what is a normal mass air flow sensor reading

A contaminated or bad air flow sensor will in most cases show lower air flow readings than a known good one. Engine at High Idle or Wide Open Throttle no-load 265v.

Mass Air Flow Sensor Reading At Idle Toyota Nation Forum

If MAF was bad to run 18 lean you MAF would have to be in the 34-50 range 18 less than normal.

. Mid throttle and WOT throttle can vary. You can also look at 20 for a little more information into MAF readings from this thread. Mass Airflow Sensor MAF readings of a 24L 4-cylinder engine at different RPMs.

The peak MAF reading should exceed forty times the engines displacement. If your truck is equipped with a MAF sensor it should read 21gs average with a functioning EGR hot and 32gs average without or disabled a EGR or the EGR is shutdown during a extended idle hot. Take the vehicle on a wide-open throttle test drive and record the MAF sensor signal in grams per second.

Mass air flow sensors typically either send a voltage or frequency signal to the powertrain control module PCM. In this article Ill show you how to test the mass air flow MAF sensor on your GM 38L 3800 vehicle without a scan tool. Dec 5 2010.

In this case a test drive was recorded Figure 3 on a 20-liter engine. Increasing the air flow leads to increase of the sensors output voltage. The mass air flow MAF sensor part of your vehicles electronic fuel injection system is responsible for calculating the total amount of air entering the engine.

If you are going to replace the MAF yourself then Id always recommend buying an OEM mass air flow sensor. Hot wire sensors typically have an operating range of 0 5 volts with idle voltage being around 5 8 volts and full throttle application is normally between 4 and 5 volts. To function correctly all of the air entering an engines combustion chambers must be seen by the MAF sensor.

As you may already know the MAF sensor is inside the round air filter canister assembly and this article will teach you how to test it. At zero air flow engine stopped the sensor output voltage should be equal to 098V - 102V. Now in case you wondering if this test applies to your specific vehicle this article covers the MAF sensor on 1996 thru 2005 38L V6 Buick Chevrolet Oldsmobile Pontiac 38L V6 equipped cars.

Often mass air flow sensor readings are measured at idle 1000 RPM 2000 RPM and 3000 RPM. The chart above shows that at about 5200 ft above sea level the density of air is 83 of what it is at sea level 0062 lbcuft vs. Key On Engine Off 0v.

A replacement mass air flow sensor can cost anywhere from 20 to 600. The MAF sensor simply measures the mass amount of air coming into the engine so that the PCM can add the correct amount of fuel. Will change MAF air flow readings but the readings should fall within a given range at the same engine speedtemp.

Otherwise the sensor is considered damaged. The 528 in this thread would seem to be out of range assuming the reading was taken at idle and in relatively the same conditions as the. With the engine at idle the MAFs PID value should read anywhere from 2 to 7 gramssecond gs at idle and rise to between 15 to 25 gs at 2500 rpm depending on.

A rule of thumb on a MAFs air flow rate at 500 rpm is 1 gram per second per liter of engine displacement. There is the full throttlefull load test others use and that is measure the MAF sensor readings at full throttle in 23 gear and the engine at maximum rpm. Ill answer the Mass Air Flow Signal reading question first by giving you the reference values in the service manual.

The amperage flow through the resistor changes because the electrical resistance of the resistor is responding to the cooling effects of rapidly moving air. A reading above the 135 to 140 range would indicate a lean fuel mixture or an air leak in the exhaust manifold ahead of the oxygen sensor. A faulty MAF sensor can cause your vehicle to run too rich or run too lean.

The forty times rule is relatively simple. Replacing a mass air flow sensor is fairly straight forward so most of the cost comes from the cost of the part and not the labor. So to account for the altitude you should multiply your expected mass flow by 083.

This sensor can also. Engine at Idle 136v. In general a hot wire MAF sensor produces an input to the PCM when a low-amperage electrical current is passed through a metal-film resistor suspended in the MAFs air stream.

Youll notice if the tailpipes eject black smoke or when the engine runs rough or backfires. Its always a good idea to test a Mass Airflow MAF sensor before replacing it. It looks like this reading is 907 gs so was your RPM about 833 or idle.

Output signal of MAF made by BOSCH is a variable voltage in the range 1 - 5V whose value depends on the mass of air flow through the sensor. This means that any vacuum or air leak downstream of the sensor will result in insufficient fuel metering causing a lean condition in open-loop operation and higher-than-normal fuel trim values in closed-loop. Edjack is correct that ambient air temp barometric pressure engine speed engine temp etc.

- So for example the 18L turbo engine rated at 180hp should have a max flow of about 144gs. Too little exhaust causes more air to be ingested by the engine due to lack of exhaust gas dilution and the. Testing the MAF Mass Air Flow sensor on your Ford truck or SUV or full size van is a very simple and easy affairThis article will walk you through the whole process without removing the MAF sensor from the engine.

The value you get should be 80 of the rated horsepower. Internal ignition coil arcing between the coil primary and secondary windings can be very difficult to trace. The 50 gs max flow reading that you are getting is far lower than what merely altitude can explain.

A mass air flow above specifications at idle can be caused by too little exhaust flowing through the EGR valve. In answer to your question 42 to 6 is correct MAF reading for warmed up idle remember its calculated PCM looks at IAT and MAS sensor frequency to calculate the weight of the air in grams persec.

Maf Lab Scope Waveforms