Chevrolet Smog

The Vehicle Above Has A Persistant Black Smoke Problem. I Have Replaced About Everything I Can Think Of Short Of The Ecm. Is There A Way...

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

I Know Very Little About Vehicles But A Few Of My Friends Are Somewhat Knowledgeable About Most Newer Cars But Not Really Familiar With The...

Yes To Your Queston About Egr System It Is Fine No Fluff In Either Port Even Fired It Up To Blow It Out Any Other Sugestions Thanks Herb

92 Chev Suburban 122000 Miles Failed Nox Portion Of Ca Smog Replaced Egr Valve Got Worse Results On Retest Could O2 Senser Be The Culpret

Failed Emissions Test Limit Reading Result Hc Ppm 68 142 Fail Co% 0.36 0.53 Fail...

I Have A 1992 K1500 Chevy Blazer That Just Failed Nj State Inspection Because My Hydrocarbon Level Was Way Too High.i Passed Nox And Co%....

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

After A Diagnostic Was Run, A Major Tune-up, Oil Change And New Cat Converter Were Done. Failed Again On Retest. Hc And Co Levels Are Way...

Hello, I Have A 1991 Cherolet S10. The Truck Has 94,000 Miles, Has A Six Cylinder, 2.8 Liter Motor. Five Speed Manual Transmission. I Have...