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This Corvette is Mean and Lean (Due to a P0171 Code). DIY Diagnosis.
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- čas přidán 1. 09. 2023
- 2008 Corvette LT2 with P0171 and P0172 codes diagnosed by a DIY.
See my video "Secret of Engine Diagnosis: Fuel Trims" for full explanation of the diagnosis in this video. studio.czcams.com/users/video5WnM...
I own a 2005 Vette and a member of a local Corvette club so I can tell you we get strange about our cars! That's a nice one for sure. I must admit the shop and the content have improved over the years. But what's important is you produce great lessons into diagnostics on every automotive video.
Thanks for sharing and of course for your many years of support!!
😏
Your videos, which I came across about 7 or 8 years ago, have saved me and my immediate family thousands of dollars over the years.
I used to buy and install parts, then cross my fingers and hope they would fix the issue I was having. Can you guess what the first 2 things I would normally replace back then were? That's right, plugs and wires. 😂
Your videos helped give me the understanding of automotive systems I needed to accurately diagnose, test, and fix problems with no guesswork.
Today, my financial situation has vastly improved. So much so that I could easily afford to pay someone else to work on my cars, but I still choose to do it myself.
While I still hate seeing the check engine illuminated, I do enjoy chasing down, finding, and fixing the problem myself.
Great story and total exemplifies the intent of the channel. It’s amazing how good self-diagnostics will help your financial situation. I can’t remember the last time I had to pay for any auto repair. At easily $500 minimum for just about any repair now, that’s a ton of money saved in itself. For most people a single auto repair can wipe them out for months.
Congratulations on the successes!!
Hi Matt, your analysis video's are amazing. I first saw your Fuel Trim video in 2022 while in Covid isolation. They were soo interesting and is now my "goto" for anything fuel trim related. Your MAF Sensor video is just as great. I wish I had seen your videos before selling my previous car that ALWAYS had a check engine light and the repair shops just played with me. never fixing it, just delaying the next light. Thank you from Perth in Western Australia.
Three months ago I didn't even know what a vacuum leak was. Now I looked at the freeze frame and thought: "well, that's probably a vacuum leak, let's see if FTs improve under load". That's one of the things (I could list many more) that your channel (and granted, my own research) accomplished, and I'm sure that many other people will agree with me. Thanks again Matt, glad to see that people recognize your virtues!
What I'm not going to thank you for are my two thrashed computer monitors that I punched while watching Eric's "tune ups" on misfiring engines, something a couple of months ago would have been my main course of action too (unsuccessfully).
Hahaha great story and yeah- once you become enlightened it is pretty hard to watch mainstream auto repair channels isnt it lol!!
Between this video and one I watched earlier of yours, I have understanding how fuel trim corrections work and why, thanks!
Awesome!! One of the best things you can learn for sure!!
Wow good find, I would have never suspected the brake booster
Pretty lucky I used that cuff device instead of going through booster like I usually do!
i can't believe i'm on the video!!! i feel so happy right now!!! this is the first channel i followed and subscribed to. It was completely mind blowin knowing there's some one out there thinking the same way i do about diagnosis, although i didn't know anything about how EFI works. The channel intro was my mantra, literally. I was just a diy and now i actually open a shop thanks to you, and now i'm starting my own channel. I wanted to make a video just for you to thank you, but it didn't have a camera till now, i'm going to make you one in these days, have uploaded to my channel for yo to see it please, i have so much to say to you. Thank you from the bottom of my heart. Lautaro
Well holy cow what a surprise hahaha!!! That sure worked out well!! Really, your comment stood out as I never forget where I am now as opposed to even 3 years ago much less 8 years ago. I think about it almost every time I walk into my garage. So to have a viewer recognize this really hit home for me. It made me feel like I’m taking you guys on the journey as well!!
Let me know when you start your channel!!!
We are in the garage with you. we all feel doing the diagnosis along with you....
I already started the channel abouth a month ago, just 1 car for now, but have some more to upload. I had some cool case studies and grab my phone to recorded it in a very rustic way. I have no idea how to use a video editor, and i will try to make the videos more acceptable for youtube, since they were recorded very quickly. I'm from Argentina, so i speak spanish, but i will do a translation for you because i think is nice to show how much my life changed viewing the diagnosis and understanding series. And thankfully the shop is going well!!!@@SchrodingersBox
Would love to see it anyway!! I have thousands of Spanish speaking viewers. Send me the link to your video- it will get put in my spam folder but I’ll look for it!!
Matt, fantastic work! I’ve been watching your videos for awhile now. You’ve always done a great job helping guys like me in gaining knowledge. Up to me to progress with knowledge. Again thank you!
Much appreciated!
