MAP Sensor Diagnosis and Understanding Function- Pt2
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- เผยแพร่เมื่อ 7 ก.ย. 2024
- In Part 2 we cover scan tool testing of MAP sensor and create variables to better understand expected MAP function given certain conditions to help diagnose problems like vacuum leaks or engine idle problems.
Part 1 is here: • MAP Sensor Diagnosis a...
Hello everyone. My name is Gary and I'm a parts changer. But thanks to these vids, I'm in recovery.
Hahahahaha One of best comments ever!!! Yes I admit, I used to be a parts changer too. Before I started doing these videos I actually used to take my car to the dealer to get diagnosed and then change the part myself lol.
Hahah! Brilliant comment. A mis-use of the word maybe, but still, I'll stand by it :)
geecrawdad Hello Gary!
That literally made me LOL
You and me both. I think I'm still withdrawing. lmao
Never seen complex processes explained so lucidly and clearly. It's like attending a classroom lecture. Thank you for such a wonderful presentation.
I must admit I struggled with these concepts a little at first. I've had to watch the videos a few times to get to grips with them. However, it's very rewarding when the light finally comes on - I'm now able to interpret MAP sensor data in various scenarios, and also to tie-in data from other inputs. Once you see the MAP sensor as a holistic entity, it starts to become clear. This guy is a genius; it's such a rare gift to be able to enlighten an entire audience when all else before has failed them. We are part of an auto alumni who owe our education to Schrodinger's Box.
Thanks as always my friend. Yeah it often takes me as many as 5 or 6 times to learn a concept but as you said, once it “clicks” you know it for life. also, often the basic concepts allow you to learn more complex ones easier. Once you master basic electrical- pretty much learning any electrical component or system takes way less effort.
The book that created the truck engine castings for each piece thought up first. vs Firestone Auto complete kids working there on marijuana.
Hi Matt I been a mechanic for the last 41 years. I been watching your videos for the last 2 hours. I learned more in the last 2 hours than i did in 41 years. THANKS please keep it up your great man. Dont pay attention to the negative comments they dont want to learn anything they already know it all. THANKS AGAIN
Dang, thanks man. what a huge compliment!! Much appreciated!
wow thats says something right there hes good
Thank God after 25 years I finally know what it does.
Sadly there are not many good teachers like Matt in all area's and esp at different time periods through our impoverished lives , and most people are not particularly bothered regarding their trade level skills,just good enough to make as much money in as quick a time as possible, 'Mediocrity' is their invisible Nemesis, and if pointed out they switch far quicker than lightning to defend their ego,shocking state of the decaying nature of once proud and resilient pioneers who led the world in all things.🤔
Greetings from Australia. Been a mechanic for 60 yrs, ex race cars & F1 & was well trained on & understood all fuel injection to 1980. Been working hot rods & 60"s muscle cars since 2000 & long stint as service manager before that. Had to repair some OBD1 a couple of times since being on my own from 2000 but even factory manuals I had didn't really explain function & figures in any great detail & trying to diag my daughter's 2011 Hyundai prompted me to buy an Xtool D8 scanner, but not understand what I was reading & so found your site clearly by divine providence. AWESOME tutorials & easy to grasp, the clear sign of someone who REALLY understands what they're on about & a pleasure to watch. Now have a good grasp, after spending sleepless nights watching many of your tutorials, of how it all works, thanks to your diligence & perseverance. Thank you very much for your efforts, I am indebted to you. Over the years of having people blame carbs, electronic ign. & now fuel injection, for everything that goes wrong, have found it best to start from first principles & have fixed heaps of badly running cars, early Jaguar with 0.004"" intake & 0.006" exhaust valve lash in particular, by starting all tune ups with valve clearance check/adjustment, plug check (& very often fit correct plugs instead of the new wrong ones) & on to the distributor & then look at fueling. Have also fixed countless cars poor performance after curing voltage/ earthing issues. Takes a few seconds to check relevant voltages on pre efi cars. That way you know the foundations are ok before replacing the roof. Repaired a 1969 V8 Aston Martin that had retarded cam timing, one tooth out, & the 3 quadrant pointers each tied in a knot (a real work of art & also to untie them) that had been to every place I contacted for help (waste of time) over a 21/2 yr period. They all blamed the Bosch mechanical fuel injection. Told the owner to take it for a run & if he wasn't happy, to keep going but come back & pay if he was. The bill was massive & he couldn't pay fast enough. Apart from race cars, was one of the fastest cars I had driven until a Ferrari 365 GTB/4 (Daytona to you guys) in 1972. A client bought a used car with 35,000mls but 10 yrs old & called by to show me how nice it was.I suggested he change the cam belt immediately but he had a few errands to run & booked it for the next day. 15mins later he rang to say it had stopped running. The cam belt broke & destroyed the interference engine. Now I won't work on an engine before being certain the cam belt is within the service period or I have changed it. My observations after 60 yrs in the business. Once again THANK YOU
Wow thank you for the wonderful comment!! Cool story!!
