MAP Sensor - Manifold Absolute Pressure - Explained

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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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13 ноя 2012

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Комментарии : 434

@atothezeezee 9 лет назад

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

@EngineeringExplained 9 лет назад

+atothezeezee Thanks! :)

@sarfarash1 6 лет назад

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

@troymatthews668 4 года назад

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

@shakemorgan8449 3 года назад

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

@vladmorosanu 8 лет назад

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 8 лет назад

Thank you! Glad you enjoy the content!

@PolarSkyDesign 10 лет назад

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

@EngineeringExplained 10 лет назад

Very welcome, thanks for watching!

@jerkhi7634 7 лет назад

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

@radurody9783 5 лет назад

Yessss thanks god

@EngineeringExplained 11 лет назад

Thanks, glad you enjoy them!

@MultiPowerAid 4 года назад

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 3 года назад

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

@EngineeringExplained 11 лет назад

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.

@JoseCigarroa 6 лет назад

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

@salmanbharadia9951 8 лет назад

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

@brandieboi2000 5 лет назад

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 10 лет назад

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).

@elijahking1985 10 лет назад

Great explanation, It really helped. Thanks!

@kylestenger15 2 года назад

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.

@ashwingokhale24 10 лет назад

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

@EngineeringExplained 10 лет назад

Happy to hear it, thanks for watching!

@EngineeringExplained 11 лет назад

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.

@musabfeltman1311 5 лет назад

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

@stefanoiachella8588 6 лет назад

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.

@josephkimonyi 8 лет назад

nice tutorials. much appreciated. keep it up

@patrickphippspa584 4 года назад

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!

@bsriveria 11 лет назад

Great video, well explained.

@danielguimaraesscatigno4236 6 лет назад

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

@EngineeringExplained 11 лет назад

Excellent, I will message you!

@EngineeringExplained 11 лет назад

Best of luck!

@EngineeringExplained 11 лет назад

Awesome, good luck to you!

@shanea9613 4 года назад

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

@molochlight 9 лет назад

Good Info...thanks for posting.

@wolfpack4128 10 лет назад

@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.

@petemorales7889 4 года назад

Good job. I love watching your videos.

@GMAN420BC 5 лет назад

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

@RyanKristoffRacing Год назад

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.

@EngineeringExplained 11 лет назад

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

@marcoflores1764 5 лет назад

Great job buddy, thank you

@EngineeringExplained 11 лет назад

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!

@ramm7eleven730 11 лет назад

nice and very interesting!!!

@EngineeringExplained 11 лет назад

You are welcome!

@EngineeringExplained 11 лет назад

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 2 года назад

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 🤔

@JoelGarciaJaquez 10 лет назад

well explained!

@xmet1 3 года назад

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

@alejandromartinezarrieta8871 8 лет назад

You are a freaking genius. Thanks so much

@ziaulhassan8171 5 лет назад

Excellent lecture thank you

@lsdka24 10 лет назад

Good Job!!!

@clearskyy 6 лет назад

awesome, just what I was looking for

@codyd.18 6 лет назад

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.

@elmaancy 10 лет назад

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 ?

@movingupautodiagnostics8645 8 лет назад

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

@EngineeringExplained 11 лет назад

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 4 года назад

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!" 👍

@traintour3763 2 года назад

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

@GalaXy808 8 лет назад

I really like explanation wow!

@jaimieconroy36 3 года назад

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?

@richardgordon8707 5 лет назад

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 !

@EngineeringExplained 11 лет назад

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

@wongbryson 11 лет назад

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

@EngineeringExplained 11 лет назад

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

@beetlesuzuki72 10 лет назад

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.

@littlerobbo8185 8 лет назад

excellent explanation

@saracen7774 7 лет назад

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

@fc3sking119 7 лет назад

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

@jada7493 7 лет назад

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)

@HuaRenHoooo 6 лет назад

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..

@Reapr98 2 года назад

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

@mickblock 11 лет назад

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!

@SnoboardAssassin 9 лет назад

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 9 лет назад

Hunter Fenn Nice! Glad you find it helpful!

@muscleshawty1995 9 лет назад

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

@tonyliu9982 7 лет назад

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 4 года назад

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.

@mohitgarg802 4 года назад

Simply Explained. Thanks

@garydenny7904 Год назад

Brilliant teaching as always

@fioswild 6 лет назад

Really cool!

@angelwolf2358 3 года назад

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

@perezrudy2011 Год назад

Thank you for this video!

@beachbum0014 11 лет назад

Nice job, buddy

@Lendog19v2 5 лет назад

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?

@juicedd9646 7 лет назад

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 11 лет назад

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.

@Pali4life2 11 лет назад

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!

@TheELiTeintruder 11 лет назад

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,,,,,

@Penafort 11 лет назад

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

@spartangodzz28 11 лет назад

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

@ranjithshreyas Год назад

Well explained.

@fuzzybrowd 9 лет назад

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

@dhasuvdd 4 года назад

Useful info

@adamlisowskiselby680 9 лет назад

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

@schammo8893 3 года назад

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?

@beinspired142 9 лет назад

in MAP-operated economizer that MAP is stands is manifold absolute pressure? or different ?

@Hajjat 11 лет назад

Interesting stuff, I love your vids! So I was just reading an article about ECU and it seems that ECU will inject fixed quantity of fuel into the engine. Wouldn't that mess up the air-to-fuel ratio you talk about here? I'm confused :\

@osvandremolinari 7 лет назад

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

@tqaquotes9379 2 года назад

Quick & Clear & Relevant & Good information. Thanks

@beinspired142 9 лет назад

hi can you explain what is piston-type economizer?

@jamestaylor1274 7 лет назад

good and clear not confussing

@PranavHosangadi 11 лет назад

NC State!!! Gonna go there too!! :D

@sahanahohara4690 4 года назад

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

@Carrera911Fan 11 лет назад

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

@EngineeringExplained 10 лет назад

It may just be running rich to warm up. Also, when it's cold your catalytic converter won't be running very efficiently until it has warmed up, so you'll smell the gas.

@samuelhurtado7968 9 лет назад

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.

@wilkerdias8180 3 месяца назад

Nice, thanks!

@MrAsianmusiclover 4 года назад

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

@EngineeringExplained 11 лет назад

I'm not sure, I would assume it'd be strong enough, but don't know. An additional 12 psi creates a large power difference, but really isn't that large of a pressure difference.