Inrecent years, independent research has helped clear up many myths within the Pontiac hobby. One area, however, that still remains shrouded in mystery is the midyear emissions system change that ...

A drive cycle is a standardized test procedure to measure a vehicle's emissions and fuel economy. The test is designed to mimic typical driving patterns, such as city and highway driving, and to ...

In the past two months we've covered most of the emission systems that have appeared on recent automobiles. This month we'll conclude our discussion of these systems with those devices designed to ...

A purge valve is a vital component of a vehicle's evaporative emission control (EVAP) system. Its function is to control the flow of fuel vapors from the fuel tank and evaporative canister into the ...

Engine and emissions problems combined to account for the highest share of maintenance spending categories among used-truck buyers who responded to Overdrive ’s 2021 Truck Purchase and Lease Survey. A ...