Chevy trax mass air flow sensor cleaning

Cleaning a dirty mass air flow MAF sensor saves you money. Well, savings at the gas pump for one since you'll get better gas mileage. Your carbon footprint will be less, since you will be polluting less, not to mention that you'll be getting your engine's worth of power. Since a dirty MAF sensor makes the engine pollute more and produce less power. Alright, enough of the b.

Now, inca case you're just coming into this page from a search engine like Google, Bing, etc. We need to remove the four torx head type bolts to disassemble it. You'll need a torx-head bit-socket and a ratchet, or a torx-head screw-driver to remove them the torx size is T27 and you can find this tool in just about any auto parts store.

As you can see in the photo, we need only to remove the part with the metal mesh to expose the front of the hot-wires that are exposed to the incoming air flow. But if all three pieces come apart when you remove the four torx head bolts, well that's OK too. Don't worry about mixing up the three parts, since each piece fits into the other in a certain specific way.

It's impossible to re-assemble MAF sensor wrong. But it may help you to re-assemble it faster if you make some identifying marks on each part of the MAF sensor. Just spraying them with the appropriate cleaning spray is enough to clean them.

I can tell you from personal experience that physically touching them to clean them, even with something like a cotton swab, can break them.

Once you've sprayed them, and the fuzz has been removed, you're now ready to re-assemble the MAF sensor. Match up the marks you made on the individual MAF sensor's parts. Install the four torx-head bolts and tighten them to a proper torque. Re-install the MAF sensor to its location in the engine compartment. Once everything is tightened up, road test the car or truck to verify the MAF cleaning.

Now, if your car or truck's performance did NOT improve after the cleaning, then the contaminated dirty MAF sensor you just cleaned was NOT the cause of the issue you're trying to solve.

I recommend looking into testing the MAF sensor itself to see if it's bad. What specifically?To clean or replace your mass air flow sensor, you need to disconnect it from the air flow system of your engine. The mass air flow sensor is located behind your air filter housing toward the rear of your engine. It is a square-in-shape attachment that is bolted onto the air flow tube. The sensor is also connected to your car's electrical system. It is imperative that you know the correct way to disconnect a mass air flow sensor so that nothing else in the system gets damaged.

Park your car on a level surface. Turn off the engine. Open the hood and let the engine cool down. You want the engine cool to the touch before you begin to disconnect the mass air flow sensor. Trace the plastic air flow tube back from the air filter housing until you locate where the sensor is attached to it.

The mass air flow sensor will be bolted to the top of it. Follow the wiring harness coming from the sensor to where the sensor harness plugs into your car's electric system. Squeeze the tabs in on the sides of the connecting terminal, and pull the terminal apart to separate the two harnesses. Remove the four bolts holding the mass air flow sensor into place on the air flow tube with a socket wrench, then lift the sensor out of place.

You can now clean or replace your mass air flow sensor. This article was written by the It Still Runs team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information. To submit your questions or ideas, or to simply learn more about It Still Runs, contact us. Step 1 Park your car on a level surface. Step 2 Trace the plastic air flow tube back from the air filter housing until you locate where the sensor is attached to it.

Step 3 Follow the wiring harness coming from the sensor to where the sensor harness plugs into your car's electric system.

Tip Tuck the wiring harness that goes into your car's electrical system up under the air flow tube when you disconnect it; this way it will be easier to find the end when you go to re-install your sensor. Warning Do not touch the soldered wire connections on the mass air flow sensor as they can be easily damaged.

Once they are damaged, you will have to replace the entire unit. References FreeAutoMechanic. About the Author This article was written by the It Still Runs team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information. Photo Credits Ablestock.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.

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Start the engine and watch the readings. They should change as the throttle is opened and closed. No change would indicate a bad sensor. 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. 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.

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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.This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation.

Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. The P OBD-II code means that, on the first bank of the engine, the fuel system is running weak or a vacuum leak exists near this side of the engine.

A lean condition occurs when the engine either receives too little fuel or too much air. Assuming that no other trouble codes exist, a mechanic may diagnose the P code by checking the engine for vacuum leaks with a vacuum gauge. A vacuum leak will create a hissing sound usually only audible when the engine is turned off. The fuel pressure sensor and MAF sensor mass air flow will also be checked with a fuel pressure gauge.

The cause of this trouble code will likely be discovered during one of these two tests. If the cause of this issue is still not found after the mechanic has performed these two tests, the problem likely lies with a sensor. If all of these tests have been performed and no issues are found, the problem is likely the powertrain control module. A mistake that often occurs is not looking for any technical service bulletins for your specific car model that may be related to this issue.

Although not every trouble code will have a technical service bulletin associated with it, it is always wise to check. They can save you a world of time and effort. The P code is a serious issue. If a vehicle has this code stored in its powertrain control module, the engine of that vehicle simply will not run well. It is a good idea to have this code diagnosed and repaired as soon as possible to have your vehicle running smoothly. It is unwise to drive a vehicle with this trouble code stored for a long period of time.

If an engine runs improperly for a long period of time, further damage may result that could end up being much more costly to the owner of the vehicle. YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at With YourMechanic you can skip the auto shop altogether.

