Trying to locate the Mass Air Flow sensor , and the Idle Air Control valve 2002 Ford Fiesta
Im trying to locate the Mass air filter sensor and idle control valve on my 2002 1.4L Ford Fiesta zetec for cleaning. I have located and cleaned the throttle body, could someone point me in the right direction to find Maf sensor and Idle control valve. Thank you đź‘Ť
My car has 110000 miles.
My car has a manual transmission.
Experienced mechanics share their insights in answering this question :
Hello – Mass Air Flow meter is a short, cylindrical section of the air intake, just inside of the air filter housing, and just before a large cuved plastic-molded piece of the air intake. It has a flat electrical connector plugged into it. The idle air control valve is just past the throttle body in the intake, on the engine side of the throttle body. It is a small cylindrical tube about 1 1/2: in diameter and 4 inches long, bolted to the intake manifold with an electrical connector. For the effects of dirty sensors – click here.
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MAF sensors can become damaged, but more often they just get too dirty to do their job well. In this case, they can be cleaned but if it is a mechanical or electrical failure, they must be replaced.
Most agree that the MAF should be placed where the smoothest and most consistent air flow is. Typically this must be before the turbo inlet or after the intercooler near the throttle body. On an aftermarket “cold air” intake it is best to allow around 12 inches of straight, unobstructed tube to place the MAF in.
Mass Air Flow Sensor Location Theory: Explained!
Chevrolet Performance recommends the MAF be at least 10″ from the throttle body. This is to move the sensor far enough away from intake pulses which could disrupt the reading. Being at least 10″ from the throttle body will give the MAF more consistent airflow to read.
With the engine at idle, the MAF`s PID value should read anywhere from 2 to 7 grams/second (g/s) at idle and rise to between 15 to 25 g/s at 2500 rpm, depending on engine size. Most manufacturers provide specifications for air flow at idle; some will provide specifications at several engine speeds.
Firstly, unplugging the MAF sensor will cause the engine control module (ECM) to detect a fault in the MAF circuit and trigger a warning light on the dashboard. This warning light may also affect other systems such as the transmission and emissions control.
Error code P0101 indicates that there is an issue with your mass airflow sensor (MAF).
Symptoms of a Faulty Mass Air Flow Sensor
The engine is very hard to start or turn over. The engine stalls shortly after starting. The engine hesitates or drags while under load or idle. Hesitation and jerking during acceleration.
Another common occurrence after the replacement of a faulty MAF sensor is the vehicle not idling correctly or a flat spot on acceleration, leading to the sensor being incorrectly blamed again. It is not uncommon for an engine to run a little rough and not idle properly initially after replacement.
Yes, disconnecting the battery for around 10 to 15 minutes is an important step to take after replacing the MAF sensor to ensure that the sensor resets. This way the computer will forget the parameters it had previously learned and adjust to the new settings.
More commonly a mass airflow (MAF) sensor is used in place of a MAP sensor, however, turbocharged engines will typically use both a MAP and a MAF sensor. The MAP sensor also provides a vital role in helping the ECM determine when the ignition should occur under varying engine load conditions.
An anemometer, a test instrument that measures air velocity is used to determine the average airspeed in the duct. Then the average feet per minute is multiplied by the area of the duct in square feet to determine the airflow moving through the duct.
What`s the difference between a MAP and a MAF sensor? A MAF sensor measures how much air is aspired by the engine. A MAP sensor, on the other hand, provides a measurement of the air pressure in the intake manifold. The ECU uses this information to calculate the amount of air that needs to be aspired.
Installed in the intake pipe between the air filter housing and the intake manifold, most MAF sensors work on the hot wire principle. Put simply, a MAF has two sensing wires. One is heated by an electrical current, the other is not. As air flows across the heated wire, it cools down.
It relies on two sensors: one electrically-heated sensing wire and one temperature sensing wire. The engine throttle opens when you press on the gas, allowing more air to flow around the hot wire.
MAF sensors are located between the air filter and the throttle body and are responsible for measuring the amount of air entering the engine. Most vehicles have a hot wire MAF sensor. It has one heated wire and one ambient temperature wire.
Relevant Questions and Answers :
the most relevant questions and answers related to your specific issue
Trying to locate the Mass Air Flow sensor , and the Idle Air Control valve 2002 Ford Fiesta
ANSWER : Hello – Mass Air Flow meter is a short, cylindrical section of the air intake, just inside of the air filter housing, and just before a large cuved plastic-molded piece of the air intake. It has a flat electrical connector plugged into it. The idle air control valve is just past the throttle body in the intake, on the engine side of the throttle body. It is a small cylindrical tube about 1 1/2: in diameter and 4 inches long, bolted to the intake manifold with an electrical connector. For the effects of dirty sensors – click here.
