Overreving with no power and excessive gas consumption air filter cleaned map sensor replaced fuel pump and filter

Some possible causes could include:

1. A malfunctioning oxygen sensor: The oxygen sensor measures the amount of oxygen in the exhaust and sends this information to the engine control module. If the oxygen sensor is faulty, the engine may run too rich or too lean, which can result in excessive fuel consumption.
2. A clogged air filter: A clogged air filter can restrict airflow to the engine, causing it to work harder and use more fuel.
3. A faulty fuel pump: If the fuel pump is not working properly, it may not be delivering an adequate supply of fuel to the engine, causing it to consume more fuel in order to compensate.
4. A leaking fuel injector: A leaking fuel injector can allow fuel to escape from the engine, leading to an increase in fuel consumption.

To determine the cause of the excessive fuel consumption in your Mazda Demio, it is best to have it diagnosed by a mechanic. They will be able to perform tests and inspections to identify the problem and suggest the appropriate repairs.

check the cat converter is not blocking the exhaust and upsetting the oxygen sensor readings

Hello, There are several causes for excessive fuel consumption . Dirty or clogged air filter, leaking gas hose or fuel lines, under inflated tires, wrong sized tires, excessive weight in the trunk, a heavy foot on the gas pedal are only a few.

ok lets start with the codes they say your getting. P??? which 1's and how many. there are few o2 sensors, are they next to the Exhaust next to the converter? MASS AIR FLOW -MAF use this, for now i am guessing, until i see the correct codes your are getting. this could be the 1 you may have below, please read it........

• P0103
  Mass Air Flow Sensor Circuit High Input
• Possible causes
• Faulty mass air flow sensor
  - Intake air leaks
  - Dirty mass air flow sensor
  - Dirty mass air filter
  - Mass air flow sensor harness is open or shorted
  - Mass air flow sensor circuit poor electrical connection
• Before replacing the mass air flow sensor, try replacing the air filter and cleaning the air flow sensor with low compress air or mass air flow sensor cleaner. Reset code and drive vehicle. If the code comes back, it may be necessary to replaced the mass air flow sensor.
• possible symptoms Engine Light ON (or Service Engine Soon Warning Light)
  - Engine stall
  - Engine running rough
  - Excessive fuel consumption
  - Excessive smoke
• the code is generated when An excessively high voltage from the sensor is sent to Engine Control Module (ECM).

2003 NISSAN Altima Sedan OBDII Codes List

Only the air filter would come into play, if you
have created vacuum leaks in the ducting & thru
unmetered air

Maybe unrelated issues you have there before

The upstream O2 Sensors could be replaced at
100,000 miles & you could look at fuel trim on a
road test

Need new spark plugs every 3 years

Clean the MAF Sensor

EXCESSIVE FUEL CONSUMPTION CAUSED BY CLOGGED AIR FILTER.LOW TIRE PRESSURE,FUEL INJECTORS CLOGGED AND DIRTY.RUNNING AIR CONDITIONER ALL TIME BURN MORE FUEL.CITY DRIVING STOP AND GOING PUTTING CAR IN MOTION NEED GAS HORSE POWER MOVE CAR. FAST DRIVING.TUNE UP WILL HELP. BAD SPARK PLUGS AND WIRES.WEAK FAULTY COILS CAUSE FUEL CONSUMPTION.

P0172 - Fuel Injection System Too Rich Bank 1 Symptoms - Engine Light ON (or Service Engine Soon Warning Light)
- Excessive Fuel Consumption Possible causes - Intake air leaks
- Front Heated oxygen sensor may be faulty
- Injectors may be faulty
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Mass air flow sensor may be faulty
- Incorrect PCV hose connec Possible solution Dirty air filter of faulty air flow sensor are common causes of the problem.

P0174 - Fuel Injection System Too Lean Bank 2 Symptoms - Engine Light ON (or Service Engine Soon Warning Light)
- Excessive Fuel Consumption Possible causes - Intake air leaks
- Front Heated oxygen sensor may be faulty
- Injectors may be faulty
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Mass air flow sensor may be faulty
- Incorrect PCV hose connection Possible solution Dirty air filter of faulty air flow sensor are common causes of the problem. Bottom line possible defective Mass airflow sensor and or O2 sensor in cylinder bank number two.

the MAP ( Manifold Air Temperature ) its data is used to control fuel ratio / NOT THE DELIVERY OF FUEL Did you check the FUEL FILTER ?

Hi, your car may need a tune up, tire air presure, tire size,cloged injectors,dirty air filter, fuel filter,bad oxigen sensor, all those can affect your gas consumtion. (start by checking the easyst ones first) good luck......