That fuel trims video is the first one I watched as I was hunting around youtube looking for info on why my Pontiac had a P0171 back in 2016 or so. I found South Main Auto the same day and have been following you both since. I've learned everything I know about troubleshooting modern (newer than 96 is modern to me....) vehicle systems from you two. Also, the hummer joke cracked me up. 😆
Thanks for the info. Yes it seems most of my subs did come from that one video. It may be time to do an updated version of it.
@@SchrodingersBox i posted the comment about turbos, map and fuel trim. Im hoping you get a hold of one of those
Awesome. And how fast the long term trim reacted is what surprises me. Even in the initial throttle opening when long term dropped so quick with the vacuume leak. I thought it would take longer to drop…relearn . But I’m new to trims at 61 years as hd mechanic and enjoying this stuff. Thanks
Yes it surprised me too. Generally speaking, GM vehicles usually show LTFT reacting almost instantly. On a lot of other vehicles and especially Fords, I am used to seeing even a couple minutes for the LTFT response! This car was pretty much instant.
The large "monitor" is an awesome tool for people like me that always question the answer... NICE job!!!
Ok; good point.
Question the answer!!! NICE!!’. I am totally going to borrow that from you hahaha. wow that’s awesome, never heard that before but I love it!!
you will be hearing that in the next video for sure!!
@@SchrodingersBox it is rather what most auto technicians do. Would rather diag instead of doing what the customer wants. The supposed fix won't always fix the issue if Autozone says so with just a scan sweep.
I say to myself all the time: A good scientist is the one who question's he's method's and results all the time, but a great scientist is the one who question's himself constantly.@@SchrodingersBox
Good video. I have that same smoke machine and used it recently on my car. It showed that I had a leak at the throttle body by the throttle plate. It's a 92 Chevy Cavalier so now I have to try and find a replacement throttle body and one for an automatic equipped car.
I had to have my first Ventus machine replaced because mine had a leak in the bottom that allowed all of the fluid to leak out.
Where is that smoke machine available
Matt, I think you never did a Diesel !
I read the book. What an excellent work. clear and concise.
Thankyou.
Not yet! you are correct. I have not had the opportunity to work on one and even if I did, I know enough to know it’s a whole different animal. the only time I ever played with a diesel it had an idle problem and when I saw the MAP sensor voltage was sky high I figured the MAP was bad. it wasn’t til after I replaced it that I realized that diesels run at atmospheric pressure lol. I had no idea. and at that point I said “I’m out until I learn more”
@@SchrodingersBox
It Will be interesting watching you work on diesels.
I sent you an email inquiring about how to make a subscription to you paid channel. I want to become a member.
I had a question about the means of payment.
I would like to hear from you back.
Thankyou.
HELLO MATT AWESOME VIDEO .
Glad you enjoyed it. Great to see you again my friend!!
SAME HERE BRO.@@SchrodingersBox
You only need more light and 4K camera !!! But the contents is excellent 😊!!!
Nice diag Matt. Lovin the look and what it's attracring!
It’s funny how people seem to correlate a nice garage with being “safe” to take your car to lol. But also a lot of it is my business is a bit more established so I have some credibility. In fact the owner of this car “tested” me by bringing his wife’s car in first a few weeks ago lol. 8 years ago there is no freakin way I would a corvette like this in my garage. No way lol.
Great video My friend
Your video about fuel trims
Is the best ever video on CZcams
Thanks Ayman. I agree- it’s at least the most important lol. I have 6 pages added to fuel trims chapter so far and then once done I’ll add a few text summaries for the remaining chapters and then review and once you review and put it all together we will launch the final version!!
Great job i remember when i first started using smoke machine was always last resort now its my go to solution for vacuum leaks. i had a good one the other day would have been a great video will first chance i get send you a email about it.
Good stuff Howard- would love to hear the story!!
Nice job. Very concise and correct
Leave nothing to a guess!!
Very well explained
Thx Matt!
Anytime!!
thanks learn a lot from your videos
You are welcome!
Another great video. Not sure why I can't see the fuel trim video you referenced.
Hmmm not sure why that would be. Maybe try searching the channel for ‘fuel trims’. If there is one video on the channel to watch, that would be the one.
Hey Vicki get me a Beer !
Absolutely cool video / lesson . Sooo much information packed in . Very satisfying for my daily discipline of study . Cool that you are getting a bunch of high end vehicles… bet you can’t wait for another erotic vehicle like that Hummer ! Errr ummm I mean exotic automobile .
hahahaha erotic vehicle lol. had me for a second there lol.
👊🏼 😆
I have watched that trims video. Lol
I do like to watch a whatdunnit on a Saturday night!
it is like that isn’t it!!!