This is unquestionably the best video of its kind; nowhere else on the internet will you find a more comprehensive tutorial on how a MAP sensor works. When studied in conjunction with SB's other 'engine sensor' videos, this session provides you with a complete understanding of how a modern engine 'thinks'. For anyone who's mastered SB's fuel trims tutorial, the possibilities are endless. You'll be able to diagnose a plethera of engine issues... like a boss!
Thanks as always my friend!!
@@SchrodingersBox You are most welcome as always.
i am a mechanic of 30 years experience and have now owned and operated my own business for 15 years and i came across your site through a client and well done its about time someone put something meaningful on for your average person to learn and understand that testing these parts takes time and expertise and its not just take a punt at it like most dickheads on the internet i just had my apprentice watch one of your videos so he could learn something properly instead of listening to his stupid mates and not me so again well done keep it up
Crusty Chris Lol- yeah not being from the industry I am shocked at discovering how clearly rampant "swaptronics" really is. It is refreshing to see a small percentage of people willing to learn diagnostics but it is a really, really small percentage. Most people just don't see the value in it- they are simply not programmed to think that way. Amazing, eh?
+Schrodingers Box Thanks for the video, and you're right. Automotive training should involve half of the education and training at least in diagnostics. In health care, no provider is allowed to jump around on drugs or surgeries to fix a problem, they diagnose it first.
Yes several people mentioned the medical analogy and I have always thought the same way. It absolutely holds true if you imagine a surgeon with a "parts changer" approach!!!! Ewwwwww lol! But diagnostics is diagnostics- whether medicine, automotive, HVAC, plumbing, or whatever. The tools and procedures are different, but the logical thought process is absolutely 100% identical in all cases.
Crusty Chris so what would you say if the map sensor is testing good with a vacuum pump, but is then reading opposite of expected when the vehicle is running. 98 grand Cherokee sits around 1.5v but goes to .5v or so when I increase rpm.
@@SchrodingersBox my nephew is a Brain Surgeon he told my niece that some Ortho docs have screwed some nerves up trying to fix someone. He said to her I wish that patient had come to me first. Old blog here but all fields have their hack asses.
Please don't ever stop making these videos. They are absolutely invaluable to those of us who truly strive to understand the "why". Thank you for your insights and your contributions.
Thank you, I will
Thank you for wonderful tutorial. The best I have come across about the MAP sensors.
I just came across this wonderful MASTER MECHANICS, It is great to know there are people out there really teaching how to fish, rather than handing out the fish. Keeping up the faith in humanity! Greetingsfrom Caracas Venezuela.
Two of the very Best tutorials on this confusing topic, Thank you for this upload Matt, please do continue with all the great work, i went to an unknown destination some time ago to get some parts,and had to consult a different 'MAP' to get my bearings together!! 🙂
Understood the concept halfway into the 1st video. As a lazy person tho, I bought both the upstream sensors and the MAP. Turned out the O2 sensor got rid of the code so I refunded the other part. lol. I guess no troubleshooting needed if you understand it but lazy as hell..thank you sir for the money and time you saved me.
I JUST LOVE THE LINE HE DRAW'S WHEN IT COMES TO WORK PRACTICE.......IT SEPARATES THE SHADE TREE AND THE PROFESSIONAL!!!
Thank you for the vid....
