MAP Sensor - Manifold Absolute Pressure - Explained

What is a MAP sensor? How does a manifold absolute pressure sensor work? This video explains how a MAP sensors detect manifold pressure and use this information to determine how much fuel to inject into the engine cylinders.
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[@atothezeezee]

Everytime I google something to learn about my car, an Engineering Explained video comes up. Love this guy.

[@EngineeringExplained]

+atothezeezee Thanks! :)

[@sarfarash1]

Clear explanations, to the point and free of clutter! Great video! Thanks

[@troymatthews668]

Great vid. Has he got a modified faster car though?

[@shakemorgan8449]

Just as I'm about to click on another video, I see Engineering Explained and I come here first!

[@vladmorosanu]

Prior to engineering explained I would look for information on forums with a lot of schematics which are not easy to understand if you're not an engineer. I love this channel. It explains everything in a clear and easy to understand manner. Love all the car reviews as well. Massive thank you for your contribution to the world. The number of views do not give the importance of your content justice.

[@EngineeringExplained]

Thank you! Glad you enjoy the content!

[@EngineeringExplained]

Thanks, glad you enjoy them!

[@PolarSkyDesign]

Finally someone explains how it works in a way I can understand. THANK you

[@EngineeringExplained]

Very welcome, thanks for watching!

[@jerkhi7634]

+Engineering Explained wondering do u know code P2187 is that might Map sensor？

[@radurody9783]

Yessss thanks god

[@MultiPowerAid]

Hey man, you already helped me twice during these past few weeks. I'm currently taking a course on sensors and actuators and these videos that you make really help out. Keep up the good work!

[@westleyrich5418]

Brother I just typed map sensor into KZbin and you popped up and delivered an absolutely on point and excellent presentation thank you sincerely sir.

[@EngineeringExplained]

Haha I appreciate you watching all of my videos! Even the boring ones like the scuba regulators? And my plain white T's are comfortable and cheap, hopefully style doesn't matter for these type of videos haha.

[@salmanbharadia9951]

you just made my exam revision breakdown from one day to one hour awesome stuff thanks

[@JoseCigarroa]

You’re awesome man! Every time I have a question about one of my vehicles I can always find an answer here. Thank you!

[@brandieboi2000]

This is a great video! It explains exactly what a MAP sensor is and where it can be found in its simplest form. Nice work!

[@EngineeringExplained]

You are welcome!

[@kylestenger15]

Missed a day of tech school today due to Covid, this video is what I’m using to get up to speed and all your other videos aligned with the level of education I’ve received at college. Thanks.

[@EngineeringExplained]

TPS is on the back side of the throttle body, on the same axis as the butterfly valve (I have the maintenance manual).. I have a video on TPS if you're interested. I went to NCSU.

[@EngineeringExplained]

Excellent, I will message you!

[@xmet1]

Think you for your fantastic and easy to understand explanations of all this car automative electronic stuff. Great job!!

[@EngineeringExplained]

Awesome, good luck to you!

[@shanea9613]

Hi. Just wondering if you can do a video regarding EGR in diesels. I have been researching and found out the intake temp is less with the EGR as the EGR is cooled, compared with when people delete them. Something not many people would know. Cheers

[@stefanoiachella8588]

I would be interested in learning how spark advance is affected by Manifold pressure. Much HP gains can be had with the advance so that is an important topic. Great video, thanks.

[@EngineeringExplained]

Best of luck!

[@patrickphippspa584]

OMG! Baby Emo. Such a young puppy, but always incredibly intelligent. This guy has sustained and endured so nicely over time. Sure do enjoy you buddy!

[@musabfeltman1311]

Great explaination as usual Jason, I understand MAPs perfectly now. Thanks Jason and keep on making awesome helpful videos man. 👍👍👍

[@GMAN420BC]

It may be an old vid but its still relevant and useful information. Thanks for leaving it up.

[@EngineeringExplained]

Hmm, I'm really not sure. Do you have any engine codes? (CEL). Also, it could be an issue with the IAC valve (idle air control).

[@danielguimaraesscatigno4236]

Nice explanation! It would be nice to talk about the pros and against between MAF and MAP.

[@tqaquotes9379]

Quick & Clear & Relevant & Good information. Thanks

[@RyanKristoffRacing]

You know how excited it makes me to stumble across this old gem and see an Integra as your sample car? (I'm excited) Very cool to see how far this has come.

