"Wisdom my lad is never cheap!" (Terry Pratchett) - And were just blessed to have found a FLOW of information! 👍

I know he knows what he’s talking about because I didn’t understand anything he said in this video

Thank you for taking the time to make this video. My truck was running rough and rich. Cleaned the Maf sensor and it's like a new truck.

I have been struggling with a intermittent vibration at speed in a 2003 Camry V6 primarily going up hills. Symptoms were the car body and steering wheel vibrated. It felt like a out of balance tire (I just had the tires rotated) so I took it back into the tire shop and had the tires checked. I chased my tail trying to correlate the driving issues. Yesterday, the weather changed from sunny and warm (thin air) to cool overcast with light rain (thick air) and the vibration subsided! It had something to do with air density. I came across this video and you articulated how/why the MAF functions within the system. I was convinced this was the problem. I removed the sensor and cleaned , now Car runs perfect. You very seldom get to see subject matter experts on KZfaq. Thanks for sharing your knowledge.

I've suspected a MAF problem on my new car (first time with a turbo and aftermarket intake), and this told me everything I needed to know. Thank you!

LITERALLY THE BEST MASS AIRFLOW SENSOR VIDEO IVE SEEN BY FAR!!!!!! Thank you!

Have spent a lot of money on other senors and repair shop visits for my problem in a 2000 Miata. And after seeing this I purchased a mass airflow sensor and WOW, problem solved. Doesn't say a whole lot about the competence of mechanics in my area. This guy covered a lot in this video, but was all related to the sensor. Thank you for the video. It was well done. If ever in Midland Texas let me buy you a steak dinner and beer or two........................... Or three.. lol

Thanks for your help. I appreciate your expertise and you taking the time to share it.

Love the video.... Just trying to get an idle of why my ford ranger is running rough...and I like the way you expanded things... Should have a show...

Dude! You are a legend. Thank you for this spectacularrrrrrr explanation.

You just save me hundreds of dollars in repairs on my Jaguar with your explanation of how the MAF sensor works. I thought I had a vacuum leak that required a lot of labor to repair. I had installed a K&N filter on my S-Type and it started leaning out under heavy air flow. As long as the engine was cold and the choke was operating, no problem. But once the engine was warm, it would not rev over 3,000 rpm without the automatic ignition cutout coming on. The car drives fine as long as I kept it under 3,000rpm, which is about 73mph. Is that any way to drive a Jaguar? Hell, no!. So I replaced the K&N oiled element with a dry element ($16) and installed a new MAF sensor ($14.74) and the check engine light is out and everything is fine.

Liked the way he explained this. Even us girls could understand this. Great job.

Outstanding! Wish I (and the two mechanics who missed it) had seen this when my van was overheating. I thought it was running too lean and hot. They checked and replaced everything else - thermostat, pump, radiator, even the radiator cap without success. I suspect I probably over-oiled my air filter and or the MAF was just dirty.

Thanks. Have rough idle on cold start and I have to believe it is a vacuum leak by how you described the symptoms. Makes sense now.

Wow! Your video has made me understand a lot better on how this all works. Very educational and have to say the best detailed and informative video on KZfaq. Thanks for sharing your knowledge 👍🏻

Thanks, nice descriptive explanation of a mass airflow Sensor, you know your stuff. Thanks!

Thank you for a clean and clear video about the MAF system.

I actually understood what you said. Great presentation, it was very informative.

very good information. you have described half the problems I have experienced before. Thanks Fastuun

Best info I’ve seen on the subject 👍🏾

I been trying to get my truck to pass smog since 2017 and I been trying to figure out this lean code I been having for years ! A/F to lean bank one sensor 1 so I have changed both 02 sensors, didnt work , installed new cat converters still don’t work , changed MAF sensor still nothing ! But I do have a k&N intake and the MAF sensor is mounted underneath instead of facing up “. You just gave me so such valuable information That I been trying to find for years “ so last week I did clean another filter and sprayed some of that oil on and yesterday it’s giving me all kinds of idol problems “ codes popping up like crazy “ cylinders misfired ‘ just making my truck sound like crap “ so when you said it that the MAF can get coated because of the oil 💡. I hope it’s because of that I’m about to find out right now thank you so much

Great presentation. I never post anything online, but I felt it pertinent to mention how well that information was delivered and presented. Thanks for that. Good stuff, Cheers.

Wow is all I can say. Amazing video! Thank you for taking the time!

Nice walk through. If I were ignorant enough to not understand terminology... I'd look it up. You did an excellent job A-Z.

