This is a discussion on Symptoms of bad maf sensor? Forum Rules. Remember Me? What's New? Results 1 to 15 of Symptoms of bad maf sensor?Dj ms blogspot
Add Thread to del. Thread Tools Show Printable Version. Share Share this post on Digg Del. Any mods to the car? When was the last time you cleaned your maf sensor? What code number is it? Never cleaned the maf Clean the maf a bottle of the stuff is 5 bucks at a auto store if that doesn't fix it continue to the next thing.
Originally Posted by LS1junkie Are you sure you just don't have a bad gas tank cap. I know if its loose or not sealing correctly it will throw that code.
A bad or dirty MAF usually causes motor surging and Idle problems on my car. Thanks for any help. Help with code p Suggestion: If you are particularly irritated by another member's posting habits and are constantly fighting the urge to flame them, you can click on that person's profile, and select "Add to ignore list.
P is the the code that needs to be addressed first. This is an indication you MAF has failed. Is it a factory MAF or aftermarket?
Its factory maf. You can usually do a quick check of the MAF by tapping on the flat portion of the sensor body with a screwdriver while the car is running. If the engine stumbles or stalls, the sensor is faulty. You can also check voltage with the ignition key turned to the on position, car not running. There should be between volts. Should read 12 volts. This is from the Haynes manual for pre V8's.
Trouble codes p p p Refback This thread. How to test ls1 maf - 1Q5A Refback This thread.All you need to diagnose and troubleshoot the MAF sensor is a digital multimeter capable of reading Hertz Hz frequency. Now, in case this is not the article you're looking for, there are also 3 other GM MAF sensor test articles:. The most obvious one is that the check engine light CEL will be on on your instrument cluster and driving you nuts. Here are a couple of others:. You'll need a digital multimeter that can read Hertz Hz Frequecy don't have a digital multimeter that can read Hertz frequency?
As mentioned earlier, you don't need an automotive scan tool to test the MAF sensor. Having said that To be able to diagnose and troubleshoot this GM MAF sensor, you'll need to know what each one of those wires does and how to test the signal that is carried by it.
Below are the circuit descriptions that you'll be using thru' out the article. I did not include the color of the wires because as long as you're able to identify them by the number in the photo, you'll be OK. Also, the color of the wires in the photos may not be the color of the wires of the MAF on your specific vehicle and again this is no cause for concern. All Tutorials: 4. This material may not be reproduced without the author's consent. Page 1 Page 2 Page 3. Applies To:.
5 Symptoms of a Bad Mass Air Flow Sensor (MAF Sensor)
Buick Vehicles: Rainier 5. Chevrolet Vehicles: Suburban, Tahoe 4. GMC Vehicles: Envoy 5. Hummer Vehicles: H2 6. Do NOT follow this link or you will be banned from the site! Hate Spam.Dan Ferrell writes about do-it-yourself car maintenance and repair.
He has certifications in automation and control technology. A bad manifold absolute pressure MAP sensor can upset fuel delivery and ignition timing. Depending on your vehicle model, your engine might experience one or more of these performance problems:. However, these symptoms are not exclusively symptoms of a failed MAP sensor. Sometimes, a bad sensor may trigger the check engine light CEL.Suriya wife
If a trouble code has been stored on the computer memory indicating a problem with the MAP sensor, it's a good idea to actually test the sensorm to confirm that the problem lies with the sensor and not some other related component. Troubleshooting a MAP sensor is a straightforward procedure using a digital multimeter DMM and a hand-held vacuum pump. If you don't have the pump, your local auto parts store may lend you one.
In the following sections, you'll find some important information about the sensor, what to pay attention to during your inspection, and a simple MAP-sensor test procedure. Keep in mind that these tests apply to gasoline, four-cycle internal combustion engines without a turbo or supercharger. If necessary, consult the vehicle repair manual for your specific model. Basically, a MAP sensor reads the amount of air pressure in relation to vacuum inside the intake manifold, either directly or using a vacuum hose.
Then, it translates this pressure into a voltage signal that the sensor feeds to the power control module PCMyour car's computer. Instead of a MAP sensor, most modern vehicles use a mass air flow MAF sensor that the computer uses to calculate air flow along with engine rpm. Some vehicles come equipped with both a MAP and MAF sensor, usually forced induction systems like turbocharged and supercharged models. If you need information regarding your vehicle, consult the repair manual for your particular make and model.
You can buy an inexpensive Haynes manual from Amazon.