[@wolfpack4128]

@blankps3, an engine is basically a big vacuum. The pistons "suck" air into the chambers. The more it sucks the more power you get therefore the higher the vacuum. The throttle controls the amount of suction. It gets a bit more complicated as you add a turbo but that is the gist of it.

[@ashwingokhale24]

All the videos are absolutely amazing ! Helped me a lot in the exam preparations

[@EngineeringExplained]

Happy to hear it, thanks for watching!

[@Pali4life2]

i appreciate the info, my car has a MAF though, i read a little about my problem online and i think there might be some sort of leak in my pressure lines were the boost is and one of the lines fails when full boost is running through it. i'm going to replace all the lines and that will hopefully get rid of the problem! thanks!

[@EngineeringExplained]

That's interesting about the spacer, I've never heard of that though the logic makes sense. I should have a video on CAI's eventually, don't know when. As far as are they worth it? Ehh, most companies know what they're doing, and you won't see big improvements. The biggest difference you'll notice with a new intake is the sound, but that could be achieved simply by removing the silencer box around it. Also, you need to be careful that the rerouting of a CAI doesn't place it closer to the engine.

[@glasser2819]

the deal with "Cold Air Intake"... is to trick the ECM as if you're driving in cool Canada instead of hot Havana. Computer sees cold air and injects more fuel... Fav. quote: "There is no Replacement for engine Displacement!" 👍

[@garydenny7904]

Brilliant teaching as always

[@elijahking1985]

Great explanation, It really helped. Thanks!

[@petemorales7889]

Good job. I love watching your videos.

[@jctyoga]

Great videos for ASE A1, A8, L1...

[@angelwolf2358]

Thank your informative video. I know a good bit, but this helps tie things together easier

[@EngineeringExplained]

Well keep in mind it can also use the O2 sensor to close the loop up and provide another data point to verify/alter the A/F ratio. It is very cool though.

[@NEWNATURE777]

Great explanation Jason as always. So vehicle's computer will not look to the MAF sensor to check air to fuel ratio, but will bypass it and go to the O2 sensor to calculate the amount of fuel to mix with the air.? Cheap gain power 🤔

[@bsriveria]

Great video, well explained.

[@perezrudy2011]

Thank you for this video!

[@TheELiTeintruder]

hey there,,im really enjoying ur videos..im doin mechanics along time and its nice to get information from all angles and i must say you explain it very well...also very informative and very interesting,,,thank you,,looking forward to future vids,,,,,

[@littlerobbo8185]

excellent explanation

[@molochlight]

Good Info...thanks for posting.

[@josephkimonyi]

nice tutorials. much appreciated. keep it up

[@ziaulhassan8171]

Excellent lecture thank you

[@mohitgarg802]

Simply Explained. Thanks

[@alejandromartinezarrieta8871]

You are a freaking genius. Thanks so much

[@EngineeringExplained]

Not sure, I'd try googling your problem and seeing what comes up in VW forums.

[@sahanahohara4690]

Thanks so much teacher I'm just a kid and I can understand your explanation,its so easy.thanks alot , Engineering explained

[@traintour3763]

this must be one of his earlier vids still really good!!

[@clearskyy]

awesome, just what I was looking for

[@marcoflores1764]

Great job buddy, thank you

[@beetlesuzuki72]

cool video, not sure if you can help but I have a 98 Toyota tercel that runs crazy rich only at first start in the morning and only when its below 40 deg outside. there are no dtc's I've tested the o2 and replaced the coolant temp sensor, also checked for leaky injectors. the exhaust smells like raw gas and smokes for about a minute at cold start. if its warm out no smoke and no gas smell also no engine miss and I replaced the valve seals. this thing really has me stumped. Thanks chuck.

[@codyd.18]

I’ve been checking out my map readings on my scangauge and noticed that the map reading at idle is higher than when I lift off throttle and the rpm are dropping. Why would an engine at idle create more pressure than an engine that is revving down? Is there vacuum created when fuel is cut yet the pistons are still cycling? Thanks man, love your videos.

[@hayerubihayerubi5720]

Proper video. Good explainanation my friend 👍

[@jamestaylor1274]

good and clear not confussing

[@ranjithshreyas]

Well explained.

[@spartangodzz28]

Hey man, you're videos are great. I'm applying to college and hoping to be a mechanical engineer.

[@movingupautodiagnostics8645]

Hey Jason, which system do you think is more reliable? Speed density or air density?

[@EngineeringExplained]

Yes.

