on timing that must be met. One thing that has worked well here in Ca. to reduce NOX is to hook the car up to one of those carbon blaster machines. It's like a dialysis machine for cars. You hook the machine up to the car fuel system, draw out a gallon of fuel, add a special additive to the gallon, disable the fuel pump, and run the car at idle for 45 minutes on the machine. If you know what you are doing, there is a less sophisticated way. You can run the car on water injection to clean out the carbon.

Peter

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