![]() RELATED: 6 Symptoms of Bad Spark Plugs 4. ![]() These issues can also lead to engine hesitation, stumbling, and a rough idle. However, this is true with any part of the ignition system, including the plug wires and ignition coil.įuel that hasn’t burned can’t be used to move the vehicle, so it goes wasted. If a spark plug goes bad, fuel in the affected cylinder might not combust properly, leading to poor gas mileage. The ignition system is vital to the combustion of the engine, and the spark plugs play a huge role. RELATED: 5 Symptoms of a Bad Oxygen Sensor 3. It can also increase the CO levels in the exhaust, hurting the environment. If there is a defective sensor, there could be more fuel being injected into the system than needed, which means you’re wasting gas. Many times, the car will continue to run normally or with some minor performance issues, even with a bad sensor, but you don’t want to ignore the fault. If the Check Engine Light comes on and reveals a bad O2 sensor, you want to replace it right away. Let your engine breathe better and increase the fuel economy, all with this simple replacement. In fact, you are probably spending more money by running the dirty air filter than it would cost to change it. For the cost of a new air filter, there’s no reason to procrastinate. If you can’t remember when it was changed last, it’s time to fix that. If you check the recommended service intervals for your vehicle, you will see engine air filter replacement listed. ![]() Dirty Air FilterĬhanging the engine air filter is considered a regular maintenance task. Without further ado, here is a more detailed list of the ten reasons your car isn’t getting great gas mileage. You also want to ensure you use the right fuel type with the right octane rating for your car. It can also be caused by a dirty air filter or low tire pressure. The most common cause of poor gas mileage is a faulty engine sensor like the O2 sensor, MAF sensor, or MAP sensor. Best Way to Improve Gas Mileage 10 Causes of Bad Gas Mileage ![]()
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