I have a 2005 Corvette Z51, and the previous owner removed the PCV valve and leave the hose open. Sometimes I have the DTC P0171 & P0174, mainly when running with E85 ethanol but even on premium gas when decelerating. I plan to put a new PCV and I wonder if it's better to plug it before of after the MAF sensor. I guess before the sensor, in order this one mesure the quantity of air coming also from the cranckcase. Otherwise this air could be considered as a vacuum leak. Am I wrong ??
There isn’t enough data to say. I don’t see a curve against load yet v
Awesome
This was a fun one. Love that car!!!
Just saw a video with a HELLCAT swapped Prowler!
I did too after that prowler video hahaha!!
@@SchrodingersBoxcan you imagine how dangerously overpowered that is?
Completely agree. In my opinion, sports cars should be build “from the ground up”. Most everyone starts with as much horsepower as possible and all this does is create low traction, break driveline components, create horrific handling and insufficient braking. In extreme cases it can even twist the vehicle frame permanently rending the vehicle undriveable.
I wish you were my PCP.👍🏻
hahahaha nice!!! Is that a Primary Car Physician lol?
Water sprays work for leak detection too at the manifold
Yes it does!! I even have a video on it!
@SchrodingersBox I was shown this at a seminar by a factory Freightliner trainer
You never said how much the smoke machine costs.. or linked where to buy it ??
Also, were do you get that inflatable bladder from?
All of these are available from Autolinepro.com!
Why did the check valve on the booster line even allow the pressurized smoke to pass through it? I feel like you almost found the leak when you shouldn't have. Seems like the check valve is allowing flow in both directions.
Yep great observation and I wondered that myself. I believe it’s because the smoke machine only puts about 1PSI output out. I validated this by blowing through the check valve and if I blow very gently I was able to blow a little bit through it but if I blow really hard through it it totally shuts off. AIR check valves on my trans am work the same way in fact- I assume from your screen name you have similar and can try it. Not sure if that’s how it’s supposed to work hahah but easily 17PSI of vacuum (colorado altitude) is sufficient draw to totally close the check valve.
you rule man, what was that book you mentioned?
You will hear about it very very soon!!!
Does anyone have a link to purchase that smoke machine?
www.autolinepro.com
That air intake seal for the smoke machine is handy. Can you buy one online ?
yes in fact you can buy it from Autoline Pro!
Your video was fun. You are so cool. Will you adopt me?
HHahaha hell why not lol. If you saw the video where we fostered 3 rescue puppies, I have to think you can’t be as challenging as that lol.
Great video! How can I purchase that smoke machine?
Go to www.autolinepro.com and find it there!!
@@SchrodingersBox Thank you!
Hey Matt !!…great videos!!…finally a Corvette but a C6…I bought a beautiful C6 2008 a few months ago with the LS3…I shut down the C5 Diag channel on CZcams and I think I’m going to name it “The Corvette Diagnostic Channel”…where do you get your intro ??…from a website or did you make it yourself ??…I’ll use your video on the Corvette Forum if anyone has the P0171/0174…I bust Corvette owners on the Forum in that they will spend thousands of dollars on dressing up their engines but will buy a $50.00 code reader and expect to diagnose their car like a pro.
hey my friend, I know all about your corvette hahaha!!! a corvette diag channel is a great idea.
I made the intro myself (both this one and the pay channel one). The intro for this channel I made using PowerPoint animations believe it or not hahaha. once I upgraded to PowerDirector I used that for the pay channel intro which is way easier. it has tons of preset animations.
if you want a professional intro, I recommend you contact Vicki’s son Alex who runs Sigilyte - www.Sigilyte.com as he does lots of original music and custom graphics.
Thanks Matt !!!…will do !!…most Corvette owners want their cars garages if you work on them OR want to there while you’re diagnosing the car…the later is the one I mostly see…LOL !!…hard to do case studies this way…they want their cars diagnosed right now !!
Can you please help me, my Chevy Cruze 1.6 gasoline engine deficulltly start in the morning, every single morning
What data do you have?
@@SchrodingersBox no check engine lights, i make it run by sprinkling some gas in the throttle body
Ok then you have either and induction metrics problem or a fuel problem for sure. What’s your fuel pressure? What’s you LTFT and STFT? What’s the MAP during cranking?
Like that smoke machine from where can I get it?
Check out www.autolinepro.com
@@SchrodingersBox : Might want to re-do the above link Matt.....
Good catch. Done!
8 inches at idle! No gasping noise?
didn’t even notice it lok
👍
ASTUTE Schrodingers Box
Enjoy your weekend with all your family around you ,Schrodingers Box
From Nick Ayivor from London England UK 🇬🇧 23:47pm
How jaded everbody is these days with 400hp. I have driven a C6 before, and it is plenty considering how skittish they can be in less than perfect conditions
This is why I'm not into that shiny stuff under the hood.
I’m not either!! I am all performance. if my performance parts have chrome, Whatevs but I don’t seek it out.