I went to Nashville Auto Diesel College and in 35 minutes I will say your video is better explained and more informative, thank you!
Prolly cuz you didn't pay attention and apply yourself. I went there too. Learned everything this man has just said.only difference...his is free
Very in-depth about the MAP sensor.. I was about to replace mine - thanks for the info, and keep it up!
I’m glad someone like you took the time to read service manuals and take the best points and condense info into a series so people like me who don’t have the time to do all that can click onto your videos and learn so much so fast. You rock
Just want to say, your breakdowns on these topics are superb.. Best on youtube. And I agree, LTFT is the most important reading to have to help diagnose many issues!
This is the best channel for learning car systems I have seen. Please pay no attention to the wise guys who think they know it all. I am a retired electronic technician and many things that seem obvious are not always the problem. Thanks
Thank you!!
best teaching video i've ever found.
+Jacob Delano Thanks!! You will probably like my video "secret of engine problem diagnosis: fuel trims". I think it's better than this one.
+Schrodingers Box Do the map have the same volt as the maf
yes 5 volts base voltage from PCM or ignition, TPS and other sensors and etc do also.
Wow! Teaching example
What you stated from 11:35 - 12:45 is absolute gold nuggets. No technician should be allowed to diagnose and repair drivability and fault code diagnosis that doesn't understand what Matt shared. This explanation could practically apply to most any code. Learning system integration between inputs and outputs is absolutely essential to be a 2%'er. This channel is not as recognized as some but I would put Matt up against any other tech from any other channel when it comes to complete and accurate diagnostics.
Thank you so much!! I will admit it may take me longer than other techs but I would get there eventually with a correct diagnosis the first time- just slower than some.
Having an OBD-II vehicle and being able to see all that sensor data greatly reduces the learning curve required to learn automotive repair. Your videos on teaching what every component does greatly reduces that learning curve even more. I would love to see you cover every single component that has scan data available one by one until you cover them all. I think that would be invaluable for anyone that wants to really learn diagnostics. Your channel is just superb and getting better with every single video. The cumulative knowledge on your channel will eventually become a mecca for the advanced enthusiast.
***** Consider it done- others have mentioned similar and in fact, it is absolutely necessary I do this if I am to "complete" the philosophy of the channel. It would allow me to focus more on the diagnosis and less on the explanation in future videos because the explanations could be referenced in the diagnosis videos for those who need them. For those who don't need the explanations and background it would improve the flow of a diagnostic video. Yes, consider it done- thanks for the feedback.
I forgot to mention that youtube creators that have accumulated many videos like ETCG, BriansMobile, JAFRO, and even Kilmer, all reference their past videos for the sake of saving time. I do it regularly with embedding links in annotations. As long as they are unobtrusive I don't have a problem with them. I find myself turning annotations off for videos that I know the author likes to make large text that says something like "CLICK HERE TO SUBSCRIBE NOW." and the annotation stays on the screen for almost 30 seconds. To me that's equivalent to spam and detracts from the video. For guys like JAFRO that pile a lot of commentary in I never turn annotations off, sometimes a note in an annotation could be the difference between a successful and unsuccessful project. It's always those last minute "doh I forgot to add this or that". Annotations are great for that purpose... I mean that's kind of the definition of the word. :)
***** You nailed it bro! That's exactly the plan!
BTW Devon, for over a year I have been trying to think of a term for the intended demographic of the channel and you absolutely nailed it in your comment- "advanced enthusiast". That is the term I will be using herein.
Great teaching Matt, my car has a speed density engine and this video has great info for me.
I like that saying "Tools don't fix cars...brains do!".
All your vids are awesome. Even this 8year old one lol.
The 05 Tacoma's still runs when the MAP sensor is disconnected, MAF sensor unplugged, O2 sensors unplugged, AND Camshaft sensor is disconnected. At 2k RPM max. The limp mode is mind blowing but remembered watching a military engineering show on some engine a while back. It mentioned its computer's ability to use data from other functional sensors to estimate the air/fuel ratio and continue running. On the Tacoma, the Crankshafts sensor was still plugged in (no power to fuel pump when Crankshaft sensor is disconnected). Logically thinking, in its stock form it can estimate air/fuel ratio relying on the Crankshaft sensor and the TPS.
