What To Use To Clean A Mass Air Flow Sensor What Happens When Your Car Gets Worse Mileage After An Oil Change

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What Happens When Your Car Gets Worse Mileage After An Oil Change

When a normally reliable vehicle experiences a sudden drop in gas mileage after a routine oil change, several things can happen. It is important to fix the problem immediately to prevent damage to the engine and exhaust components. Many cars won’t even experience loss of power or other symptoms when their mileage drops unexpectedly.

1. Start by manually checking the fuel mileage in several fuel tanks. The on-board computer’s mileage reading is useful, but consistently errs by about five to seven percent. Measure the mileage by filling the tank only to the point where the pump stops. Remove the odometer to zero. At the end of each tank of fuel, record the mileage and reset the counter to zero. Fill each tank only until the pump stops. Divide the miles traveled per tank of fuel by the number of gallons added at the next fill-up. This is your fuel mileage for the tank just used. After a few such calculations, you’ll have a decent average over time of the mileage your car has earned. It’s helpful to do this before and after an oil change, so you know you’re comparing the mileage after the oil change to the actual mileage before the oil change.

2. The mechanic may have used the wrong type of oil for your vehicle. Oil differences consist in viscosity, engine protection, formula stability and engine oil longevity. You may need to take the car to your regular mechanic and have the oil and filter changed again with the correct type of oil.

3. Make sure the franchise or oil change dealership actually changed the oil filter instead of reusing the old, dirty one. Make a mark on the old filter using a marker before you take the car in for an oil change, then make sure the old filter has been replaced.

4. Check the oil level using the engine dipstick. Oil change franchises often get crowded during quick oil changes. This leaves the crankshaft flooded with oil and can also result in a flooded catalytic converter.

5. The mass air flow (MAF) sensor measures the air entering the engine. It may be dirty and not cleaned during the oil change process. Simply spray the MAF sensor cleaner onto the MAF while the car is not running. The vehicle may run rough for a few seconds after cleaning. This is normal as the engine processes the remaining spray.

6. Take the car to a trusted mechanic and have the PCM scanned for faults. Sometimes the temperature sensors are disconnected or damaged, causing a drop in fuel consumption. The engine’s oxygen sensors and coolant temperature sensors can shut off during an oil change, which can make the engine run like it’s always cold and need more fuel. Sometimes the vacuum lines have also separated from the air filter.

7. Check the tire pressure after changing the oil. Many oil change franchises and dealerships offer a complementary tire pressure adjustment as part of the service. This can greatly affect gasoline consumption.

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