Originally Posted by 666bonne
Nothing like waiting to the last few days to smog bonne. took car in for pre-test, tech says[ what for] these cars always pass smog.guess what it failed the nox-1101ppm limit is785ppm.the hc 2ppm limit 114ppm must be 95throttle body bypassing too much air.I going to try 100 octane fuel and back off bypass valve to delay boost . this will cool combustion to lower nox. I talked to a smog tech at pontiac dealer he told me to make sure they the smog techs, take the traction control off before the roller test so it does'nt apply brakes.this puts drag on testings increasing combustion heat .If this doesn't work I have the AFC-2 coming in mail this week or put 92 throttle back on the 95blower and use lots of silicon. monday or tues I'll be back to smog again
has it occurred to you that the reason you failed is because you are running a smaller pulley and a highflow cat? The smaller pulley will DEFINATELY cause you to burn leaner and add to the mix that your cat is not as effective as the stock one. My opinion. When getting smog tested, switch back to the stock pulley and stock cat. Any exhaust shop SHOULD be able to weld in flanges for the cat, so you can go back and forth at your leisure.