And don't mind them "ASS HAT'S". Their "CHECK BRAIN" light is on lol.
1) great stuff - thank you!
2) on your comment that a misfire will effect the map sensor values - you may be surprised that it doesn't work as much as one would intuitively expect. The reason is that the engine is still pumping air through a misfiring (lets just call it a dead cylinder) so the air volume is actually remaining the same as if the cylinder were firing. At idle, the map sensor can pick up the lower idle speed that is a result of the dead cylinder, but if the idle speed is raised the engine vacuum will be restored. This is a difficult concept to grasp when working with multi-cylinder engines with common intake plenums, but it's clearly evident when moving to say motorcycles, that use separate throttle bodies for each cylinder. Hook up a set of sync guages to check each cylinders vacuum, kill the cylinder, and note that the vacuum only changes to the dead cylinder because of the rpm loss from less air volume being pumped.
Found this channel because of an erratic idle of my Accord. My first hunch was the MAP and now in a way to diagnose mine. Subbed.
492 comments, I'm sure someone mentioned this... @ 10:20 ish you're describing a rich condition that you tricked the engine into but wrote down a lean 14.7:3 condition ratio.
You are a GREAT teacher. Thank you for your time/energy.
This was awesome thank you iam big believer in knowing how these components work ,makes trouble shooting a lot easier .
If someone is patient and sticks through both videos they will walk away with a wealth of understanding.
Broken wires or bad grounds are common. I have a new maf sensor I've got voltage, but I'm not reading anything between the ground and signal wire when it is running.
Thanks, very informative.
Ok apologies I used my brain I have a bad oring on an injector. Replacing all of them since I am at 400,000 mi.
Awesome knowledge sir really appreciate the lack of dimwittery and claims of knowledge backed up by?
Excellent vid sir gonna watch all yer vids man! Thank you Mad Respect and much love!
Excellent video and EXCELLENT explanations of how things work. You can look for online info for so many things and just waste so much time finding meatheads that make crappy video's and don't know what their talking about, never mind be able to explain in depth like you did. I'm 53 and been a long time mechanic on my own diesel and gas trucks and equipment all my life. I haven't brought anything of mine to a shop since a teenager. I mostly have, save, and run the 80's square body gm trucks with carbs and have a yard full of parts trucks. I'm a master with any carb, but have procrastinated on FI over the years. I have been forced into it slowly over the years of course with my ole ladies cars, etc. Thank you, this is what I've been looking for. I'm going to your fuel trims vid now.
Impresionado por tan clara información y sobretodo con los ejemplos que pone.
Ing muchas felicidades y siga ilustrando nos con tan valiosos conocimientos.
Saludos desde CDMX
Thank you, like you I was always taught that a sensor is to do something and that is communicate something right or wrong. Therefore check for what is wrong. That's why a sensor should always be the last thing not the first thing you suspect. Understanding, experience and diagnosis is a skill . You have bags of it and thanks for sharing.
Currently chasing a higher than usual LTFT in my turbo MAP only engine , I suspected this sensor not properly functioning for no good reason now I can intelligently test and diagnose if this sensor is good or bad . Your explanation was fantastic and easy to understand , took many notes during your video , like so many others have said " Thanks So Much !"
excellent. I have actually only once ever seen a bad map sensor. Only once.
Hi my name is Juan, l want to thank you Matt for doing this kind of videos, in my opinion you found the perfect way to teach automitive mechanic, because you teach how to find and fix the problem perfectly explained and perfectly accurate. Im sorry if l have some misspelling but English is my secon lenguage and l didn't have the oportunity to study it here in USA, but l want you to know im very thankful for sharing your knowledge with so many people including me, because thanks to that l dont even save so mucho money fixing my own vehicles but my friends's too and now lm confident enogh to buy broken cars to fix them and sell em.
A MILLION THAKS FOR YOUR TEACHINGS SIR GOD BLESS YOU WITH MORE KNOWLEDGE.🙏
Thank you for the feedback! I am very happy to hear this!!!
