How high is the Hydrocarbon (HC)?
Got
new air filter?
Clean carbon off the EGR passage tube and back side of EGR valve.
This will lower the Nox
Clean/ change PCV.
Ran a tank of gas with Lucas fuel system cleaner.
Do a heavier grade oil change right before the test.
Example: if you use 10W30 then use 10W40.
Keep the engine HOT right before the you pull into the smog machine.
The jets on the carb may need to be tuned,also check the metering rods,you might be getting to much fuel not enough air,
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