Chevrolet Silverado Smog

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

I Would Like To Install Headers On The Truck.can I Delete The Cat Converter, I Live In Montana There Are No Emissions Tests.

Computer Problem 1997 Chevy Silverado V8 Four Wheel Drive Automatic Smog Test Says Low Voltage To All 4 O2 Sensers

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....

I Have No Catalytic Converter And A Glasspack For Exhaust. (no Longer Required To Emission Test). Now Can I Disconnect The Oxygen Sensor And...

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...