Today we will give you complete information about the symptoms of bad mass air flow sensor because it is necessary to know the symptoms of the sensor to know the problem.
Mass air flow sensor is very important for the car engine and it is used to measure the amount of air going inside the engine.
But when it is bad then we see different symptoms from which we can know whether the mass air flow sensor is correct or bad.
If you want to know about its symptoms, then first you need to know how the mass air flow sensor works, if you know the working of the sensor, then you will know the symptoms yourself, but today we will give you the information about sign of bad air flow sensor
working of mass air flow sensor diesel and petrol engine
The air filter in the engine has a mass air flow sensor and its main function is to check the air going into the engine and prepare a signal and send it to the ecm.
After starting the car, the amount of air and fuel that goes into the engine together is already fixed. There is a ratio of air and fuel going into the engine, it is 14 ratio 1.
This means that if 14 grains of air go inside the engine, then 1 grain of fuel goes, only then the engine will be able to start properly and will work properly.
For the supply of fuel in the cylinder, it is necessary for the ecm to know the amount of air going into the engine, for that the ecm receives information from 2 sensors, the first mass air flow sensor and the second oxygen sensor.
Suppose the pipe of the air filter bursts and through that pipe a large amount of air is going into the engine, but the mass air flow sensor is giving information of 14 grains of air to the ecm.
According to the information received by the ecm, it will send 1 grain of fuel to the engine, but due to excess air, the fuel will not burn and it comes out in the form of smoke, there is an oxygen sensor in the exhaust pipe.
When that smoke goes to the oxygen sensor, then the oxygen sensor sends a signal to the ecm and tells that the engine is getting more air, the ecm comes to know that the mass air flow sensor is giving wrong information.
At that time the ecm turns on the mass air flow sensor code and prompts us to check the car, if the pipe is fine, the ecm continues to supply fuel according to the information from the mass air flow sensor.
symptoms of bad mass air flow sensor
You must have noticed above that if the air filter pipe bursts, then more air enters the engine and due to which the fuel and air in the engine does not burn properly and you will also see the symptoms of mass air flow sensor related to this.
(1) . check engine light is on
Whenever there is a problem with the mass air flow sensor in your car, like we told you above that the pipe bursts, then the check engine warning light turns on in the dashboard.
This is a yellow color light that indicates a problem, so if the check engine light turns on, you should turn off the car and get the car scanned.
(2) . mileage is very bad
The mass air flow sensor installed in the air filter is one of the main reasons for the low mileage. When the engine starts, both fuel and air go into the engine, but when the mass air flow sensor is bad.
So at that time fuel goes right in the engine but more air goes in the engine, at that time the ecm supplies fuel according to the supply of air, which reduces the mileage.
(3) . misfiring problem
After having a problem with the mass air flow sensor, you may see the problem of misfiring in your car because misfiring occurs due to improper mixture of fuel and air.
When 1 grain of fuel goes into the cylinder and too much air goes into the engine, misfiring occurs due to not burning the fuel properly, the engine starts shaking.
(4) . pickup down
The car may feel the problem of pickup down whenever there is a problem with the mass air flow sensor then the pickup of the car will be reduced the car will pickup after a long time
Because the car needs fuel and air according to the quantity for proper pickup, but when the mass air flow sensor is bad, then the amount of air changes, which spoils the mixture of fuel and air and the pickup is less.
(5) . black smoke problem
The most common symptom that appears when the mass air flow sensor malfunctions is black smoke coming out of the exhaust because it occurs when the fuel and air in the cylinder do not burn properly.
When 1 grain of fuel goes into the engine, but the air has to go in a very large amount, then the fuel does not burn at that time and it comes out in the form of smoke from the exhaust.
(6) . hard starting
After the problem of mass air flow sensor, there is a problem of hard starting in the car, as soon as we apply self, then the car starts after a long time, cranking too much.
The reason for this is also that the fuel does not burn in the cylinder, when the fuel and air in the cylinder do not burn in the right amount, then there is a problem of hard starting.
(7) . morning starting problem
You must have seen that the car does not start in the morning, after a lot of cranking, the car starts because at that time the amount of fuel and air in the engine is not correct.
Due to bad mass air flow sensor its signal breaks from ecm or it sends wrong signal to ecm which causes morning starting problem
(8) . rough idling
After a problem with the air mass sensor, you may feel rough idling in your car, you may get to see more or less RPM in the dashboard.
Whenever you drive your car, you will feel a jolt, feel misfiring, rpm will be low and high, engine shakes lightly on idling.
You must have come to know about all the symptoms of bad mass air flow sensor above, but have you noticed one thing that all the symptoms are related to the cylinder, so first see the working of the sensor, you will see the symptoms yourself.
how to fix it mass air flow sensor problem
If the mass air flow sensor of your car is damaged or the code connected to it is turned on, then do not worry, we will tell you how you can check this problem.
(1) . car scan and clear code
(2) . check sensor wire and connector
(3) . clean mass air flow sensor
(4) . check air leak and air filter pipe
(5) . check wiring signal
(6) . change mass air flow sensor
Hope you have got complete information about the symptoms of bad mass air flow sensor and now you will not have any problem related to it, if you have any problem, then comment below, we will help you but do not change the part suddenly.
Know the answers to some questions
Q . How to keep the mass air flow sensor correct?
ans. If you want to keep the mass air flow sensor correct, then you should get the service done on time and clean the mass air flow sensor.
Q . What is the most common problem with mass air flow sensor?
ans. Dust accumulates in the mass air flow sensor or there is a problem with its wire and connector.
Q . Are the symptoms of mass air flow sensor same in diesel and petrol cars?
ans. In petrol and diesel cars, the same symptoms appear after the mass air flow sensor is damaged.
Q . When does mass air flow sensor need to be cleaned?
ans. When the mileage and pickup of the car decreases, then at that time you must clean the mass air flow sensor.