Skip the auto shop - Our mechanics make house calls

Q: Mpg going down

asked by on

When i first bought the car few months ago it was giving 38mpg as weeks went pass by it started to get lower and recently i had breathibg filter changed and its gone to 26mpg now. What can be the cause

My car has 137000 miles.
My car has a manual transmission.

A: Hello. If the gas mileage has gotten worse ...

Hello. If the gas mileage has gotten worse since you replaced the air filter you will want to look into that first. It may be installed upside down or improperly. If the air filter is not the issue, then you should check the duct work and air filter housing. If there is a leak and the air pressure and vacuum levels are abnormal, the engine will be confused and run poorly. The spark plugs and ignition system can also have the same effect. When was the last time you had the spark plugs changed? You may want to do this just as normal maintenance, as it will not hurt the vehicle and can only improve the drivability. If the ignition system is working correctly, you will want to make sure your fuel filter and injectors are clean and working correctly.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: my suzuki. Forenza. smokes two colors

Hello. Most of the time when the smoke is blue it is because it is burning oil. If the smoke only occurs when the engine is first started it is typically from the valve stem seals. If it continues to...

Q: Poor gas mileage, sluggish engine. 1995 BMW 318is

Hello there, poor gas mileage is a common issue with the 1995 BMW 318is. In most cases, wider tires are not recommended, but this likely would not drop gas milage significantly. The most likely causes would be spark plugs, coil,...

Q: i'm not getting the fuel mileage I got when I first purchased the car

If your fuel mileage has dropped, first check for any leaks under the vehicle. If there are no visible leaks, then check the spark plugs and see what color they are. If they are burned and white, then the spark...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.