High idling, jumping while idling, idle air control valve code
ANSWER : Hi there. This can be caused by the issues that you mentioned or a number of other things. You need to make sure all of the connectors are making good contact. I would then need to know what codes are in the computer to know if this is a circuit issue or not. Most of the time, it is not the circuit but instead a vacuum leak.
If there is a vacuum leak, then the vehicle will act like this and the computer cannot control the idle. Most of the time it is a bad hose or an EGR valve that is stuck open. That is the most common cause for this. I typically remove the EGR to check it to feel the diaphragm on the bottom of it to see if it is moving correctly. If you need to have this repaired, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose and repair your car’s idling issue.
My code reader says I have a bad mass air flow sensor ans crank shat sensor test drive ran better shut off & engine Lt. Same code
ANSWER : Hi there. The problem you are describing, sounds like you may have a poor connection in the connector at the mass airflow sensor. Although, sometimes aftermarket parts do not perform as well as factory (OEM) parts. Check for corrosion and/or wide spacing in the terminal ends. Compare the terminal ends in the connector using a flashlight to see better. The terminals can be tightened. If you are not comfortable with doing that, a replacement pigtail (connector) is available. You vehicle may require further diagnosis performed with a scanner that provides parameters that can be viewed as the fault occurs. If that is the case, I recommend having your vehicle’s electrical circuits inspected in order to pinpoint the underlying fault.
Rough idle after replacing Mass Air Flow Sensor – trouble codes P0171 and P0102
ANSWER : The P0171 refers to a possible lack of fuel pressure, a leak in the intake air system, or a possible vacuum leak. The P0102 also leans towards a leak in the intake air system. It is possible that there is a problem with a BARO (barometric pressure) sensor that is reading faulty. Its purpose is to measure atmospheric pressure, the amount of air entering the engine, and supply the ECM with a calculated reading that allows the engine to make corrections accordingly.
If the BARO sensors readings are off, the supplied amount of fuel will be incorrect, and can therefore cause running issues. I would first check all of the intake plumbing to be sure it is all seated and tight, and then test the BARO sensor for correct function.
I recommend having a certified mechanic, such as one from YourMechanic, come to your location to determine why your car is idling rough and if the barometric sensor needs replacing.
The car keeps cutting off, i brought idle air contol, mass air flow, and map sensor. What could be wrong
ANSWER : There are many faults that can cause a vehicle to stall. A faulty engine speed sensor or weak fuel pump just to start. If the Check Engine Light is on, the vehicle can be scanned for fault codes. The fault codes will not tell the mechanic what to fix, but will be a good place to start when looking for problem components. I recommend getting a second opinion on the issue. The stalling problem should be thoroughly diagnosed by an experienced mechanic who can check several parameters in order to track down the bug before moving forward with repairs.
P0300 codes while idling
ANSWER : Hello. If unplugging the MAF sensor causes the engine to run better then there is a secondary air leak into the engine. This means that there is a vacuum leak from someplace. Most of the time on this engine it is from the intake manifold. It may also be a rich condition that can be from the fuel injection unit.
I usually check this by installing a scan tool to see what the fuel trim readings are. This will tell me if it is getting too much air or fuel and where to start. I have seen more intake manifold gasket failures on this engine than anything else. If you are going to have this repaired, consider YourMechanic, as a certified mechanic can come to you home or office to diagnose your Check Engine Light and repair it accordingly.
check engine light read mass air flow sensor
ANSWER : First of all, cleaning a mass air sensor may not have fixed the sensor and O2 sensors cannot be cleaned. The O2 sensors for bank 1 and bank 2 means that the left and right side of the engine. You have one sensor just below the manifolds on each side of the motor and then sensors after the catalyst. There may be more than three or four sensors on the truck depending on if you have dual exhaust catalyst or not. Each sensor will have a specific code that relates to it in the computer when a failure happens. Your O2 sensors may only be telling you that you are running too lean on both banks of the engine and may have a mass air sensor or fuel injection fuel flow problem that is the cause. Have a mechanic properly diagnose the Check Engine Light before replacing or cleaning the sensors to try and fix the issue. A qualified mechanic will have to do the pinpoint tests to isolate the cause. This will save you money in the long run by not replacing parts that are not needed.
Is the idle air control and mass air flow sensor are related
ANSWER : Hello. The mass airflow sensor and the idle air control both service as inputs for the computer to make critical calculations. If the leak you are referring to is a vacuum leak, then yes, all of these components can play a factor. When air enters the system and it does not pass by the mass airflow sensor, this is considered a vacuum leak. If damaged or faulty, the idle air control valve can be a source for the vacuum leak. This may be the reason several sensors are effected. To fully diagnose the issue, you will want to find the source of the leak and start by making that repair. If the mass airflow sensor has failed, you will need to replace it. More inspection will need to be done.
