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.
Brother I just typed map sensor into RUclips and you popped up and delivered an absolutely on point and excellent presentation thank you sincerely sir.
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!
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.
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.
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.
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!
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!
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
@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.
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!
Back in the day I had a manifold pressure dial on the dashboard. It was a great visual aid to drive economically, as you could instantly see exactly where that tiny extra press on the gas pedal would translate to a significant increase in the manifold pressure - and fuel flow. By watching te indicator, it was possible to negotiate a gas pedal position that would result in not increasing the manifold pressure, and at the same time maintain current speed (though with practice I learned to "feel" that precise point, without having to look at the gauge). In the modern cars of today we have the instantaneous mileage indication, which can be used to the same effect (drive economically).
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.
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.
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 🤔
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,,,,,
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.
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.
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.
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
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.
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.
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.
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!" 👍
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 !
Not necessarily. Just because you live in a colder area doesn't mean your car makes more power; in fact many times it can mean the opposite. Higher elevation areas will have less oxygen in the air, and thus the cars will produce less power. If you have the combination of high oxygen content air, in a cool area, then yes, there could be power benefits.
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
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.
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.
See in a normal situation with a low amount of throttle applied, the throttle-valve is almost closed. Thus preventing the engine form breathing at it's full capacity. Still the pistons go up and down sucking air into the cilinders. But the closed throttle is like an obstacle creating a vacuum in the intake manifold. Or at least a lower pressure then atmospheric. Only at full throttle this resistance drops and maniflold pressure is atmospheric. SO more airflow increases manifold pressure.
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 !
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.
II see that this is video is from quite a while ago. I have a MAP senor on the intake of my carbureted motorcycle. I assume, in my case, that the sensor only impacts the ignition timing. Can you do a similar explanation for a carbureted engine with a MAP sensor? I liked your presentation.
Hi man just a quick question . What's the difference between an absolute back pressure sensor vs relative back pressure sensor? Like would the absolute result in a lower value sent to the ecu than if a relative was used?
I have a 2.5L Sebring with a MAP sensor. It's not turbo charged, but when I had it hard on the throttle I would randomly lose power for a second and it would go back onto it. I replaced my MAP sensor and it was all fixed.
Hi Engineering Explained, my car is on Stage 2 and recently upgraded the turbo compressor wheels, and wastegate actuator. Should I upgrade my 2.5 Bar Map sensor to 3 Bar sensor? Thanks in advance
I'm not sure what the failure mode is when a MAP fails. I wouldn't assume it to be the problem for a motor that won't. If fuel is the problem I'd look at the injectors, fuel pump, and fuel hose lines first.
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)
nice video..i learned alot from it..question...i have a Honda civic, i realize each time i drive and come to a complete stop..the rev falls below 1 and the car shuts off..what is the cause of this?
BTW the output of MAP sensors is voltage ( usually 0-5V range ) in most cases or variable frequency on some Ford automobiles. Conversion resistance -voltage / frequency happens inside the MAP sensor , not in the ECU!
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
What do you mean by "power cycles" when you're talking about engine speed? Also, do car engineers engineer both a MAF and a MAP sensor for an engine or is it typically one or the other?
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?
Well typically, yes, cold air will mean more oxygen. But it should be noted that a cold engine will not be as efficient as a warm engine - not as good of lubrication, more friction. But yeah, night driving you'll have "more powerful" cars than day driving, I use quotes because you won't notice the difference.
Yes and No. The ECU constantly trims the fuel maps for partial throttle. This means you can install an intake and the ECU can sense additional air and richen the fuel mixture. The fuel trims do not affect the high load tables. When you apply enough load on the engine it will go into open loop and read only the pre programmed mapping. This means your engine will run leaner at wide open throttle when your intake is installed. Fuel must be added back in by modifying the high load tables.
Im currently in some trouble with my fuel injected Honda VFR 800FI motorcycle. The problem seems to occur when the temperature increases. Means: the hotter it gets, the more hesitation i get on the trottle. I will give it a try and change the temperature sensor first because thanks to this video i think i´ve understood the principle of fuel injection. I´ll let you know what the result was for you guys that are interested. cheers
Hi, my (car BMW e46) has both a MAF and MAP sensor. Does this mean the MAP sensor is completely redundant until the MAF fails? Or does it work in tandem with the MAF at all times adjusting for air pressure inside the engine? Thanks for any help 🙂
Thanks man - great video ! I did a bit of experimentation the other day trying to diagnose a certain issue with my car. What I noticed was, the map sensor would give a certain value at idle, this value would increase as I'd step on it - but - as soon as the new / high RPM is stabilized - the map sensor signal value would default back to as it was on the idle. To rule out it was a sensor issue, I unplugged the pipe from the intake/manifold & created a vaccuum through mouth & the signal value would maintain instead of defaulting back. TLDR : it appears that the pressure in the engine would drop back after acceleration - which would naturally cause the map to lower down its signal - do you know if this is how its meant to be ? or am I experiencing some undesirable vacuum leakage (other details : toyota 5afe, knocking, occasional puffing in the silencer, possible tappet noise, possible rich burn)
![Diggy Graves - Red Vineyard [Official Lyric Video]](http://i.ytimg.com/vi/8Ro085T0mnQ/mqdefault.jpg)
Everytime I google something to learn about my car, an Engineering Explained video comes up. Love this guy.
