I'm sitting here with my OBD on my lap hooked up after replacing my MAF and this was the video I needed to explain the graph, Thanks.

every engine will be different so knowing what engine your testing helps

Damn. I wish that I had saw this before I went to the mechanic. I needed to know how to read this tool. Thanks for posting.

Great video thank you for the info. 2008 Chevy suburban would not accelerate smoothly from 1500 to 3000 RPM.. after 3000 RPM, the engine would surge with power. No engine codes present. Just by chance I had the original sensor replaced it after about a week of driving it must’ve recalibrated acceleration is back to where should be..

Thank you for making this video.

You’re videos kick ass dude. Thank you

Right on the point thanks

Thank you great video

Great Info thanks for this video!!!!!!

Thanks for info

Don't forget for correct readings engine must be up to operating temperature with no load to get proper reading. My vehicle for example says 2.0-6.0 gs at idle when warm which mine is 4.6 so it's fine on a cold start its 18-20gs until warm and this is mid winter in Canada. Before starting vehicle mine showed 1.8gs with key on. Also my vehicle specs show 7.0gs -20gs at 2500rpm mine goes to 15-16 gs 2011 pathfinder 4.0 Yet im still getting a p0101 code i changed maf to a new one erased code it came back put original one in came back so im stumped atm i did change my intake tubes as they were dry rotted and cracked also. Vehicle runs fine dosent miss or anything and drive ability is great

My PMAS HPX-E slot style mass air is reading .6gr key on engine OFF. A bad maf would explain my issue. Thoughts?

Ty

I measured my car, a 2007 Kia Optima, with a 2.0 engine... at idle, it was 2.3 g/s... and when I had double the pressure, it was 4-5 g/s.. Does this mean it is good??? Because when I removed it while the car was running, the car did not turn off and continued to run

GM, my 98 s10 4.3l engine light came on once I unplugged the sensor after the maf sensor, the truck was running and I just unplugged both sensors one at a time, after I plugged the last sensor back in the vehicle started idling a little high, and that's when the engine light came on, I don't know the name of that sensor is called

My maf sensor 40 g/ second in 2000 rpm, it is normal

Im at .43 engine off idle 4.2 in the 8s reved up

Is there a difference between gasoline and diesel engines? Because I have a diesel engine and the reading in operating mode is 10-12 grams. Is this normal?

I know this is a year old but if your still making videos could you maybe run though live data and kinda explain what the readings are and about where those readings should be at normal. Thanks

@gustavomartinez324

Ай бұрын

Look if u have 1.8 L engine u should be having 0.18 to 0.20 grams per second of airflow at idle that would be normal that is needed to overcome the parasite loss of the motor but at wide open throttle u would need alot more airflow since the ECM is multiply base air equation to knoe how much fuel to inject and injector on time in milliseconds but yeah if u have any questions feel free to ask

thanks heaps for this video, my 2.5litre turbo diesel has been idling rough and I figured it idles from 14g/s to 20g/s (fluxulates between those 2 values every second or so), and my sensor reads 1.53g/s when the car is off. I have ordered a new sensor online, hopefully all goes well.

@rigorsaif8973

10 ай бұрын

Did changing it fixed the issue?

@briansantos2206

9 ай бұрын

Here for answer as well

@Marinalin85

5 ай бұрын

​@@briansantos2206so am I 😅

@Eng_RAY

Ай бұрын

What happened to you?

@EliteTurtle05

Ай бұрын

@@Eng_RAY ended up being a suction control valve, not the maf sensor

How much IAT should be

Hi thanks for the video. I got a cuestion,,I hot a nbs 07 silverado I used a scanner and all the time it's reading 0.01 0.05 all the time,it doesn't reach at least 1.0 or something like that, always stays under 0.05 or so,will be a bad maf or is it normal,the same happens at idle no rech higer number like your video

@HVAC_Mechanic

6 ай бұрын

In general, at idle, an engine uses 1-1.2 Grams Per Second of air flow for every liter of engine size. So, a 5.3L engine should show around 5-6 Grams Per Second at idle.

Hi thank you for posting very good video. What if I have a 0.0 at idle?

@HVAC_Mechanic

Жыл бұрын

A MAF sensor should range around 2-7 grams/second (g/s) at idle depending on the engine.

@menombakglobalis

6 ай бұрын

1-1.5v at idle

@MechanicBundy

3 ай бұрын

What should it read at key on engine off opel insignia mine read 0 is that normal?