Matt, Thank you for all that you do to make your videos. Let alone the precise instructions you give. Absolutely the most effective and efficient teaching/learning experience I have found for automotive diagnostics. I am without the words. Just “THANK YOU!!!”
My pleasure my friend
Man!!! Thank you so much! Working on a 2003 Mitsubishi Galant 2.4 with a P0107 code. This video taught me so much about the MAP sensor and how it’s codes can tell you what is ACTUALLY wrong!
Great tutorial. In the absence of an explanation for in my case a Mini R56, n12 engine. It carries no MAF sensor. I see now how it’s trimmed by the MAP sensor. Like your diagnosis of the other linked sensors and possibly scenarios too of coding or voltage errors. Thanks and now subscribed.
Thank you for the lesson. I had an inkling that my map sensor code wasn’t actually a map sensor failure but wasn’t 100% sure without understanding the mechanics of it
A well known phrase is that;- if you know a subject well, then you can describe it well.
Well done good teacher.
If anything wasn't quite right, or missed out, too bad, we have all learnt heaps.
Now this, my friends, is a mechanic
Man, this guy is amazing! I'm a physician and this reminds me of pulmanology and learning about Co2 and O2. I will watch everyone of your videos Sir! Thank you!
Welcome aboard! I spent 13 years in pulmonary and critical care medical research specializing in cystic fibrosis and primary. pulmonary hypertension
My Salute for YOU SIR.
LOVE FROM SAUDIARABIA.
YOU ARE JUST 👏
I know this is a bit old but have to say more people need to see this .
This guy teaches and explains in plain English & it's absurd that there aren't a million views or subscribers. BRAVO!!!
Thanks man! the truth is - most people by far just want to see someone spinning wrenches because they can always say “I can do that....better!”. Very few people will spend time actually watching something that requires study and attention.
Hats off to you, Mr.
You're a good teacher.
thank you!!
I agree with Jacob Delano. Very well explained and depicted on how the interplay of components affect the computer and the ramifications on out of spec parts and what that data tells us and the computer is going on.
thank you matt, very well explain video as always, you are my mentor
I respect a man that knows how to share his knowledge to a high standard like this, thanks man, you really helped me out, sub and like
Yep, crystal clear, checking voltage level reponse in conjunction with a diagnostic signal trace would confirm or eliminate any MAP sensor percieved faults.
This video is so much helpful still in year 2022. Thanks for the great tutorial!
Thanks for all this. Your like the Alton Brown of cars. Im by no means a mechanic but rather love the science of car mechanics and I can now diagnose the MAP issues Im having and understand it completely.
Man I really want to thank you so much for your videos! They are really useful, your videos along with the ones from Paul Danner are the best on this network. GOD bless you guys
Very nice and helpful video
I'm learning a lot from you and your videos
Studing now Vehicle Practical Engineer here in Israel and with your explainations everything is much clearer
Thanks
Whats with all this great knowledge?....i wanna use my scan tool at 1130 at night..just 4 the hell of it...lol...hands down tje best channel on youtube...i feel like im in a class that i wanna be in....thx...please dont stop making these
You are a good teacher & one of the best I'd ever seen. You have a talent to teach & a skill to explain it that even an idiot like me can most understand. Thanks
I just changed the MAP sensor on my elantra 2003, and the car still hesitates to accelerate when cold. I wish I saw this video first to start analyze what could be the root cause, and not just spend money on something that won't fix the issue.
Thanks for your time to do this video, it was really helpful to understand that a code won't really tell where the problem is.
You’re great tech master 😊, i m so lucky for having found you , thank you very much!! Helio
Time came today to test my MAP sensor. Videos were very helpful.
I narrowed my MAP test results down to either a bad MAP sensor or a real bad vacuum leak. Autoenginuity gave me 4.49 volts reference to the MAP with ignition on and engine off - I am 200 feet above sea level. Also gave me volts ranging from 1.30 volts at 600 rpm idle and .93 volts at 2,450 rpm. The most interesting revelation is that Autoenginuity gave me in.hg pressure that ranged from a whopping 19.5 at idle to 23.07 at 2,450 rpm.
Short term fuel trims and long term fuel trims are 0 at idle and raise to 5-10 points at 2,200 rpm on both banks.