+atothezeezee Thanks! :)
Clear explanations, to the point and free of clutter! Great video! Thanks
Great vid. Has he got a modified faster car though?
Just as I'm about to click on another video, I see Engineering Explained and I come here first!
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.
Thank you! Glad you enjoy the content!
Brother I just typed map sensor into RUclips and you popped up and delivered an absolutely on point and excellent presentation thank you sincerely sir.
Finally someone explains how it works in a way I can understand. THANK you
Very welcome, thanks for watching!
+Engineering Explained wondering do u know code P2187 is that might Map sensor？
Yessss thanks god
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!
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.
you just made my exam revision breakdown from one day to one hour awesome stuff thanks
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.
Thanks, glad you enjoy them!
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.
Think you for your fantastic and easy to understand explanations of all this car automative electronic stuff.
Great job!!
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!
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!
All the videos are absolutely amazing ! Helped me a lot in the exam preparations
Happy to hear it, thanks for watching!
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!
Hunter Fenn Nice! Glad you find it helpful!
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
@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.
Nice explanation! It would be nice to talk about the pros and against between MAF and MAP.
Man that B series brings back some memories!
It may be an old vid but its still relevant and useful information. Thanks for leaving it up.
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!
Quick & Clear & Relevant & Good information.
Thanks
Hey man, you're videos are great. I'm applying to college and hoping to be a mechanical engineer.
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!
this must be one of his earlier vids still really good!!
Back in the day I had a manifold pressure dial on the dashboard. It was a great visual aid to drive economically, as you could instantly see exactly where that tiny extra press on the gas pedal would translate to a significant increase in the manifold pressure - and fuel flow. By watching te indicator, it was possible to negotiate a gas pedal position that would result in not increasing the manifold pressure, and at the same time maintain current speed (though with practice I learned to "feel" that precise point, without having to look at the gauge). In the modern cars of today we have the instantaneous mileage indication, which can be used to the same effect (drive economically).
You’re awesome man! Every time I have a question about one of my vehicles I can always find an answer here. Thank you!
Brilliant teaching as always
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.
Thanks so much teacher I'm just a kid and I can understand your explanation,its so easy.thanks alot ,
Engineering explained
Great explaination as usual Jason, I understand MAPs perfectly now. Thanks Jason and keep on making awesome helpful videos man. 👍👍👍
The ecu doesn't change the signal into a voltage, the sensor itself does that. Great video by the way :)
As someone who subbed only about three or four years ago, seeing you this young is seriously odd xD excellent explanation though as usual!
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.
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 🤔
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,,,,,
Not sure, I'd try googling your problem and seeing what comes up in VW forums.
i know ive said this maybe a couple of times but is that clutch video on its way :)
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.
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.
Thank your informative video. I know a good bit, but this helps tie things together easier
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.
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
@@phatvu3811 Thanks, that makes a lot of sense! :-)
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.
Hello
So if a motor uses the MAP sensor will not have the MAF sensor?
Your videos are great.
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).
11 year old video still helping someone out.
Good job. I love watching your videos.
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.
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.
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!"
👍
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 !
excellent explanation
Great videos for ASE A1, A8, L1...
Proper video. Good explainanation my friend 👍
Not necessarily. Just because you live in a colder area doesn't mean your car makes more power; in fact many times it can mean the opposite. Higher elevation areas will have less oxygen in the air, and thus the cars will produce less power. If you have the combination of high oxygen content air, in a cool area, then yes, there could be power benefits.
Best of luck!
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
Thanks! ECU's typically will control the amount of fuel injected, this is not a fixed amount.
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.
I'm not either, basically a material property where the resistance changes when the chip is stretched.
Simply Explained. Thanks
What you pointed out was actually your throttle position sensor.
Where did you go for mechanical engineering?
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.
Great channel man. Plz some day explain the limited slip differential :-)
See in a normal situation with a low amount of throttle applied, the throttle-valve is almost closed. Thus preventing the engine form breathing at it's full capacity. Still the pistons go up and down sucking air into the cilinders. But the closed throttle is like an obstacle creating a vacuum in the intake manifold. Or at least a lower pressure then atmospheric. Only at full throttle this resistance drops and maniflold pressure is atmospheric. SO more airflow increases manifold pressure.
