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Would a bad mass air flow sensor and a bad fuel pump have the same result

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  • Cars & Trucks Master
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They could.
Either one could affect the amount of fuel going into the cylinders.

Posted on Jul 18, 2013

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Posted on Jan 02, 2017

SOURCE: 92 ford ranger

check your vacuum lines if one is off then it will do that too.

Posted on Jun 29, 2008

  • 1 Answer

SOURCE: car will not start when

hi there, when air flow unplugged, ecu goes into limp home mode ,a back up if something dies whilst driving. it sounds as if your used mass air flow sensor is faulty , they are more fragile than they look, one knock and these early fine wire models are gone. i replaced many when i worked at a volvo dealership a few years ago. hope this helps, and good luck.

Posted on Aug 11, 2008

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SOURCE: car runs rough at idle

clean out ur throttle body, just follow the hose from the air filter to the throttle body. Need 2 people to do this. Don't remove the hose completely from the throttle body. Just enuff to be able to spray ur intake cleaner into the throttle body. Do this especially if its worse when the motor is hot, as this would confirm the problem.

Posted on Sep 04, 2008

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SOURCE: changed fuel pump,coil and ignighter,mass air flow,computer,relays and still wont crank

it could be yes easily

Posted on Jan 30, 2009

  • 39 Answers

SOURCE: mass air flow sensor bad on 2002 monte carlo ss

It's should be a simple remove and replace. Just make sure the engine is off. Also do not touch any of the filament wires on the sensor, just the plastic housing. Also after you install it drive the car for a little while (city speeds, cruising speeds and inbetween). That way the computer will be able to readjust its setting since it is a new sensor.

Posted on Apr 02, 2009

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My 2003 Astro van has been running fine the I got gasmonday night and as I pulled out the gas station it spit and sputtered like I got bad gas or trash in filter, then it started working fine.


Mass air flow sensor maybe drity or going bad . Ever had it replaced ? Have you replaced the air filter lately ? Video's on youtube showing how to clean mass air flow sensor , you would have to buy a can of mass air flow sensor cleaner . Also while your at it clean the throttle plate , again there are videos on youtube . How did you check fuel pump ? To do it right you would need to hook up a pressure gauge . Also check flow .Videos on youtube .Has the check engine light come on ? Also you mite try some fuel injector cleaner and or dry gas for moisture in the fuel !

Mar 15, 2017 | Cars & Trucks

1 Answer

Crank but no start, mazda mpv 2001


Check cylinder compression and post results.

Jul 05, 2015 | Mazda MPV Cars & Trucks

3 Answers

2003 Nissan Altima 2.5L Service Engine Soon Light is on, Auto Zone says codes are for MAF and O2 Sensors. Car hard to start after driving a while but when starts appears to run smooth. Auto Zone thi


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

Oct 22, 2014 | 2003 Nissan Altima

1 Answer

2003 Hummer H2 - Check Engine Light- P0171 and also been leaking/losing coolant a lot lately! Could the two issues be related or separate problems?


Fuel system too lean (too much air, not enough fuel) vacuum leaks being the most common, you might want to check for a bad airflow sensor, plugged fuel filter, clogged fuel injectors, low fuel pressure, exhaust leaks, a bad PCV valve, bad oxygen sensor, stuck open purge valve. mass air flow (MAF) sensor are fairly common too. Sometimes the mass air flow sensor just gets dirty and gives false air flow readings.

Dec 09, 2013 | Cars & Trucks

1 Answer

Car sputters and stops


Hi there:
You might want to change the fuel filter, it may have been clogged by sediment picked up from the tank when it was ran low on fuel.

Also, you could have a bad mass air flow sensor or the snorkel from the mass air flow sensor to the throttle body could be ripped. Both are very common and can cause you vehicle to loose power along with many other drive ability issues.

First look for cracks or rips or anywhere air can enter the engine that is not accounted for by the mass air flow sensor. Next comes the Mass Air Flow (MAF) sensor. This is a very important sensor input to the computer. It uses a hot wire sensing element to measure the amount of air entering the engine. The MAF sensor then outputs an analog voltage signal to the PCM proportional to the intake air mass. The PCM calculates the required fuel injector pulse width in order to provide the desired air/fuel ratio. If the sensor is bad than this air/fuel ratio will be off causing severe performance issues. In extreme cases, I have seen these two problems cause a no start condition. This input can also be used in determining transmission Electronic Pressure Control, shift and torque converter clutch scheduling.

The check engine light may even pop on if the sensor is bad, the snorkel is ripped or a tube has fallen off, this will result in a lean condition. Scanned the computer.

Hope this helps; also keep in mind that your feedback is important and I will appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

Dec 20, 2011 | Chrysler 300M Cars & Trucks

1 Answer

Using large amounts of fuel


First off, this sounds like a mass air flow sensor problem or an oxygen sensor problem. Other things to consider are fuel line leaks at connections. Your fuel pump might even be faulty. I would first start looking at the spark plugs to see if they are fouled and replace them if they are real bad. Most of the time the oxygen sensors or mass air flow sensor are messing up, improper gas and air mixtures cause rough acceleration and poor idling as well.

