However, a dysfunctional mass air flow sensor would mean the ECM may not provide enough fuel injection for prompt engine starting. It is often observed when a car starts for a second then dies. Starting an engine requires a greater quantity of fuel than idling. Hard StartingĪ difficulty in starting can be a symptom of a bad MAF sensor. Surging or HesitationĪnother of the major mass air flow sensor symptoms occur when the mass air flow sensors are not working properly is abnormal power surging or lacking during cruising or acceleration. A symptom of a bad MAF sensor is that it may overload the catalytic converter as well. Sometimes a bad ECM can cause black smoke to come out of the vehicle’s exhaust system. This makes a decrease in fuel efficiency one of the symptoms of a bad MAF sensor. Poor Fuel EfficiencyĪ faulty ECM may result in addition of excess fuel than required, which will lead to greater fuel consumption. Therefore, one of the faulty MAF sensor symptoms will directly result in rough idling due to the wrong amount of fuel. Smooth idle is only possible with the right quantity of fuel. This can be limited injection by the ECM may be limiting injection because of a faulty MAF sensor problem. One of the dirty MAF sensor symptoms occur with accelerating especially when onto the highway.

You can find out the codes from OBD scanner and if it is P0101- Mass Air Flow Sensor Circuit Range/Performance, there may be a dirty MAF sensor. However, misfire codes and fuel trim may also lead to a mass air flow sensor damage. This could be due to circuit diagnostic trouble codes. Check Engine Light OnĪ bad MAF sensor can lead to illuminated check engine light, one of the warning lights on car dashboard. You need to know these and study your vehicle carefully to know when it is time to replace the faulty mass air flow sensor of your vehicle. There are quite a few bad MAF sensor symptoms. WHAT ARE THE SYMPTOMS OF A BAD MASS AIR FLOW SENSOR? A mass air flow (MAF) sensor is a car part that measures the quantity of air mass flow into an engine’s inlet. This can result in critical car problems. In the case of a bad mass air flow sensor, the fuel injection is not correctly calculated by the engine control model or ECM. This measurement is important to estimate how much fuel is required for the ideal air-fuel ratio (AFR). What is a MAF Sensor?Ī mass air flow (MAF) sensor is a car part that measures the quantity of air mass flow into an engine’s inlet. There are a few symptoms to identify a bad MAF sensor and replace it in time. However, with time and usage, these sensors might degrade. To achieve that, several sensors are assembled including fuel injectors, camshaft position sensors and mass air fuel sensors or MAF. Modern cars are fitted with advanced electronic engine controls that estimate the right amount of fuel to be used in any situation.

Ford 6.7 mass air flow sensor problems