Service Done Right #13: Mass Airflow Sensor Testing – Is The Sensor Lying To The ECM?

My car skoda Octavia TDI 2018 shows 3 codes, P0103, P0341, P0113, what part should i replace?

Leaking intake valves. Blow back into the intake manifold...
Tight valve clearence? In hondas for example? Wich code will it be? 101/102/103???

Nice information, would i be able to get a copy of the mass air flow sensor calculations formula? it would be nice to have and to use it at the dealer. ive had fuel trim codes lately and im always second guessing when im looking at my mass air flow readings.

Hello sir I'm new to this I have ford f-150 5.0L 2013 it hesitates an shows code for mass air flow sensor P0113 circuit high input an IAT P0102 circuit low input an on scan tool mass air flow sensor reading is 2.36 -2.36 no changes Any help is highly appreciated

Hi, I would like to get the VE spread sheet please.

Thank you sir for sharing your knowledge

Hello , can i have the spread sheet ? Thanks
Regards

Also Can you link me to a VE calculator ?

I have a 3.5 liter engine so are you saying my MAF should read around 3.5 g/s at operating temperature at idle? Mine is reading only around .6. Is it bad? Can something else be causing this reading besides the maf?

I have a p0170 code. The car runs perfect no hesitation no variable idle. Stressing because I only have 3 weeks to get this to turn off CEL light and pass emissions .any help much appreciated

Very nice n thorough

So far all the aftermarket stuff I’ve gotten from Delphi Technologies has been crap. Thanks for the video but step up the quality.

Would if you have a rough idle to stall issue and while the engine is running, you disconnect the MAF sensor and the vehicle will idle almost perfect, you can plug it back in and the engine will remain idling good and drive good but as soon as you turn the vehicle off or disconnect the battery then restart it the rough idle returns until you disconnect the MAF sensor again. The vehicle is a 5.3 silverado 08, this is all happening with a new MAF sensor since I just replaced it when the engine started acting up. I have been chasing this problem for quite some time and have replaced sparkplugs wires, coils, tps and I decided to check out the MAF sensor again when I discovered this anomaly. I don't know whether to get another MAF sensor or chase down wiring.

pete if you do read this I was told by a tech that the mass airflow sensor was only there to check if and how much is added when the egr is opened as the ecu knows exactly how much air goes in based on engine rpm air temp and cylinder volume is this true , my 1400 deisel ran without mass af sensor , as had a broken lead in maf plug , only set a code

HI Pete, have a question. 2001 f150 5.4, with my scanner had lean codes and noticed no voltage reading on the maf sensor. I have 12 v going to it and a good ground, but do not have and voltage at the signal wire. Hoping its not the ecm. Any ideas?

I've read and watch your videos...they are very interesting and informative...I really learn a lot from these videos

Great explanation of what is happening and what to look for. If you scanner cost less than $100, most likely your are seeing "Global PIDs" as required by law. Fun fact?
This was a value test we rigged with a voltage drop on the ground side at GM training centers in 2002, but even more relevant today as fuel prices increase. And never forget engine wear, compression, intake leaks, timing chain stretch and incorrect tire size will change load values! Great video...
DK, ASE master, retired.

Maf shows average variance out of range at idle when driving shows normal what does this mean when out of range shows 2.26

GREAT Job🎃 keep them coming.

If the Cat is partially blocked , will it affect the reading ? That would restrict the air flow . Or you can get the E Scan Elite from ATS ( Bernie Thompson ) which has a VE calculator built in !

I do have a question, how shoud I get the data from my mechanical transmission in the case stated in the video when shift from 1st gear to 2nd for auto transmission?. Thanks in advance. By the way, great video as always.

Does this work the same with diesels? Like gen 4 Ram 6.7L. being a diy, I am trying to gain all I can about my engine. thanks for sharing your information.

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can i have a spreadsheet please

Can I get the ve calculator, Pete?

1g/s for 1 littre is not always true specialy with BMW engine and I don't know why .. in normal operation the 1.6 engine have 2 g/s in idle.. maybe the valvetronic system is affecting something

Hey, Pete. Since the MAF sensor is the primary source for calculating absolute and calculated load, can you just look at the calculated load value pid and make a decision based on it? Over 85 % is what I heard is okay for non- turbo or supercharged engines.

Thank you pete for this educational tuning video it's amazing how one individual sensor can make or break you.

Thanks Pete! You said that the MAF should read about 1g/s per liter of displacement ( I am guessing per 1k RPM) is that correct? So on a 02 Corolla with a 1.8L motor at 700rpm I get 1.81g/s, does that seem about right? I have. P0171 with long term fuel trim at 25% (constant) and short term fluctuating between -10 to 12% when driving. Since trim doesn't get better with higher RPM I have moved on past a vacuum leak and suspect fuel side. Since it has also developed a harder time starting after sitting when hot (1/2hour sitting after running into a store). Any thoughts?

I've read an article from your collegue Scott Shotton how to modify the VE calculator and get accurate number on turbo engine. If one works on a turbo engine you just need to gather what the pressure in the intake is while doing the VE test run. You can either use factory MAP sensor if equipped or install pressure transducer. Collect the map sensor data in "psi" reading. Then multiply the reading by 2 in order to convert in "inHg". Then add the calculated number to the current barometric pressure(inHg), at the altitude the test drive was performed. Then input this final calculated number in the VE calculator "barometric pressure" input. Man i love MotorAge 👍🎸🔧🥃

Thank you Pete for sharing your time and knowledge.

Can I please have the spreadsheet?

👍 thank you

are you using both bank 1 and 2 STFT or one bank? thanks

PROFICIENT Sir Pete Meier Motor Age
My teacher
Sharing it thank you very much helpful information video
Take care and have a great Evening
PROFICIENT Sir Pete Meier Motor Age
ASE =Automotive Service Excellence
Richard McCuistian was ASE Master Automobile Technician For over 50 years Certified by Automobile Service Excellence for over 50years he deserves a interview 🙏 please thank you
Sir Pete Meier Motor Age
From Nick Ayivor from London England UK 🇬🇧

Can you tell me where this is on my 2013 Jeep Grand Cherokee. All I can find is a small air temperature censor . It’s a3.6 engine 🤷‍♂️

Hey Pete could I get that VE excel sheet?

Now that's a new one I've never heard or even considered diagnosing specific sensors in global OBD2 because of the difference in the data...

Superb explanation and testing . Thank you. Please send the maf testing sheet.