Wow. I feel I should get a diploma or certificate in Mass Airflow! Great discussion on the topic!

I wasn't expecting to get schooled by shawn, this guy is great! He protunes my car.

Thanks You solved a car problem I had 20 years ago Great video !

really informative video, thanks! could a MAF sensor problem be related to cold weather starting issue? car runs fine in mild and hot conditions!

I have a 2012 wrx but im getting a exclusive fuel trim code running very rich .cleaned the maf and works great for a few days then it does it again . And no boost leaks. Started happening this summer the only thing different is that I've been keeping it in a air condition garage.

nice! lot of focused info in 10 min video. Really gets a guy thinking . Thanks for the knowledge!

Makes a lot of sense now..had my k&n filter on there along time. Thanks

I love this. I need this information. You know your story and you know about engines but please slow down. I will watch it again until I'm happy. Thank you for the explanation. It all and everything I was looking for. Thanx man and keep the info coming.

Good explanation pal. Thanks from the UK.

Great stuff! I almost feel like watching it again at half speed to catch all that information, lol

Very thorough information, loved the video!

This video is amazing! Good job in explaining everything!

Damn!!! U R smart as a Whip..very knowledgeable...Thank You!!!!

Thank you. Gr8 video. Ijust put a brand new maf sensor on my 02 325i BMW, and even if I unplug the maf sensor the car would stay idling as normal. In yr opinion what can cause this problem. Thank you.

Well said & spoken. I understood the layout of symptoms better the way he explained it.

Bravo! I didn't understand it all but thank you sir! Pretty sure my turbo Subie has a bad MAF. Will be replacing it on Monday :)

Good video and information; I really liked words toward the end of the video as how to test it.

Thanks again bro, you saved me 130 bucks.

helpful, my car has that problem ( audi a4 b8) I will have it cleaned abd see if the problem persist thanks.

I have a 16 wrx with a Cobb intake and I’m having negative AF learning 1 badly at like -20 to -30 and this only happens at idle and low throttle; it’s only a problem that has recently happened but the intake has been in for over a year. Where should I start to look first? Cleaning the maf or checking for a leak? And does this sound like a vacuum leak or a boost leak? I might have missed it in the video but I didn’t quite find what my problem is in the video

excellent explanation! Thank you very much.

wow- that was impressive. You just gave me everything I needed to know

thanks a lot , very good explanation theoretical, needs more practical on what you said the parts.. more zooming cam on the parts inside the engine thanks on all of it at the last I have to ask ::: ? what about the mass air flow controller if the conductive graphite has been removed or crushed or seems to be not conduct easy ?? is pencil graphite do any things better ? what to do please ?? azaad

Very good useful information. Very interesting is the explanation and diagnose of various problems. Many thanks

Last tip was a good lookout very close to home condition with my 325ci convertible 02. Gonna test and try cleaning maf and replacing my filter checking my O ring on my Disa and replacing my boots . Just got this car with only 77k miles but it sat obviously forever the engine is filthy below the covers . Was gonna go get familiar with the spark plugs after this anymore key tips ?

This is a great explaination for a layman to understand what and how the MAF sensor works and what symptoms occur and where the problem might be...thanks

good information, helpful

Great Video, Helped me alot... Thanks

nice video good explanation really good info appreciated thanks!

I get a P0101 code on a GM Truck w/6.0L. I have a cold air intake with a second intake hose ducted into the filter box, from an opening in my lower grill. Is it possible that the cold air being scooped in the second hose, is cooling these MAF wires too much? When I mash the gas pedal, the check engine light always comes on. I have a AEROFORCE Scan Gauge plugged into the OBD jack, so right away, I can clear to code and the check engine light goes off. My cold air intake uses a dry filter and not an oiled one. Is this affecting my fuel consumption by simply clearing the codes each time after I mash the gas? If I drive normally, it never comes on... but if I need to go fast, the check engine light almost always comes on. Please help me. Thanks. Dean

Very good explanation...I would just suggest that you explain the jargon terms like "rich" and "lean".

thanks and i agree, you should have your own show. telling me how the MAF acts, or not, tied into another issue i have.

Best MAF sensor video I watched

Thanks ...very informative

Great video. Very informative

Well explained Thank you

Great information!

Great video, thank you. Very informative.

Question For you ... i have a 93 mustang 5.0 and Im getting a 13 volt reading on the signal in and signal out wire when I should only be getting a MAX of 5 ... Any clue what could be causing this ??

