The chemicals are just too harsh and can damage the plastic. There is an example posted in the video to follow. You should never use carburetor cleaner on a mass airflow sensor. I have an important tip for you that I learned the hard way. On older vehicles that don’t have this function, a cleaning will be necessary at some point. It works by super heating the sensing element to burn off any contamination like a self cleaning oven. Vehicle manufacturers eventually built in a self-cleaning mechanism into the part. Unfortunately, it can change the operation of the automobile for the worse.Īs an example, in 1994 Ford came out with a technical service bulletin as well as Mazda, that outlined the test procedure for a contaminated mass airflow sensor. Any vehicle with over 20,000 miles might experience problems due to contamination buildup on the heated element of the MAF sensor.Īs a rule of thumb, the older the vehicle the more likely this problem is.
This can display the same problems and symptoms as a defective part. If there is no vacuum leaks and the air induction hose is in good shape, it’s possible that a dirty mass airflow sensor is the problem. Thus, symptoms and false trouble codes indicating a sensor failure are likely. It allows air to enter the engine without the computer knowing about it. This is a common condition on older, high mileage vehicles. It’s when the air duct that runs from the air filter housing assembly to the throttle body is torn. In this scenario air bypasses the flow sensing element and you get a lean condition.Here’s another situation where the mass airflow sensor gets bypassed. This is where air gets pulled into the intake manifold without the computer knowing about it. Check for things that would be more common then a defective part.Ī vacuum leak is an excellent example. This is why you still need to start with the basics. It can be a wiring issue, problems with the sensor itself or an actual air flow issue. Take a P0102 for instance, which stands for low air volume or input signal to the computer. However, when the MAF sensor malfunctions some faults will actually be symptoms of the root cause. Often you can narrow down diagnosis using the set trouble code. I have seen random misfire codes and o2 sensor faults set.
This depends on how bad the car is running. The mass airflow sensor can turn on the check engine light and set some strange codes.
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