CHEVROLET SILVERADO EMISSION

Vent Valve High Circuit Code P0446. Replaced Vent Valve Fixed For About A Month. Now It Is Throwing The Same Code. When You Open The Gas Cap...

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...

Greetings-new Question I Partially Rebuilt A 1992 4.3 That Was In My 89 Chevy Pu. New Valves #1 Cyl, Reset All Other Valves, Honed Cyls...

I Am Getting A P0449 Engine Code Evap Vent Vlv/ Sol Malf. Every Thing I Have Read Says To Clean ( Blow Out Sol. )Check Plug Connection Or...

This Has Happened Twice. Once 6 Months Ago, I Was Leaving Work And Cranked My Truck, Backed Up, Put In Drive And Started Forward And It...

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;...

Hello, First Of All Thank You For Offering This Website. I Am A Single Mom, And Dont Know Much About How To Fix Cars, And Cant Afford To...

Truck Started Fine This Morning. Ran For 5 Or 10 Min, Then Started Missing Real Bad. It Will Restart, But Hardly Runs. It Just Kind Of...

What Do I Need To Do To Pass My Truck For Emissions If My Hc Is 133 And My No Is 1033. Ive Changed My Egr Valve, My Vacuum Isnt Leaking And...

03 Chevy Silvarado 5.3. Can The Evap Purge Valve Cause A Lean Mixture Code? My Truck Has No Egr Valve. My Guess Is The Purge Valve Took It...