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What will happen if I unplug the mass airflow sensor

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The check engine light will come on if it is not already.
The computer will substitute a value for the reading it should be getting from the sensor and try to allow the engine to run.
If the engine does run, it will be rough and very little power.
The sensor measures air flow into the intake which the computer uses to regulate the fuel mixture.

Posted on Jan 12, 2013

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Posted on Jan 02, 2017

c17hydro
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SOURCE: MASS AIR FLOW SENSOR REPLACEMENT & DIAGRAMS

Very easy for the Mass Air Flow Sensor....it is in the duct between the throttle body and the air filter box. Just unclamp the tube and remove the old and replace with the new.

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On your pack....I need the engine size.


Posted on Mar 26, 2009

bnachos
  • 38 Answers

SOURCE: Bmw E46 318i touring. fail code 171

171 check, fuel supply system short circuit to b+

Posted on Jul 11, 2009

  • 247 Answers

SOURCE: maf sensor

This engine does not use a Mass Air Flow sensor or meter.

Posted on Jan 18, 2010

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emissionwiz
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SOURCE: I have a 1991 Buick Park Avenue. Runs rough in

Here are the common cause of surges, cold stalls, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours.
To correct this problem I want you to get a can of intake cleaner (ABOUT $5.00) from any local auto parts store like NAPA or Carquest, do not use carburetor spray, intake cleaner only or u will damage the Teflon coating inside the throttle valve and air bypass valve, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

Posted on May 25, 2010

Testimonial: "Thank you, I'm sure if your advice it was I'm looking for. But at least if this works, it will save me a lot money from having to replace expensive sensors."

  • 1 Answer

SOURCE: '97 Nissan pickup truck mass airflow sensor malfunction?

mine did the same thing except i bought one from python and it worked fine for 3 days but the same problem came back

Posted on Jun 13, 2010

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Symptoms of faulty air flow sensor


  • How to Detect and Clean a Faulty Mass Airflow Sensor ... www.carsdirect.com > Car Repair > Engine Repair 2012-02-24 · Symptoms of a Faulty Mass Air Flow Sensor ... Here are some of the most common symptoms of a faulty mass airflow sensor: ... CARSDIRECT IS AN ...
  • Mass Airflow Sensor: An Easy Fix for Big Problems from a ... www.airtexproducts.com/news-blog-mass-airflow-sensor-an-easy-fix... news,blog,mass,airflow,sensor,an,easy,fix,for,big,problems,from,a,little,instrument. ... Mass Airflow Sensor: ... What Are the Symptoms of a Faulty Mass Air Flow Sensor?
  • Signs & Symptoms of a Faulty Mass Air Flow Sensor www.geeksofcars.com/list_5794328_signs-mass-air-flow-sensor.html Signs & Symptoms of a Faulty Mass Air Flow Sensor. The Mass Air Flow Sensor is a device used on many fuel injected automobile engines to measure the density of air ...
  • See Bad Mass Airflow Sensor Symptoms on YouFixCars.com www.youfixcars.com/mass-airflow-sensor.html Video embedded · Mass airflow sensor problems can turn on the check engine light. They can also cause a variety of other symptoms before the ... How to clean mass air flow sensor ...
  • How to ' Tell If You Really Need a Mass Air Flow Sensor ... www.youtube.com/watch?v=aDlHCjgYf8s
    • BY AUTO REPAIR QUESTIONS ANSWERED BY WESLEY HARRISON
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    2011-08-22 · Video embedded · ... How To Clean a Mass Air Flow Meter and Tell if you really need ... Mass Air Flow Sensor ' Auto Repair ' Wesley Harrison ... Sensor Symptoms ...

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    Jul 09, 2016 | Cars & Trucks

    1 Answer

    I have a 98 Nissan Frontier. It wasn't running right so I unplugged the maf sensor and it ran better. I bought a new one from eBay. Replaced it and now it's running worse than before


      What Are the Symptoms of a Faulty Mass Air Flow Sensor?
      • The engine stalls soon after starting.
      • The engine drags or hesitates when idle or under load.
      • The engine hesitates and jerks during acceleration.
      • The engine hiccups.
      • The engine displays unusually lean or rich idling.

      Mass Airflow Sensor: An Easy Fix for Big Problems from a ...

      www.airtexproducts.com/news-blog-mass-airflow-sensor-an-easy-fix-for-bi...

    Sep 24, 2015 | Nissan Cars & Trucks

    1 Answer

    I rmv plug & coil on #6 cylinder in 08 DTS. When put bk correctly w no damage motor hd vibe, lack of pwr trans wldnt shift smoothly Code = misfire #5 cyl. Put new plug & coil in #6 still bad Help!


