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9

There is no such thing as detectable "reversion" airflow to a MAF. Especially on a non turbocharged car. The MAF has no clue about the direction of flow, only how much energy it takes to keep the wire or film heated. I doubt that the "negative" aspect of your graph is ever seen. Even at idle, you shoud see 2-5 g/s. I wonder why the graph is kg/h... that ...


9

MAP = Manifold absolute pressure and is a sensor to measure vacuum, the computer calculates the engine air flow based on the vacuum, throttle position, and intake air temperature. The computer also measures the barometric pressure using the MAP sensor before the engine cranks, this lets the computer compensate for altitude, or how dense the air is. Typical ...


4

I wouldn't if there are no obvious defects in the housing. Sometimes parts stores will only sell items as the complete package. When buying a thermostat from oreilly's auto parts for my forenza the only thing they would sell me is the whole housing unit with the thermostat. When searching on ebay, I found the thermostat without needing to buy the housing as ...


3

Moves.. answer is a good one but you asked about advantages/disadvantages of MAF sensors. Disadvantages are: the sensor sits in the intake and thus restricts airflow. Airflow restrictions translate to performance restriction, particularly with vane style air flow meters. A simple example of this is the comparison between a Subaru STI MAF sensor and a ...


3

This is the calculation you're looking for. IMAP = RPM * MAP / IAT MAF = (IMAP/120)(VE/100)(ED)*(MM)/(R) Where manifold absolute pressure (MAP) is in kPa, intake air temp (IAT) is in degrees Kelvin, R is 8.314 J/°K/mole and the average molecular mass of air (MM) is 28.97 g/mole. Note that, in the above formula, the volumetric efficiency of the (4-cycle!) ...


3

Also, remember that MAF is a reading of the amount of air entering the engine. If you have a backflow issues (high backpressure) or even a timing issue where the valves are not opening and closing at the correct time (slack chains, jumped timing), your MAF sensor readings will reflect this as well. I know this post is late, but any who are looking into this ...


2

Yes, provided the following conditions are met: the units for the values MAF and fuel flow values are consistent. if you're using OBD-II parameters the values are usually in different units. In fact, fuel flow is usually volumetric (L/hr) and not mass flow like the reading from the MAF so you would have to correct for that by injector flow rate, I'm ...


2

It should be on or near the air cleaner assembly. It looks like a square thing with a 60 pin connector on it http://www.ford-trucks.com/how-tos/a/ford-f150-f250-how-to-clean-a-faulty-mass-airflow-sensor-361730


1

Well, it turns out that the 1996 Ford E350 doesn't have a Mass Air Flow sensor - hence the trouble finding it :-) Instead, it has a MAP (Manifold Absolute Pressure) sensor, which looks like this: And can be found here: Thanks for your help with this!


1

P0100 A code P0100 may mean that one or more of the following has happened: The MAF may be disconnected, or a wiring connection may be bad The MAF sensor may be faulty If the MAF sensor element is dirty use disc brake cleaner. Do not use Throttle body cleaner because it will leave a residue that will muck up the sensor. A residue on the hot wire element ...


1

This is gas cap check valve. I tried to edit my post but It would let me. So here is a follow up for clarification. The check valve in the gas cap helps to regulate the pressure in the EVAP system.


1

Milan, I recommend that you purchase a paper Chilton's or Haynes repair manual for your car. They cost around $30 at your local autoparts store. Many manufacturers have provided a 'secret' code that you can use to turn your check engine light into a blinking code reader. The instructions for that tend to be written in the repair manual (not all ...


1

There is no one-size-fits-all formula Perhaps an analogy can help explain why this is. The volumetric efficiency of an engine is analogous to a person's ability to fill their lungs with air. To continue with the analogy, the various OBDII parameters are like a person's vital signs, such as heart rate, blood pressure and O2 saturation. To say that the ...



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