These manuals come with procedures for many maintenance, troubleshooting and replacement component projects. So the manual practically pays for itself after the first maintenance or repair project. Use the repair manual for your particular vehicle make and model for diagnostic value specifications.
You can find a more detailed description of these codes in your vehicle repair manual or by searching on-line. Carefully read the description of the code you've found and what the potential fault resulted from this code.
7 Symptoms of a Broken MAP Sensor
Remember that even though the code points to the potential problem, the particular circuit or component involved may not be at fault. Instead, a related component may have triggered the code. For example, in many applications a leaking vacuum hose or a bad throttle position sensor TPS may cause a trouble code that points to a faulty MAP sensor.This is a discussion on MAF going bad? But im no expert. Lately my car has been smelling like Forum Rules.
What's New? Page 1 of 5 1 2 3 4 5 Last Jump to page: Results 1 to 20 of MAF going bad? Add Thread to del. Thread Tools Show Printable Version. I think maybe my MAF might be going bad? Lately my car has been smelling like gas fumes pretty badly and i couldnt figure out what it is. So this morning i had the bright idea to unplug the MAF and the sensor that goes into the lid, then i went for a few test drives.
The car doesnt smell nearly as bad as it did with it plugged in.Shopping role play dialogue
So u plugged in the sensor for the lid and ran it a few more times. Still doesnt smell too bad so maybe im thinking my MAF could be throwing off the PCM to dump fuel when there is no need to dump fuel?Salfety mod loader
Any thoughts? Also is it bad to drive you car around with the MAF unplugged? Share Share this post on Digg Del.
MAF going bad?
Any codes? No codes before unplugging and no codes after unplugging. When you unplug the MAF it sends the system into speed density mode. Airflow is calculated primarily using the MAP sensor.The mass air flow MAF sensor is an important component which the engine control unit depends on.
When the flow of air enters the fuel injection system of the engine, the mass air flow sensor will analyze how much air is flowing in there. It will then relay this information back to the engine control unit. From there, the engine control unit will be able to control how much fuel gets injected into the engine. As you may know, there needs to be just the right amount of air and fuel mixed together in the internal combustion chamber of an engine. Therefore, if the mass airflow sensor goes bad then it will ultimately jeopardize the performance of the engine.
A bad MAF sensor is fairly easy to detect from the very beginning. You just need to be able to recognize the symptoms as they occur so that you will know to associate them with a possibly faulty mass air flow sensor.
Sometimes these symptoms may be due to other reasons, but you should still have your mass air flow sensor inspected if you experience at least a few of these symptoms that are listed below.
When you have a lean idling problem with your engine, this is the result of too much air and not enough gasoline getting mixed together in the internal combustion chamber. Meanwhile, there is very little gasoline being burnt in the process. This will ultimately hinder the performance of the engine.
When you put your key into the ignition and twist it, you may find the engine is difficult to turn over or start altogether. This is understandable with a bad mass air flow sensor because it will cause the internal combustion chamber to have an inadequate mixture of air and gasoline. If the engine is going to successfully turn over, then you need to correct this problem so that the spark plugs can ignite the proper mixture.
Whenever you increase the load of your vehicle, it will put more demand on the engine to generate enough power to sustain this weight. This means that more gasoline and air will be required in the internal combustion chamber. But if you have a bad mass air flow sensor, then you will likely not get enough gasoline to accommodate this load. This will cause the engine to go idle or drag a lot. When you start up your vehicle, and the engine turns on, you may think everything is fine.
This symptom may occur if your mass air flow sensor is just starting to go bad. It may send accurate airflow information to the engine control unit at first, but then it will stop doing so shortly after.
When you step on the gas pedal to accelerate the vehicle, you may experience hesitation as you are moving forward. This is the result of the engine not receiving a steady flow of gasoline to accommodate your acceleration demands.
So, the acceleration will begin hesitating because the engine is lacking this gasoline. You should immediately get your vehicle checked by a mechanic so that you can replace your sensor and prevent any accidents from happening.
I have a dodge caravan 2. Your gas cap is not tightened all the way or needs to be replaced because it no longer seals all the way. Easy fix.An engine with a bad MAF sensor may be hard to start or stall after starting. It may hesitate under load, surge, idle rough or run excessively rich or lean. The engine may. If you suspect a MAF sensor problem, scan for any fault codes. A MAF problem should but does not always set a fault code.