That’s great advice what engine size on the this particular car u have hooked up to

@HVAC_Mechanic

6 ай бұрын

This was a Toyota 1.8 Liter. I should have mentioned that an engine uses 1-1.2 Grams Per Second of air flow for every liter of engine size.

@gustavomartinez324

6 ай бұрын

@@HVAC_Mechanic yes sir needs minimum air flow to overcome the parasite loss of the motor

@gustavomartinez324

Ай бұрын

@@HVAC_Mechanic yea Kia and Hyundai use little more airflow at idle but you are more of a expert then me by the way great rule of 👍 thumb

At idle 750-800 rpm i’ve got 3.7-4 g/s when i double the rpm i get 5-6 g/s is this ok? I cleaned the maf

@userporpdasd

10 ай бұрын

U should be getting more

Will mass air flow sensor behave the same way?

@HVAC_Mechanic

Жыл бұрын

A MAF sensor is a Mass Airflow Sensor

Are you a hvac mechanic or auto mechanic?

My car shows 8.6 on avg grams/Sec When idle

So my mass sensor is reading 0 when the car is off but when the car is in idle or wrapped up in his reading anywhere from 0.245 to 0.84 grams per min so that does mean is bad and not reading high enough right lately I've been having ass admission cold give me with the mass flow air sensor but about a aftermarket one and it did not work any better

@menombakglobalis

6 ай бұрын

depend on the engine size & throttle body size...

@MechanicBundy

3 ай бұрын

Did you figure?

I changed 2 mass air sensor and both of them give me 0.0g/s the wire is good and the air mass fuse also is good any help please ?

@HVAC_Mechanic

Жыл бұрын

If the sensor and fuse is good it likely is in the wiring.

@kicknsystm

7 ай бұрын

I have a Nissan Xterra, it took a couple times for me to realize it would only cooperate with a genuine Nissan sensor. I got the original part# from the dealer parts dept. & searched online for the best price from there. Some brands only like their own parts.

@aliyooo12

7 ай бұрын

Thanks guys the problem was solved i got a original MAF and i dont have in problem now

Hi bro i really need your answer my IAT sensor tells me that the Air intake temperature is after i run the car for over 10 minutes 70° to 86°C but the weather temperature is 29°C and at night. Is it normal to get that hot?!

@HVAC_Mechanic

5 ай бұрын

If the IAT sensor is reporting a different temperature than what the air is, then it is likely bad, or the wiring going to the sensor is open/short. When they go bad, they often report high or low temperatures.

@MrSamiAlamir

5 ай бұрын

@@HVAC_Mechanic Thank you so much for your reply, I will check the wiring if not from them i will replace it because the check engine light is off i was wondering if there is a problem but the ECM doesn’t recognize it and thinks that the weather is hot and dealing with the issue as if it’s hot 😅.

👏🏾👏🏾👏🏾

So mine at maf is greyed out with ignition on and other sensors showing values. Showing no data. Is that a faulty sensor?

@mannys9130

9 күн бұрын

Do you have a MAP sensor instead of a MAF sensor?

@earthisfat6184

9 күн бұрын

@@mannys9130 no. I've got that car all figured out now tho. Fixed some bad wiring and rebuilt about 60% of the car. Been driving the hell out of it for 3 months now.

@earthisfat6184

9 күн бұрын

@@mannys9130 oh and after I fixed some other wiring the maf isn't greyed out anymore

mine is 3.46

So if I have a P0102 code registering low voltage for MAF, and this test shows the sensor is good, where am I?

@HVAC_Mechanic

6 күн бұрын

I would fix the low voltage problem. This is a rough test to see how the MAF sensor is working. The issue may also be intermittent with the sensor working good sometimes and not other times.

@starhawke380

6 күн бұрын

@@HVAC_Mechanic that's a relief... intermittent problems are the easiest to fix, right? ;)

do vehicles with MAF have IAT?

@mannys9130

9 күн бұрын

Usually yes

Mine is 0 .00 does this mean maf is bad .

@MechanicBundy

3 ай бұрын

Did it?

My stays at 0.01

@slowazzes1972

2 ай бұрын

Your probably in lbs/s rather than g/s

My scanner does not have grams per second. It has pounds per minute.

It was idling right around 800 and the reading was about 35 to 40. When I doubled the RPM The reading went to about 62. Does this mean my MAF is bad? Great info hank you

@HVAC_Mechanic

Жыл бұрын

It is close to double, so likely good. There are other tests that can be done. I would clean it up and try again.

@inmyexpression19

10 ай бұрын

Did you have a truck or car? Engins idle high at start up then go down after open loop

@HEADBANGRR

10 ай бұрын

@@inmyexpression19 car