Clogged EGR ports
Exhaust leak before the cat
Lean-biased O2 sensor
Ignition timing too far advanced
Run a few tanks of Techron (or other injector cleaner) through it. Even
better is a few tanks of Chevron high-octane gas. Take it for some long
highway drives to let the injectors work for a while.
Also please post ALL your numbers along with the limits in your area.
Pardon? Are you responding to my reply, but (oddly) in your own original
When you failed smog they would have given you the results sheet that gave
your numbers along with the allowable limits in your region.
It would have looked something like this:
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