“Running rich”means there is too much fuel and not enough air in each combustion cylinder. If you experience any of these symptoms you should examine your vehicle as soon as possible. These issues can create dangerous situations causing accidents and injury. This could happen while speeding up on the highway on-ramp or cruising down a city street. You’ll experience this as poor drivability such as hesitations or sudden jerking motions, particularly during acceleration. Stalling, jerking, or hesitation during accelerationĪ bad MAF sensor can cause too much fuel to be left in the combustion chamber, creating untimed detonations. There are 3 key signs that may indicate it’s time to examine your MAF sensor. This causes the engine computer to miscalculate the amount of injected fuel, causing additional damage to your engine. A contaminated or failed mass air flow sensor cannot measure the amount of air flow correctly. Peace” Jay R.Ĭopyright 2010 : Engine Basics.The mass air flow (MAF) sensor, part of your vehicle’s electronic fuel injection system, is responsible for calculating the total amount of air entering the engine. So much mis-information on forums, good to read some solid info. Thank you for showing the REAL easy way, and saving me some money.” Joe Sĭon’t have any questions, just wanted to say thanks for putting this info out there. Info from every other site I looked at, only said how to do it using costly special tools. “Thank you, for the info, on your site, on how to remove valve springs, and install stem seals, using normal shop tools. **TO SUBMIT AN ARTICLE TO ENGINE BASICS PLEASE CLICK: CONTACT US! If you enjoyed the information and article you just read be sure to check out our newly released book with even more exciting photo's and information:īelow are just a few of the articles found here on Reading Spark Plugs ***Remember*** to check for other relevant information in the columns and article tables. Most have a built in AIT( Air Intake Temperature ) sensor so you can monitor your actual air intake temps at the sensor. Because of this MAF sensors have a tendency to get better MPG’s (miles per gallon).Ģ. The amount of CFM entering the motor is VERY accurate even at low air flow levels. Sensor reads actual load so there is no guessing what load level the engine is seeing.ġ. While both sensors accomplish the same thing we could give the +’s of each.ġ.Ğven if an intake pipe blows off or there is a vacuum hose leak the car will run the same, as the actual manifold pressure will not be any different so you will not be left stranded some where.Ģ. Because of this, MAF sensors can be harder to tune based on the interpretation of the ECU for a given air flow. What can be confusing when dealing with and tuning a maf sensor is that the computer will often interpret the MAF data to depict an actual load value instead of an actual number in CFM of flow. It measures the mass of air that passes by the sensor and outputs the actual flow of air to the ECU. A maf sensor is a device that measures the mass air flow, hence its name. While there are many kinds of maf sensors let’s focus more on what they are. When choosing a MAP sensor choose a sensor that will be appropriate for the amount of vacuum and pressure your particular motor will see. Bar is the metric unit for pressure while PSI is the standard unit. These ranges are often given in the unit of Bar instead of PSI. If the car is equipped with Forced Induction, then this sensor will be in charge of not only detecting the vacuum but the actual positive pressure in the manifold as well.īecause this sensor must cover both vacuum and pressure they come in different size measuring ranges. On a naturally aspirated motor this sensor will be detecting the negative pressure found in the intake manifold which we call vacuum. It is a sensor that detects the pressure found in the manifold. So what do these sensors do and what is the difference?Ī map sensor is a sensor that is installed somewhere in the intake manifold or very close to it. Some cars are even equipped with both a MAF and a MAP sensor….example a Mitsubishi Evo X. Each EFI car today is equipped with either a MAF sensor ( mass air flow) or a MAP sensor ( manifold absolute pressure).
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