My next steps - check for a major vacuum leak, check fuel pressure at the fuel rail. If no vacuum leak, replace the MAP sensor.
Scary thought is that a bad MAP sensor could be generating 0 fuel trim readings at idle. Whoa. Could be that I have a bad MAP sensor and also have a fuel pressure delivery problem. Ignorance is bliss.
Great teaching technique, Matt! I really enjoy your question/answer, give us a minute, and then explain the correct answer method. As you always say, having a good understanding of how and why these systems work as they do, is a big advantage when it comes to repairing them! Otherwise, we're just "random-parts swappers"! :-) Keep up the good work!
Really awesome video my man!
I got my first Check Engine light today and it read as a IAT problem, itself being an integral part of the MAP sensor. After watching this video I'll test it out before replacing, and thank you so much for the run down of what the MAP does.
You've got yourself another subscriber here!
These videos are awesome. It is nice to understand how things work and not just be a "parts changer". I am excited to get a chance to put it to use. I appreciate you taking your time to share your knowledge.
***** Appreciate your time letting me know they help! 98% of people would not "waste their time" on learning this stuff, so you can rest assured you will be quite elite in your ability to diagnose things!!! It is a skill that will be highly sought after by parts changers when they run our of ideas!!
I being an internet expert and know absolutely nothing on this subject thx for the 411. New to all this EFI and sensor related to it. Thx for explaining it in regular terms.
Hey ive just seen your vid and it gave me a completly new perspective on my Scooter Diagnose.
Once i wake up ill try something related to this.
Even more important, this knlowledgement stays with me for other situations. Thanks a lot
Cheers from Portugal EU
what whats knows who someone Finally
Wow, very very good at explaining the MAP sensor functions. I have a 2014 dodge avenger, and it is a map only car. Car is has a p0171 code which is a lean condition bank 1, and a p2173 vacuum leak detected. This affects the engine throttle body and the car runs rough at idle. After buying a MAP sensor which was not needed, i. Now thinking it's a IAC which would cause a vacuum leak code when idling. Which would explain the weird map reading on the freeze frame when code was determined. Which I will be testing the IAC soon before buying any parts. Thanks for your videos.
Great explanations of how the map sensor functions and integrated with other systems,very elaborate, thanks
Great info!!!! Thank you for your time and wisdom
my brother has a 1990 geo metro 1.6 and his been having problems , he is told me that the car smokes alot , and consumes lots of fuel, he said its the map sensor, but he is in costa rica , so i cant just go and help him out.. i am here in california, but i ve watched your videos . and for sure i know it makes sense that indid is the map sensor. . he ask me to go to the junk yark and locate one for him but i couldnt , i didnt find one. and i found one but is liKe 300 bucks , lol too much . so he said he will try to find one in costa rica. they are like 50 bucks use one. but anyway, thanks for your videos again. you know what you doing i love the way you explain things . very good job . keep posting more lol .. thanks. CARLOS .
thanks i lick to repeating your video because good way date you speaks it reach to the brain the way to speak is very easy easy sentences thereare no complication in their midst thanks a lot thousand of thanks
Best information and the way of teaching is vvvery doog , please do not stop to thease type of information , GOD bless you.
Your choice of words are amazing, it just tunes to my listening and processing ability correctly. Well, i am amongst those 2% 😂😅
The best automotive instructor on the Net
Thanks but Paul Danner is way better.
Schrodingers Box , he loses me most of the time. A little too technically advanced for me at this point. Anyway, you both are very admirable.
i have to see the video again. i was thinking of the map as a vacuum gauge for the computer. i was thinking of getting a reading of twentyone at idle, then you snap throttle the vacuum drops then recovering, thanks, Matt
great teaching skills I wouldn't have a better teacher
Excellent aid to everyone including car technicians!
Great video and easy to understand. Your videos are addicting for me cause I'm a "why" kind of person. When I'm told something, I always want to know why. I makes it easier for me to remember if I understand what is going on. My only problem is I'm not getting enough sleep cause I'm staying up watching your videos. lol Thanks for the easy to understand explanations.