Codes that may indicate a problem with. MAF sensors can be tested either on or off the vehicle in a variety of ways. If testing on the vehicle, unplug the wiring harness connector from the sensor and connect the tester and tachometer.
Start the engine and watch the readings. They should change as the throttle is opened and closed. No change would indicate a bad sensor.Schema electrica automatizare generator
The same hookup can be used to test the MAF sensor off the. When you blow through the sensor, the readings should change if the sensor is detecting the change in air flow.
With Bosch hot-wire MAF sensors, the output voltage can be read directly with a digital. The voltage reading should be around 2.How to - Tell If You Really Need a Mass Air Flow Sensor - Auto Repair - Wesley Harrison - Clean-MAF
Check the orange and black feed wire for 12 volts, and the black wire for a good ground. Power to the MAF sensor is provided through a pair of relays one for power, one for the burn-off cleaning cycleso check the relays too, if the MAF sensor appears to be dead or sluggish.
If the sensor works but is slow to respond to changes in air flow, the problem may be a contaminated sensing element caused by a failure in the self-cleaning circuit or relay. With the engine idling, the sensor should output a steady 2. Tap lightly on the sensor and note the meter reading. A good sensor should show no change. You can also check for heat-related problems by heating the sensor with a hair dryer and repeating the test. This same test can also be done using a meter that reads frequency.
The reading should go from 4 to 8 gps at idle up to to gps at wide-open throttle. Like throttle position sensors, there should be smooth linear transition in sensor output as engine speed and load change. The waveform should be square and show a gradual increase in frequency as engine speed and load increase. Any skips. Yet another way to check the MAF sensor is to see what effect it has on injector timing.
Using an oscilloscope or multimeter that reads milliseconds, connect the test probe to any injector ground terminal one injector terminal is the supply voltage and the other is the ground circuit to the computer that controls injector timing.
Injector timing varies depending on the application, but if the mass air flow sensor is not producing a signal, injector timing will be about four times longer than normal possibly making the fuel mixture too rich to start. You can also use millisecond readings to confirm fuel enrichment when the throttle is opened during acceleration, fuel leaning during light load cruising and injector shut-down during deceleration.
Under light load cruise, for example, you should see about 2. I agree with other answer that there are several symptoms such as poor idle, stalls, or no starts. If the sensor is bad or contaminated bad enough, there is usually a check engine light illuminated.An IAT sensor is an important component that is needed while starting up a vehicle's engine. A faulty sensor can decrease the life of the engine and reduce the efficiency of fuel consumption. Take a look at the symptoms and understand why such a problem occurs.
IAT sensors are known by various names depending on the manufacturer. An intake air temperature sensor is an essential component of an engine, which ensures that the vehicle starts smoothly, and that the fuel-to-air ratio is maintained at appropriate levels, for effective combustion of the fuel when the engine is cold. In some vehicles, it is used to delay the release of the exhaust gas recirculation valve, and decreases the time taken for the engine to warm up. Would you like to write for us?
Well, we're looking for good writers who want to spread the word. Get in touch with us and we'll talk The IAT sensor can be damaged by backfiring of the engine. The sensor can also show faulty readings due to accumulation of oil and carbon, wear and tear over time, and a poor connection after servicing the air filtering unit. We shall now check out the various warning signs that one should look out for, and tests to identify a malfunctioning air temperature sensor.
The above symptoms of a bad intake air temperature IAT sensor are not a foolproof way of determining the problem, because they are common for a few other malfunctioning components as well, such as mass air flow sensor, oxygen sensors, coolant temperature sensor, etc.
So, to make sure that the IAT sensor is the actual one to blame, a few tests need to be carried out. Testing for a faulty IAT sensor is not very difficult, and requires only a scanning tool, a multimeter, and a wire piercing probe.
This process is inexpensive, and is always a good idea before going in for a replacement. To use the scan tool, you need to perform the following steps. The only thing remaining is to check for a circuit malfunction in the IAT sensor. To do this, there are a few important things to keep in mind: Never touch the MAF sensor connector with the leads of the multimeter from the front.
You can either use specially designed back probes or wire piercing probes. Now, to check the circuits, perform the following procedure:. To fix a faulty intake air temperature sensor, remove all carbon and oil accumulation.
If this does not fix the problem, replacing the unit is the best option. Necessary cookies are absolutely essential for the website to function properly. This category only includes cookies that ensures basic functionalities and security features of the website. These cookies do not store any personal information. Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies.
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