Can Mass Air Flow Sensor Make Your Car Run Rough 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 suddenly drops fuel economy after a routine oil change, several things can happen. It is important to correct the problem immediately to prevent damage to engine and exhaust components. Many cars will not experience any loss of power or other symptoms at all when mileage drops unexpectedly.

1. Start by manually checking the fuel mileage in multiple fuel tanks. The onboard computer’s mileage readings are useful, but they’re consistently off by about five to seven percent. Measure the mileage by filling the tank only to the point where the pump stops. Turn off your odometer. At the end of each tank of fuel, record the mileage and reset the odometer to zero. Fill each tank only until the pump stops each time. Divide the miles driven 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 calculations like this, you will eventually have a decent average for your car’s mileage. It is helpful to do this before and after an oil change so you know you are comparing the mileage after the oil change to the actual mileage before the change.

2. The mechanic may have used the wrong type of oil for your vehicle. The differences between the oils are 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 dealer actually changed the oil filter instead of reusing an old, dirty one. Make a mark on the old filter with a marker before you take the car in for an oil change, then check to see if the old filter has been replaced.

4. Check the oil level with the engine dipstick. Often, oil change franchises get overcharged during quick oil changes. This causes the crank to become flooded with oil and can also cause 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 MAF Sensor Cleaner on the MAF when the car is not running. The vehicle may run rough for a few seconds after cleaning. This is normal as the motor processes the remaining spray.

6. Take the car to a trusted mechanic and have the PCM scan for faults. Sometimes the temperature sensors are disconnected or damaged, which causes a decrease in fuel consumption. Oxygen sensors and engine coolant temperature sensors can become disconnected during an oil change, which can cause the engine to run like it’s always cold and needs more gas. Sometimes the vacuum lines may have disconnected from the air filter as well.

7. After changing the oil, check the tire pressure. Many franchises and oil change dealers offer additional tire pressure adjustments as part of the service. This can have a significant impact on fuel consumption.

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