Thanks, Matt. I've been a tech for forty years now, but I keep myself in check and part of that process is watching your videos. These are better than any seminars I have attended. It makes me sick to see these " ass hat" techs replace components based on the S.W.A.G method. Thanks man and love your sarcasm👍
Much appreciated !!!!
I'm a big fan of your videos. Thank you for taking the time to share your knowledge and experience by making them.
Thanks Mike, they are fun to make!
Thank you so much for clearing out about the map sensor and how it's related to other components as well,,,,you are a great teacher,,,, always have a nice day. Tq.
Great Series!
I sit silently watching all of your videos. Haven't found one that didn't make sense. Thanks and Keep on Rockin.
+Hawaiian F150 Thanks man. Don't be so silent next time lol!!
+Schrodingers Box Sometimes it's better to let them think your smart than it is to speak and prove that at times I'm as dim as burnt out light bulb ;)
Hawaiian F150 Hahaha yes that is true... then again if people who do have knowledge had that philosophy, we would all be in real trouble!!!
Anyway much more to come, I have some really exciting projects in the works I hope to announce soon
Kool! Can't wait - guess we'll have to.
I have learned quite a bit from you. Foremost is to look deeper into the problem with wider eyes.
Eager anticipation requires a full coffee pot.
Surely don't want to miss a thing the first time through.
Just subscribed tonight. Thanks for the videos on the MAP Sensor. Maybe I can get my money back for the new one. 🤔 Great teaching videos!
Ecxellent explanation!
Thanks for your time
Outstanding explanations Matt! Thank you sir!
Thank you!! I am going to be spending much time watching your videos. I've been trying to learn how to diagnose my car since the mech techs have been draining my wallet with little or no results. By the way your schematics are amazingly clear as long as one LISTENS. Dude you got yourself a student here. Thanks again man!!
Wow. Both parts about the MAP sensor were very understandable. Especially, the explanation how the whole system works was like: aha, now I start to understand why some error codes occur which seem not be the root cause. Keep up this kind of very good explanatory videos.
Now up to the videos about fuel trims. These videos might help me understand why I get intermittent rich fuel trim errors and find the culprit(s).
Dear Mr. Schrodingers Box,
Thank you for another very pedagogical video. After attending this class, i have few conclusions of my own, which i would like to express, for the sake of convincing myself that i understood what you've explained:
in a strictly speed density engine,
1. Lean condition can't be created by pulling the brake booster(perhaps, by disabling an inject does create lean condition, as unburned air would go past the O2 sensor)
2. injection base command pulse goes hand to hand with change in MAP
3. any mechanical misalignment of failed engine sync that leads to change in intake pressure, will induce false MAP reading and hence change the base injection, as long as the condition remains.
thanks for the class
HomemMagroide Not being fully familiar with speed density engines, I will answer best I can but your understanding is pretty much as good as mine.
1. I am not 100% sure but I would say yes that would be correct. Pulling the brake booster on a speed density engine would increase MAP signal and fuel delivery would be proportioned accordingly. However I am pretty confident that such a massive change in detected load without the TPS (Throttle Position Sensor) showing a change- that would have to be noticed by PCM and I would have to think you would get a code, but I have to think it wouldn't be a lean code since the exhaust isn't lean but man there would have to be either a TPS or MAP code I would think.
2. Correct.
3. Correct. In fact, one of the limits of a MAP engine is if you change to a high performance camshaft that has more overlap of the valves- This will definitely throw off the "sync" as you described and re-tuning would be required to compensate.
thanks for the answer. I was wondering if you've consider making a video of waste spark ignition system. This systems seems to be common to many auto maker these days.
i think its a great idea to make a library. I usually have to to my homework on theory and operation of components, as well as testing because im a weekend warrior and i dont do this for a living but love it as a hobby. So i dont have this memorized in my head how all components work, as well as how to test them. Also i think ignition system testing since there are conventional and DIS, C.O.P. would be great videos to focus on as well as the different fuel system designs, for testing. Those are the main two things that i wish i was alot more educated on and have the most trouble, troubelshooting. Keep up the good work, i'm really starting to enjoy your channel.
oops just noticed i put this quote under the wrong video, cause it automatically went to this after i watched the one called ''changing the channel''...i'm sure you will still see it thx.
