Chevrolet Silverado Smog Fail

My Truck Is The Extended Cab Model. Runs Normal. Need Emission Inspection For New Tags. Failed Catalytic Converter - Pass Po430 -...

Wont Pass Smog Code P0430. I Found A Vac Hose That Was Not Connected To Anything But Dont Know Where It Goes Because Part Of It Is Missing....

My Truck Won't Pass Smog Says Its A Gross Politer

What Would Cause My Truck To Measure 133 Hc (ppm) And 1033 No (ppm) And Fail Emissions

Supposing 1 Of 3 Previous Owners Changed The Ecm But Got The Wrong Chip (say Out Of A Junkyard 7.4l) Now Causing Excess Fuel Injection...

1st Test 522 Ppm Hc (limit 220) 5.41 Co% (limit 1.2), Co2% 11.5, O2% 0.1; High Idle Ok At 43ppm Hc, Co% 0.01, Co2% 13.6, O2% 1.4; Always Ran...

New Exhaust Pipes, New Catalytic Converters(2) Went To Inspection For Emissions Test.failed Hydrocarbons And Canon Monoxides. Mechanic...

I Failed The Emissions Test The Max Reading For Nox Is 4.5 I Failed With A 4.59. The Truck Had Been Parked For Aver A Year. I Put Some New...

2nd Of 2 Smog Test: @ 15mph/rpm-1012, %co2/meas-11.9, %o2/meas-0.3, Hc(ppm)/max-133, Gp-321, Meas-285, Co(%)/max-0.89, Gp-2.19, Meas-4.53...