Why do people just take 12000 plus views and only 53 bother to like . Good solid and comprehensive info thanks

Thank you very much I was having problems with the rotary specs on my inline girder 😂😎

I was wondering why my 1990 Olds 98 3800 is getting poor (20.1 mpg) gas mileage and I noticed the 1 wire was black with soot or carbon. I hope this helps. Thanks for the video.

by late subaru ru talking about the new 2015 wrx + or older?

What is symtomp of rough idle after car has been driving more than 1 hour and only more than 1 hour? At the beginning it was smooth. Thank you

Excellent explanation

Good information thank you.

Very informative thanks

I take my hat off, great video man, Thanks alot

do you recognize a problem when i plug in maf car stalls 96 deville.unplug runs. have been getting 1074 1071 lean codes for a while .checked leaks smoke machine.nothing changed intake gasket.and have done a few other emmission pluses.plugswires.e.coils.have a maf coming today hope its the prob.

Makes perfect sense. Thanks.

My allion 1zz 2003 is stalling at 110km/hr.It does not exceed that speed,any help

In your Subaru example would that cause a bucking or hesitation when boost comes on at partial throttle? Specially 2018 WRX.

Is there any engine temperature issue with the MAF? When my car hits 90F degrees it starts to fluctuate idle... Any help is appreciated!! Mahalo nui loa!

On a 11 Cube with a rebuilt trans & AutoZone mafs chcause the transmission traction control to activate? Mafs changed out again now trans ok.

Physics and mathematics in context... Hot...! Thank you, I now realise I have misdiagnosed maf symptoms due to misunderstanding causes... make alot more sense now!

So the ECM ignores the O2 sensor signal? what is it there for? if the AMF sensor on the intake and O2 sensor on the exhaust manifold and they don't match only one can be right.

real expert talk ! thanks lot !

Great video...thank you!

Good solid advice

I have a question? Would a dirty Mass Air Flow Sensor if dirty. Could it be a cause of a vehicle overheating in idol?

Very informative.

So yesterday my 1998 740il popped a p0301 and a p0300 right before my wife and I were about to go out of town and it was shaking bad and barely would accelerate. We ended up taking our van instead. I went and bought a coil for cylinder number #1, installed it and the car did the same thing. I took out all the coils from that bank and the spark plugs as well. They all looked good. I re-installed the plugs and coils leaving the new one out, disconnected the battery and touched the + and - togther, reconnected the battery and the car ran like normal with the slight miss it's had for the past 2 months. I pulled the MAF connector off and the car cleared up perfectly. I put it back on and the miss and slight shake came back. I was about to unplug it again and the car shut off when I touched the wires to the plug connector. Apparently the wires are frayed or something inside or at the plug. They're connected good enough that the car won't throw a CEL for it when it's connected but the mpg's are bad with it connected. I drove a round with it unplugged for about 4 miles and my mpg's are at factory spec, sometimes better like up to 20 mph in the city. When I shut my car off the CEL was back on with the codes P0100 P0130 and P0136. I understand the P0100 but any suggestions would be great. Thanks

props to this guy!

Information presented on a nice rhythm and concise.

Best explainer!

Great video! Thanks!!

This guy knows exactly what hes talking about!

very good MAF primer for tuners

What do you mean by " re-calibrating " the mass air flow sensor or plate?

I have a 2010 Hyundai Elantra with a rough idle. I have a Launch 123 i scan tool. The car idles really smooth with lots of power when it was when new , if I detach the MAF sensor. What should I be looking at? Gas mileage is poor and not as good power wise as when it was new. Drives ok. Could I have a hot wire issue. I have the shop manual form Hyundai . The scan tool will read live data, and I can save the data or freeze frame the data and print it. I notice the timing is erratic, and the idle speed drops down and then comes up! into the range it should be. Engine timing is nit smooth. I had the timing belt and water pump changed because of the age. It had no influence on the rough idle. What do you suggest ? Thanks EJR

What if you try to take out map sensor and take the one bolt on a 2016 Hyundai elantra so take the bolt and wiring harness off and it does not want to come out!? It moves left and right but it does not want to come out!? Thanks! Want to clean it but nervous to really pull it out hard dont want to break..thanks again

I have these codes on my 04 330i p0171,p0174 that would not clear after I reset the cel..i could not figure out why..i took off my maf and cleaned it and put it back on and the codes cleared..few days later they came back so I did the same thing and now they are back again...u think i should probably replace the maf?

dude, I learned so much from this video. gosh, thank you.

The video is an excellint explanation of the entire job.The video was a great learning privalidge. head of any one who turns there own wrenches

learned a lot of good stuff here! Great video!

Very good vid!