The reading of STFT is negative because there is much fuel...so it needs to be corrected .
Outstanding explanation
Thank you
Another great video. Great info once again! Thanks - Glen
Ok,just the facts You are 1st A Scientist,Why did you have to be sooo Good. When you know the basics along with your research !Wow you hit it right on the nose,1st Time every time. I Appreciate and admire your dedication. You’re perfection to be honest and share your knowledge,A GIFT 💝 THAT SOME HAVE COME TO KNOW. Thank you for all you shared‘You make the world a better place for all to Learn. God Bless you and your family. Stay safe and healthy. 🥰🚘💯👀🇺🇸 14:27 14:27
Thanks so much. Glad you are enjoying the Channel and thanks so much for the comments!!
Awesome video, My S10 (4.3) had a 02 sensor code and po300, and it was the MAP! Did the quick and dirty way by just unplugging it and it was happy
Thats not how you test a MAP. It reverts to induction from MAF exclusively. You have no evidence you fixed it. replacing the MAP and in fact it's virtually impossible it caused this code.
@@SchrodingersBox One piece of evidence I have found was upon visual inspection on the sensor, it was really carboned up lol. And on slight tip of the throttle while sensor is plugged in (15-20%) the engine would be misfiring. And while I hold the throttle plate steady and then UNPLUG the sensor it would clear right on up!
That's all evidence I have right now, I don't wanna point fingers at a 21-year-old Map Sensor but idk
I really enjoy this class . auto 101 + while at home!!!!!!!
Another great vid. Thanks.
Im watching your videos as Im trying to determine what can cause hissing noise and jumping revs and hesitation on acceleration but it gets better as the engine warms up. My next checks are Map sensor and air intake manifold.
Thanks again.
I have also check coils by switching them on and off one by one. On cylinder 3 I noticed much greater engine jumping, car almost stalls. Can it be spark plug or ignition coil related??
Thanks.
excellent video,as I spent long time figure out what alternative to my non MAF engine until I found the answer here,
my engine has no MAF neither EGR.
civic 2004 ex, engine D17a1 Australian market
Thanks mate
Very helpful! Tomorrow I'll start checking other things out as well as the MAP! Thank you for your videos!
Love these videos. Already have a good understanding of automotive diagnostics and your explanations just further my knowledge.
Another great 2 parter. I'm literally going through these videos and taking notes as if I'm in a classroom. lol.
lol i have heard that a few time before ! You will find it well worth the effort i promise
If I'm honest I don't need to take any notes because the concepts really are pretty fucken simple. However, I'm watching these diagnostic videos from you in such a high volume that I'm basically putting myself through "Schrodinger's Bootcamp" lol
Lol i do try to make it so the concepts can be "integrated" rather than just be presented.
You are in the right place. take a break every few videos lol!!
Thanks for the information, now I can understand very well how a MAP sensor works.
I'm not mechanic but I like to learn new stuff and I'm very interested about it because my car have a problem and that has been very annoying for me, because at the moment no one can fix it and I have spent more than $500 and my car still have idle problem and is running very rich. I wil test the MaP sensor with a tester to see if is working well.
I've just found this channel.. Thank you so much.. The way you explain things is realy understandable. Nice one!
Glad you like them!
I wish one day I could work with you
You are the best teacher
Maybe one day!
The best video ever about MAP. I've been for several days looking for a way to understand and diagnose my car - which has got the code P0238 - and after having watched this video I think the problem could be a vacuum leakage... (Or am I totally mixing up things? I'm new in this mechanical world) anyway, thank you very much for your explanation!
+Armando Fregoni You're welcome. Get some data now and interpret it and you'll fix it the first time- probably without needing any parts, in fact
+Schrodinger's Box Quantum Mekanix wow God gave you a gift. what is your IQ
Dr. Seymour Butts Lol I don't have any idea what it is but not sure I believe it would be any higher than anyone else's honestly. Really I am not smart, just "enlightened".
+Schrodinger's Box Quantum Mekanix awesome job like how explain the details. ty
Dr. Seymour Butts Thanks man. Love the screen name btw lol. See ya round bro!