In addition, any brake issue can make the vehicle dangerous to drive. Stuck Brake Caliper: A stuck caliper on a disc brake or a stuck shoe on a drum brake can lead to a serious decline in gas mileage. Fuel filters need to be replaced periodically. The fuel filter screens out contaminants in the fuel, and over time it will become clogged. It is now 2011, I have 208,000 miles on it and she purrs like a kitten for the most part. If this issue is not addressed it will lead to a rough, idle, sputtering and stalling.Ĭlogged Fuel Filter: A clogged fuel filter will also cause problems with gas mileage. I purchased my 2005 Chevy Cobalt with 12 miles on it in February 2005. This will lead to a decline in gas mileage. A bad fuel pump can lead to a rough running engine because it is not getting enough fuel. The fuel pump can become clogged or malfunction. The fuel pump pulls fuel from the gas tank to the fuel injectors. Checking the tire pressure and have the alignment checked on regular basis can help prevent this problem.ĭefective Fuel Pump: Fuel delivery issues can drastically affect fuel efficiency.
Misaligned Tires: Tires that are low or out of alignment can lead to a drop in fuel efficiency. A dirty airflow sensor will degrade fuel efficiently and lead to a rough idle and even stalling as the problem progresses. It delivers that information to the vehicle's computer, which crunches the numbers and then delivers the proper amount of fuel to the air in the vehicle. Malfunctioning Mass Airflow Sensor: A mass airflow sensor detects the amount of air coming into the fuel injection system. Compare the 2011 Chevrolet Cobalt with other model years. This can lead to a lack of power as well as a big decline in fuel efficiency. Note that the number of problems reported for the 2011 Cobalt is 2 while the average number of problems reported for the 14 model years of the Chevrolet Cobalt is 671. If they are dirty or working incorrectly, it can cause the engine to misfire, leading to poor engine performance. As it progresses, the injectors may have to be replaced.īad or Dirty Spark Plugs: Spark plugs ignite the fuel in the combustion chamber. If caught early, simply cleaning the injectors can solve the problem. This can lead to a drop in fuel efficiency as well as slow acceleration and the car not having enough power. Over time the fuel injector system can become clogged. It can also lead to failed emission tests and a rough idle.ĭirty Fuel Injectors: Fuel injectors spray fuel into the cylinders where it is mixed with air and ignited. If the sensor is dirty or failing it can lead to a drop in miles per gallon. The data is used by the vehicle computer to adjust the amount of fuel entering the engine. Service type Car is getting worse gas mileage Inspectionĭirty Oxygen Sensor: An oxygen sensor measures exactly how rich or lean the exhaust gases are when they leave the combustion chamber.
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