Jan 28, 2011 | 2004 Mitsubishi Outlander

1 Answer

My 87 944s has been setting in the garage for 2 weeks without being driven aand now it will not start. It sounds like it is not getting gas. what do you think I should do? Big C.


Take off the rubber intake boot between the air filter & the Mass air flow sensor.Take a screwdriver and open the air door in the Sensor. This will activate the fuel pump when the ign key is turned to the on position. Do you hear the fuel pump? If not check the fuel pump fuse and relay over the drivers left leg area. You may have to bypass the relay by connecting the #30 post with the #87 post. If no results, bad pump.

Jan 12, 2010 | 1987 Porsche 944

1 Answer

I have an 89 voyager that hesitates when applying gas at take off


these go from most likely to least likely

Priority Action Part Type Cause
1 Inspect Throttle Position Sensor Faulty or Incorrectly Connected Throttle Position Sensor.
2 Inspect Mass Air Flow Sensor Damaged, Loose, or Faulty Mass Air Flow Sensor or Circuit.
3 Inspect Choke Thermostat Stuck or Improperly Functioning Choke Thermostat.
4 Inspect Air Cleaner Tempature Sensor Damaged or Faulty Air Cleaner Tempature Sensor.
5 Inspect Fuel Filter Clogged or Dirty Fuel Filter.
6 Inspect PCV Valve Plugged or Damaged PCV Valve.
7 Inspect Carburetor Worn, Faulty or Damaged Carburetor.
8 Inspect Fuel Injector Dirty or Worn Fuel Injectors.
9 Inspect Hose (PCV)at Clogged or Collapsed PCV Hoses.
10 Inspect Fuel Pump Faulty Fuel Pump.
11 Inspect Fuel Pump Low Fuel Pressure.

Aug 31, 2009 | 1989 Plymouth Voyager

4 Answers

I own a 1997 Pontiac Bonneville my check engine light is on when I got the codes read it said that I had an bad O2 sensor and my mass air flow sensor is bad. My car cuts off on my while I am driving could...


yes the mass air flow will cause the oxygen sensor to have bad readings cause it don't tellthe cumputer to mix the right amount of gas it throughs the whole balance off..i would fix these and see from there...hope i helped..

Jul 09, 2009 | 1997 Pontiac Bonneville

1 Answer

My vehicle just shuts off while im diving, it pulled codes p0453


They might be refering to the MAP Sensor. A manifold absolute pressure sensor (MAP) is one of the sensors used in an internal combustion engine's electronic control system. Engines that use a MAP sensor are typically fuel injected. The manifold absolute pressure sensor provides instantaneous manifold pressure information to the engine's electronic control unit (ECU). This is necessary to calculate air density and determine the engine's air mass flow rate, which in turn is used to calculate the appropriate fuel flow. (See stoichiometry.)
An engine control system that uses manifold absolute pressure to calculate air mass uses the speed-density method. Engine speed (RPM) and air temperature are also necessary to complete the speed-density calculation. Not all fuel-injected engines use a MAP sensor to infer mass air flow; some use a MAF (mass air flow) sensor. Several makes use the MAP sensor in OBD II applications to test the EGR valve for functionality. Most notably General Motors uses this approach.
Contents How the MAP value is used The manifold absolute pressure measurement is used to meter fuel. The amount of fuel required is directly related to the mass of air entering the engine. (See stoichiometric.) The mass of air is proportional to the air density, which is proportional to the absolute pressure and inversely proportional to the absolute temperature. (See ideal gas law.) Engine speed determines the frequency, or rate, at which air mass is leaving the intake manifold and entering the cylinders.
(Engine Mass Airflow Rate) ˜ RPM × (Air Density) or equivalently (Engine Mass Airflow Rate) ˜ RPM × MAP / (absolute temperature) They could also be refering to the fuel pressure sensor. If so, then yes this also can cause the problem. You shoud have your fuel pressure checked for about $34.00. If you have a bad fuel pressure regulator you will need to change it out. If it remains undelt with then it could take out your fuel pump. Most fuel pumps are located and installed in the top of your fuel tank and are submerged into your tank. It needs the fuel to keep it cool, but if you continually keep your fuel under 1/4 of a tank you will drastically reduce the life of your fuel pump. Fuel pumps can be expensive to replace. I replaced my wifes in her 1997 Chevy Blazer and it cost me $350.00 (lifetime warrenty). If you keep your gas under a 1/4 of a tank most of the time and your pump is found to b bad then you need to opt for the LIFETIME replacement pump. You only want to have to pay for the pump once, believe me. Otherwise you really haven't provided enough of the symptoms to go on. Does it shut off when you are at speed, or stall when at a stop? If it stalls when you come to a stop you could have bad Oxygen sensor(s). If it's the oxygen sensor(s) then you should replace all of them.

These are merely suggestions.
Good Luck!

Mar 14, 2009 | 2001 Oldsmobile Bravada

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