Damn it, i was so close too. I failed CT emissions for too much CO (Carbon Monoxide)
Now does this mean im running too rich, or too lean?
I have an adjustable fuel pressure regulator, so i wanna play w/ that. Any suggestions?

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Do you still have the AIR injection on your car? I don't and kept failing the CO test. What I eventually did was drop the fuel pressure to about 38 psi and put new spark plugs in (even though the ones in there were only about 10 months old). I also put a bottle of that ISO-HEET fuel line dryer/antifreeze in about a 1/4 tank of gas. I heard that this may help so I tried it. After doing all this, I passed easily. Oh yeah, make sure your car is running hot when you get it tested. The hotter the better. Just make sure it doesn't overheat.

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1991 Z28 - 350 TPI, T56, McLeod street clutch, ported plenum & runners, AFPR, Holley Annihilator ignition box and wires, Hooker shorty headers w/o AIR, Flowmaster muffler, homeade ram-air, SSM subframe connectors, Kenny Brown STB, Global West steering box brace, Steve Spohn adjustable torque arm and T56 crossmember

 

I don't have my AIR pump connected to the manifold either. I failed the first time b/c of CO. Since I still have the pump on the car I connected it directly the line that goes to the cat which basically pumps fresh oxygen into the exhaust and I passed. Simple but it worked.
Thougts?

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89 GTA G92
305 TPI WC 5spd w/3.45
Accel Cap & 8mm Taylor's
Custom 4" Cold Air Induction
Jet Airfoil
K&N Airfilter
160 deg stat/fan switch TB Bypass - Steel Rad
Cat back 3" Exhaust w/Terminator Muff.
HiGh FlOw Dynomax Cat
Spohn LCA's - KYB GR-2's
Moroso Crank Bolt and roller pilot bearing.
Autometer Vac+Oil Temp

 

Try retarding your timing a few degrees if you only failed by a little bit. Otherwise it's probobly your cat.

 

Assuming your emission equipment is hooked up play with your timing and fuel...could be the cat

 

Too much CO? How old is your air filter? Try a new one in there anyway.


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-Tom P (Hot rodded 1986 Firebird 2.8l) from http://www.f-body.net/mailbag/3rd/3rd_mailbag.html message boards
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Too rich - The engine needs more air in order to fully burn the CO and oxidize it into CO2.