They send certified and screened mechanics straight to your door and enable you to save big on car repair and maintenance. Cost of diagnosing the P code. No more waiting rooms!Mass airflow sensor problems can cause a variety of symptoms from the annoying to the must repair. Also watch the video on how to clean MAF sensors without damaging the delicate part at the bottom.

Code P0171 - System Too Lean: Symptoms, causes, common problems, diagnostic

Here are some problems a malfunctioning senor can cause. Rough idle, engine hesitation, lack of power and poor fuel economy.

chevy trax mass air flow sensor cleaning

However, the big one is a random stalling condition. I should also mention the older the part is the more likely problems are. When I had a stalling complaint with no set codes I would do a light tap test at the connector area and see if the RPM changed.

If it does, it needs a new one. The mass airflow sensor can turn on the check engine light and set some strange codes. This depends on how bad the car is running. I have seen random misfire codes and o2 sensor faults set. Often you can narrow down diagnosis using the set trouble code. However, when the MAF sensor malfunctions some faults will actually be symptoms of the root cause.

chevy trax mass air flow sensor cleaning

Take a P for instance, which stands for low air volume or input signal to the computer. It can be a wiring issue, problems with the sensor itself or an actual air flow issue. We discuss this in detail below.

This is why you still need to start with the basics. Check for things that would be more common then a defective part. A vacuum leak is an excellent example.

This is where air gets pulled into the intake manifold without the computer knowing about it.

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In this scenario air bypasses the flow sensing element and you get a lean condition. This is a common condition on older, high mileage vehicles. It allows air to enter the engine without the computer knowing about it. Thus, symptoms and false trouble codes indicating a sensor failure are likely. This can display the same problems and symptoms as a defective part.

Any vehicle with over 20, miles might experience problems due to contamination buildup on the heated element of the MAF sensor. As a rule of thumb, the older the vehicle the more likely this problem is.

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Unfortunately, it can change the operation of the automobile for the worse. As an example, in Ford came out with a technical service bulletin as well as Mazda, that outlined the test procedure for a contaminated mass airflow sensor. Vehicle manufacturers eventually built in a self-cleaning mechanism into the part. It works by super heating the sensing element to burn off any contamination like a self cleaning oven. I have an important tip for you that I learned the hard way. You should never use carburetor cleaner on a mass airflow sensor.

It can ruin a good part. There is an example posted in the video to follow. The chemicals are just too harsh and can damage the plastic. This can cause more problems than the dirty sensor did. The CRC chemical company makes a specialized cleaner that removes any contaminants without damaging the plastic.

There may be other manufacturers that make this cleaner, but make sure they are plastic safe.

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The sensor pictured on the right, converts air flowing past a heat sensing element into an electrical signal.The vehicle has no drivability concerns and was hard to diagnosis. The TCM transmission control module is setting incorrect gear ration codes which means the transmission is slipping usually. Then of course P and P, lean both banks.

Fuel pressure was within specifications psi and the MAF was reading correctly, I thought! I can hook up the scope and perform a snap throttle test. The signal voltage reads anywhere from 3. The best way to diagnosis these slight differences in MAF signal is with a scanner that has a good graph display. Take a look at the MAF signal graph display below. It has something to do with the way the on-board computers operate.

The signal are pretty much in correlation with each other. Fuel trim is a very important data value to monitor and understand when diagnosing automotive drivability problems. For example take a look at the before and after pictures of the fuel trim graph display above.

When you do eventually run into a similar problem it will save a lot of time, but the key word is quick reference. If it takes you too long to pull up these snapshots then it defeats its purpose. Monitor your fuel trim at idle, if you engine is running lean your fuel trim is high. If the fuel trim comes down chances are you have a vacuum leak. The reason for this is your vacuum is lower at off idle and therefore less un-metered air is getting in to the cylinders.

Most likely the fuel trim would increase depending on the actual problem present. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry. Consult your service manual for its location if you need help. What does that mean? Basically this means that an oxygen sensor in bank 1 has detected a lean condition too much oxygen in the exhaust.Data from the MAF sensor is used by the engine control unit to calculate the correct mixture of air and fuel that the engine needs.

Changing the mass airflow sensor on a Chevrolet is very easy and takes less than 30 minutes. MAF sensor is located near the air filter housing as shown in the following picture. Press the red clip slightly to unlock it. Unplug the electrical connector from the mass airflow sensor.

Chevy Blazer P0102: MAF Sensor – Circuit Low

Install the new MAF on your Chevrolet. Tighten the screws so that they are snug. Plug the electrical connector until it locks in place. The check engine light will require a few days of driving to reset on its own.

Or you can use an OBD-II scanner to reset the check engine light as long as there aren't any other fault codes present. The mechanic advised that this needs to completed ASAP.

chevy trax mass air flow sensor cleaning

I told him I can not afford the service right now and he told me that this may cause me to loose my warrantee coverage on my transmission? This sounds kind of fishy, labor at You can change it yourself though, it is very simple. As far as you loosing the transmission warranty, that I am not sure about.

Putting in a new MAF will do absolutely nothing to the transmission but help your car run better.

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Tell them to get bent. Read More. Search Content Search Content. The engine runs lean or rich.