[@richardgordon8707]

very well done nicely explained ! question i know my car has a maf sensor ( mass air flow sensor ) i believe it also has a map sensor ? i have not removed it to make certain ..But is this something car company's do use both ? any feedback would be appretiated..thank you !

[@jada7493]

Love your videos.. can you make one about how speed limiters in cars work... electronic speed limiters that you can manipulate from the steering (it's available in some new cars in europe, not sure about US models)

[@jaimieconroy36]

I always enjoy watching your videos. I learn so much from them, and like to learn as much as I can about cars. I have a trouble code, P0108, MAP sensor voltage high. You mentioned that cars that have a MAP sensor don't have a MAF sensor, but my 2016 Honda Fit has both. I am concerned that this sensor may affect my engine and needs to be replaced. Is this the case or could it be cleaned and have the trouble code reset?

[@elmaancy]

Thank you man ! I was looking for that for a while..so if you let me ask what would happen if I changed the size of the air intake and the filter or the intake manifold for the same oem map ?

[@Carrera911Fan]

i know ive said this maybe a couple of times but is that clutch video on its way :)

[@JoelGarciaJaquez]

well explained!

[@SnoboardAssassin]

I've said it before and I'll say it again, you are the bomb! I decide to learn about how engine computers and sensors work and i see MAP sensor somewhere, "what's that mean?" i think. first thing I do is google Engineering explained MAP sensor, and boom, you have a video already made for me! haha thanks for all the help man!

[@EngineeringExplained]

Hunter Fenn Nice! Glad you find it helpful!

[@muscleshawty1995]

Engineering Explained haha same thing happened to me!! i was reading about sensors on the engine and didn't understand how MAP sensor works so i googled it and UNSURPRISINGLY you show up. :D

[@fuzzybrowd]

hey guy.. i have to say massive thanks for explaing this to me.. hmm the more you know now right.. thanks a lot have a awesome evening

[@Lendog19v2]

Excellent video! So one of these along with the proper ecu can eliminate an afm or maf? ...and are the inputs from the 3 sensors processed by the ecu to maintain a constant ideal air-fuel ratio, or does it get much more complicated?

[@EngineeringExplained]

Thanks! ECU's typically will control the amount of fuel injected, this is not a fixed amount.

[@GalaXy808]

I really like explanation wow!

[@Penafort]

Great channel man. Plz some day explain the limited slip differential :-)

[@mauricetheune]

The ecu doesn't change the signal into a voltage, the sensor itself does that. Great video by the way :)

[@tonyliu9982]

Really enjoy all your videos, thank you. I was wondering, could you do a comparison video of MAP vs MAF sensor? Can't tell if one is "better" than the other.

[@jameshaulenbeek5931]

A MAP sensor measures the pressure in the manifold. A MAF sensor measures the volume of air flowing through the intake *prior to entering the throttle.* MAF sensors can be problematic in forced induction and high performance engines as they don't measure the *direction of air flow,* only the volume of air. When the throttle snaps shut, you'll have a pressure wave of air moving back out the intake, which the MAF sensor will read as a large volume of air. This will cause a potentially harmful rich A/F mix to exit into the hot exhaust. In that scenario, a MAP sensor will see a drop in pressure in the manifold, and adjust fuel injection accordingly. Generally, if you're building a high performance engine, especially a turbo engine, you'd be better off running a MAP sensor. I got this information from watching a video by HPA, High Performance Academy. They're also a fantastic channel - racing team that's based in Australia that's been building race spec engines for many years.

[@fc3sking119]

could you do a video explaining what a Emap canister is, thank you

[@MrAsianmusiclover]

thank you for the explnation... new subscriber here...

[@osvandremolinari]

Hello So if a motor uses the MAP sensor will not have the MAF sensor? Your videos are great.

[@nickd7386]

Thank you. very good explanation, Doesn't seem like a lot of work to simply replace the IAP sensor when it goes bad. Would you say 10 or 15 minutes if at that. Are there other adjustments that must be made after the sensor is replaced

[@schammo8893]

Hey thanks for the video I was reading that the map helps the ecu determine the engine load. Just a query if car is in neutral and you rev it to 2000rpm and compare this to lugging a car up a hill at 2000rpm how do the pressures change is it just because the throttle plate will be wide open in latter case?

[@saracen7774]

love ur vids bro. hav u explained a fuel pressure regulator and would u hav to increase fuel pressure when u increase boost?

[@Reapr98]

As someone who subbed only about three or four years ago, seeing you this young is seriously odd xD excellent explanation though as usual!