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 !
Hey Jason, which system do you think is more reliable? Speed density or air density?
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.
II see that this is video is from quite a while ago. I have a MAP senor on the intake of my carbureted motorcycle. I assume, in my case, that the sensor only impacts the ignition timing. Can you do a similar explanation for a carbureted engine with a MAP sensor? I liked your presentation.
With absolute pressure do you define 0 as a perfect vacuum? good video btw
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
Could you tell me what's the purpose of MAP sensor in MAF engine???
Hi, Is Manifold Absolute Pressure same thing as Intake Manifold Pressure?
Yes.
Thank you for this video!
good and clear not confussing
Hi man just a quick question . What's the difference between an absolute back pressure sensor vs relative back pressure sensor? Like would the absolute result in a lower value sent to the ecu than if a relative was used?
thank you for the explnation... new subscriber here...
I have a 2.5L Sebring with a MAP sensor. It's not turbo charged, but when I had it hard on the throttle I would randomly lose power for a second and it would go back onto it. I replaced my MAP sensor and it was all fixed.
Hi Engineering Explained, my car is on Stage 2 and recently upgraded the turbo compressor wheels, and wastegate actuator. Should I upgrade my 2.5 Bar Map sensor to 3 Bar sensor? Thanks in advance
I'm not sure what the failure mode is when a MAP fails. I wouldn't assume it to be the problem for a motor that won't. If fuel is the problem I'd look at the injectors, fuel pump, and fuel hose lines first.
You are welcome!
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)
You should also do a Maf sensor and how to understand it with the scanner?
nice video..i learned alot from it..question...i have a Honda civic, i realize each time i drive and come to a complete stop..the rev falls below 1 and the car shuts off..what is the cause of this?
It's a property of the chip, I'm not sure why. Perhaps a longer path, or friction causes a small temperature change.
BTW the output of MAP sensors is voltage ( usually 0-5V range ) in most cases or variable frequency on some Ford automobiles. Conversion resistance -voltage / frequency happens inside the MAP sensor , not in the ECU!
Awesome, good luck to you!
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
Great video, well explained.
What do you mean by "power cycles" when you're talking about engine speed? Also, do car engineers engineer both a MAF and a MAP sensor for an engine or is it typically one or the other?
They are close to each other, yes.
Hey quick question can't i read boost pressure in a speed density setting?
Well explained.
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?
what symptoms might u experience if your map sensor fails? poor acceleration? rough idle?
thanks
adam
You are a freaking genius. Thanks so much
Well typically, yes, cold air will mean more oxygen. But it should be noted that a cold engine will not be as efficient as a warm engine - not as good of lubrication, more friction. But yeah, night driving you'll have "more powerful" cars than day driving, I use quotes because you won't notice the difference.
Excellent lecture thank you
Yes and No. The ECU constantly trims the fuel maps for partial throttle. This means you can install an intake and the ECU can sense additional air and richen the fuel mixture.
The fuel trims do not affect the high load tables. When you apply enough load on the engine it will go into open loop and read only the pre programmed mapping. This means your engine will run leaner at wide open throttle when your intake is installed. Fuel must be added back in by modifying the high load tables.
Im currently in some trouble with my fuel injected Honda VFR 800FI motorcycle. The problem seems to occur when the temperature increases. Means: the hotter it gets, the more hesitation i get on the trottle.
I will give it a try and change the temperature sensor first because thanks to this video i think i´ve understood the principle of fuel injection. I´ll let you know what the result was for you guys that are interested.
cheers
awesome, just what I was looking for
Nice job, buddy
Great explanation, It really helped. Thanks!
Hi, my (car BMW e46) has both a MAF and MAP sensor. Does this mean the MAP sensor is completely redundant until the MAF fails? Or does it work in tandem with the MAF at all times adjusting for air pressure inside the engine? Thanks for any help 🙂
Thanks man - great video !
I did a bit of experimentation the other day trying to diagnose a certain issue with my car. What I noticed was, the map sensor would give a certain value at idle, this value would increase as I'd step on it - but - as soon as the new / high RPM is stabilized - the map sensor signal value would default back to as it was on the idle.
To rule out it was a sensor issue, I unplugged the pipe from the intake/manifold & created a vaccuum through mouth & the signal value would maintain instead of defaulting back.
TLDR : it appears that the pressure in the engine would drop back after acceleration - which would naturally cause the map to lower down its signal - do you know if this is how its meant to be ? or am I experiencing some undesirable vacuum leakage (other details : toyota 5afe, knocking, occasional puffing in the silencer, possible tappet noise, possible rich burn)