A vintage 1972 vehicle equipped with a carburetor (open-loop control) was also examined. A turbocharged inline 4-cylinder gasoline direct injection (GDI) engine powered vehicle was the fourth modern gasoline vehicle tested. Three vehicles were powered by naturally aspirated, port fuel injection (PFI) engines of differing size and cylinder configuration: an inline 4, a V6 and a V8. Four of these were modern vehicles, featuring closed-loop control and ranging in model year from 2003 to 2007. The effect of clogged air filters on the fuel economy, acceleration and emissions of five gasoline fueled vehicles is examined. Older studies, dealing with carbureted gasoline vehicles, have indicated that replacing a clogged or dirty air filter can improve vehicle fuel economy and conversely that a dirty air filter can be significantly detrimental to fuel economy. This effort investigates the effect of one maintenance factor, intake air filter replacement, with primary focus on vehicle fuel economy, but also examining emissions and performance. Proper maintenance can help vehicles perform as designed, positively affecting fuel economy, emissions, and the overall drivability. The results reveal rather low sensitivity of these modern diesel vehicles to air filter condition. The vehicles were powered by turbocharged diesel engines with different displacements and engine designs. The effects of clogged air filters on the fuel economy, acceleration, and emissions of three late model turbocharged diesel-powered vehicles were examined. Because modern diesel engines operate without throttling (or with minimal throttling), a different result could be anticipated. In contrast, a recent study showed that the fuel economy of modern gasoline vehicles is virtually unaffected by filter clogging due to the closed loop control and throttled operation of these engines. Older studies of carbureted gasoline vehicles have indicated that replacing a clogged or dirty air filter can improve vehicle fuel economy and, conversely, that a dirty air filter can be significantly detrimental to fuel economy. Described are measured results for increasing air filter pressure drop in turbocharged diesel-engine-powered vehicles, with primary focus on changes in vehicle fuel economy but also including emissions and performance. This paper addresses the issue of whether air filter replacement improves fuel economy. Proper maintenance can help vehicles perform as designed, positively affecting fuel economy, emissions, and overall driveability. The biggest differences were measured under extreme conditions when the air filter had been almost fully clogged, or the air had been delivered into the engine under pressure. The results from this article show a relatively low impact of air filter on the features studied. The importance of the article lies in quantification of the impact of clogged air filter on selected vehicle features. For higher result objectivity, the measurements haveīeen done under some extreme conditions as well, with both the air filter fully clogged and forced air induction. The measurements have been performed under laboratory conditions. The article pays attention to the impact of clogged air filter on selected vehicle characteristics including a vehicle’s dynamic features, fuel consumption and composition of the exhaust gases. It can further degrade the vehicle’s ability to accelerate and, therefore, have an impact on road driving safety, or it can eventually make a vehicle performance worse or cause a change in the exhaust gas composition. Thus, there is a conditionįor air mass delivered into the engine’s cylinders to be reduced.
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