[@wongbryson]

Hi, would you explain the air bag system? Thanks!

[@mickblock]

so why is it called manifold absolute pressure? instead of just manifold pressure? seriousely am I missing something? btw thank you for these videos. your enthusiasm is contagiouse!

[@dhasuvdd]

Useful info

[@samuelhurtado7968]

Very useful information, you explained it very well, but I do have one question what would be the symptoms on a engine when the map sensor is not working properly or at all. will it still turn on or will it turn on only for a few sec then turn off ? I ask because my vehicle has 2 map sensor and one flow sensor.

[@2391jessie]

You need to do a video of tuning ITB (4D tuning TPS/MAP vs RPM)

[@EngineeringExplained]

You can find more info on my channel page haha, there's an "About" tab.

[@adamlisowskiselby680]

what symptoms might u experience if your map sensor fails? poor acceleration? rough idle? thanks adam

[@beachbum0014]

Nice job, buddy

[@HuaRenHoooo]

hi can you explain increase fuel injection by how? I mean by extend injection time=duration or tell the fuel pump to work harder..? and what the fuel regulator build for then..

[@juicedd9646]

I recently installed a new performance intake into my car so does this mean I need to get it retuned to the new intake ? Because I got a check engine light and I'm pretty sure it's because the sensor was tuned to the factory intake. Thanks!

[@EngineeringExplained]

Honestly I'm not too sure. From an engineering standpoint, I feel like a MAP would be an improvement as it doesn't put anything in the way of blacking airflow, and doesn't have resistors that are in the airflow's path that could get dirty or be damaged. But I believe both are still used today, though perhaps not.

[@ramm7eleven730]

nice and very interesting!!!

[@EngineeringExplained]

Well the clutch pedal itself (as I recall) was requested about a week ago. Having said that, I still have requests from a year ago that I haven't completed. Takes me a while to get around to things, as there are many, many requests. I do my best. I can't promise it will be anytime soon, but it's on my suggestions list and I do plan on working from this list when making videos. Thanks for watching!

[@lsdka24]

Good Job!!!

[@RussellBooth1977]

Yes,my brothers 2000 model Subaru Forester is playing up at idle speed particularly when it's warm,I've went through & checked for air leaks which I got rid of but the engine keeps surging 15 minutes after the engine has warmed up. So,on Monday I hope to do a voltage test using my multimeter & a vacuum pump & gauge to see if the sensor is putting out the right voltage because I've ordered a hand held vacuum pump to test it with. I need to test it because they aren't cheap at $400-$700 AUD for a new one,I might buy a used one or something if that's what my brother wants !

[@sonasson5578]

Thank you sir

[@vincentgrett2855]

Nice explanation. I'd welcome a video explaining the different purpose of the MAP sensor and the MAF sensor. I think their functionality overlaps but the MAF sensor gives a more reliable reading of the volume of air at higher RPM (with the throttle open) whilst the MAP sensor gives a more reliable reading at low engine speeds (where the throttle is less open). Any inputs most welcome.

[@phatvu3811]

I think the MAP sensor is important to set the ignition timing. More MAP pressure (higher HP) the timing is advanced where as less MAP pressure (lower HP) the timing is retarded. The MAF is for fuel mixture control. The ECU is metering the fuel based on the airflow. In the real world, both work in conjunction to maximize you engine HP in an efficient way. When you step on the gas pedal, you demand more HP from the engine and the end result is higher MAP pressure + higher MAF air flow. The ignition and fuel metering adjust themself to provide the optimum HP

[@vincentgrett2855]

@@phatvu3811 Thanks, that makes a lot of sense! :-)

[@beinspired142]

hi can you explain what is piston-type economizer?

[@abedj1220]

Great Video. Is it possible my 99 pontiac 3800 has MAP and Mass Air flow sensor. I know I have had to replace the Mass Airflow sensor before and that was a sensor that was in the middle of the intake in the throttle body. I also seem to have a MAP on the throttle body as well but not sure that is what it is but my service manual shows me the schematic of a MAP so I assume I have one of those as well.

[@oberlyabanto2499]

Sir I have this problem of my honda accord 2000 6 cylinder it’s hard starting when it’s warm but after an hour that I turned off the engine it’s always quick starting. I did the electric test to the MAP sensor the voltage don’t increase when I open the throttle. Thank you so much for your attention

[@jelanijohn4867]

Can you do a video on a EMS sensor? Please and thank you

[@fioswild]

Really cool!