    Sounds like you have an air measurement issue either a vacuum leak or a out of calibration Mass airflow sensor try disconnecting the electrical connector at the mass airflow sensor with the key off then run the vehicle with the sensor unplugged if you symptoms improve your mass airflow sens is bad if no change get a vacuum gauge on it you should have at least 19" of vacuum at idle if you dont or the needle is bouncing around you have a vacuum leak or bad intake valve also test compression on a known good cylinder like num 1 and num 5

    Jun 11, 2015 | Cars & Trucks

    1 Answer

    96 chevy 2500 hd 5.7 v8.Replaced 3 bad 02 sensors and mass airflow sensor...when get to 3000 rpm it loses power... Especially when in passing gear...took to mechanic and said was wrong or bad mass...


    Remember, they don't hire rocket scientists at Auto Zone, ask your local dealership for the right part and then purchase the part at another auto store.

    Jul 02, 2013 | Cars & Trucks

    2 Answers

    Code p0100


    A code P0100 may mean that one or more of the following has happened:
    The MAF may be disconnected, or a wiring connection may be bad. The MAF sensor may be faulty
    Possible Solutions: Verify that the Mass Air Flow Sensor wiring is connected properly and that there are no broken / frayed wires. Unplug and reconnect the MAF wiring harness Check the voltage of the MAF sensor (refer to a repair manual for vehicle specific information) Replace the MAF sensor.

    May 19, 2013 | 2003 Kia Sorento

    1 Answer

    What happens when u unplug mass airflow sensor in 2000 ford mustang gt 4.6


    Car will lose power and not run proper and service light will stay on.

    Feb 20, 2013 | 2000 Ford Mustang

    1 Answer

    My 1991 240DL volvo has a hard start, and while idling, goes up and down, then eventually stalls out. The air flow sensor/air mass meter? was unhooked, and the car idled smoothly. Is it true that the car...


    When you unplug the mass airflow sensor, the car goes into "limp home" mode in which it runs full rich. Generally speaking, if a car runs better with the mass airflow sensor unplugged than with it plugged in, the mass airflow sensor has failed.
    However, the drifting idle tends to make me want to look for vacuum leaks and check the rear temperature sensor on the driver side of the head. I suspect that running over-rich is compensating for the vacuum leak so the car keeps running.
    If you have a propane torch or a can of diesel starting ether, spray it around the intake manifold while the car is idling and see if the engine speeds up. If so, then you have found a vacuum leak.
    If it were mine, I would buy a new intake manifold gasket and replace it as a routine maintenance item. It is not expensive or difficult to replace except that if you are like me, you WILL drop at least one nut, and there are several great hiding places on that side of the engine where the nuts go to hide when you drop them. You will need a magnet to recover them. You don't need to pull the manifold clear off, you just have to pull it clear of the bolts so you can slip in a new gasket. You can leave the throttle cables and most of the other connections hooked up
    If you know how to use an ohm meter, you might consider getting a manual for this car and looking up the appropriate resistance/temperature values and checking that rear temperature sensor.
    While you are replacing that intake manifold gasket, check all the vacuum ports to make sure they are clear, and check all the vacuum hoses to make sure they are intact. Also check the tubes between the mass airflow sensor and the throttle body for cracks. While you have those air tubes off, clean the throttle body and the idle air control valve with some carb cleaner. Spray a little carb cleaner through the mass airflow sensor as well. Actually, there is a special spray for cleaning mass airflow sensors that is more gentle, but I have used carb cleaner on them many times with no apparent ill effects.
    If it turns out that the mass airflow sensor has failed, that will run some $$, but having a fresh intake manifold gasket and clean throttle body and no vacuum leaks will be worth your time and money and make the car run better when you are done.

    Jun 07, 2011 | Volvo 240 Cars & Trucks

    1 Answer

    I unplugged the Mass Airflow Sensor and my truck runs better. I'm told by parts suppliers there is no Mass Airflow Sensor. What part did I unplug and will it damage the engine to run without it?


    Most likely if there is no mass air sensor you actually unplugged the inlet air temperature sensor IAT. This is a little bead like thermistor that sits in the ducted air stream to measure incoming air temperature. Without an air mass sensor your engine will have instead a manifold absolute (air) pressure MAP sensor. This measures the absolute air pressure (the difference between the atmospheric air pressure outside and the drop in pressure inside) in the inlet manifold. The drop in pressure in conjunction with air temperature allows the engine control unit to calculate the amount of air in the engine to which it adds the correct amount of fuel per each injection cycle. The loss of the IAT signal is not critical as the ECU will assume a default value. However when extreme low temperatures are encountered the absence of the IAT may be become noticeable as the charge of air entering the engine will be denser and as a consequence the fuel mix will be much leaner; maybe to lean to start up.

    Sep 08, 2010 | 1998 Chevrolet S-10 Pickup

    1 Answer

    01 nissan pathfinder


    The mass airflow can get dirty and you will get trouble codes for everything under the hood except for the mass airflow. Try unplugging your mass airflow and driving the vehicle, if your problem goes away you need to clean the sensor. Buy some mass airflow cleaner though because other cleaners can damage the coating on the sensor.

    Feb 26, 2009 | 1995 Nissan Pathfinder

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